title:
Meta-dynamical adaptive systems and their applications to a fractal
  algorithm and a biological model

abstract:
  In this article, one defines two models of adaptive systems: the
meta-dynamical adaptive system using the notion of Kalman dynamical systems and
the adaptive differential equations using the notion of variable dimension
spaces. This concept of variable dimension spaces relates the notion of spaces
to the notion of dimensions. First, a computational model of the Douady's
Rabbit fractal is obtained by using the meta-dynamical adaptive system concept.
Then, we focus on a defense-attack biological model described by our two
formalisms.


title:
Integrable discretizations of a two-dimensional Hamiltonian system with
  a quartic potential

abstract:
  In this paper, we propose integrable discretizations of a two-dimensional
Hamiltonian system with quartic potentials. Using either the method of
separation of variables or the method based on bilinear forms, we construct the
corresponding integrable mappings for the first three among four integrable
cases.


title:
Universal fractal structures in the weak interaction of solitary waves
  in generalized nonlinear Schr\"{o}dinger equations

abstract:
  Weak interactions of solitary waves in the generalized nonlinear
Schr\"{o}dinger equations are studied. It is first shown that these
interactions exhibit similar fractal dependence on initial conditions for
different nonlinearities. Then by using the Karpman-Solov'ev method, a
universal system of dynamical equations is derived for the velocities,
amplitudes, positions and phases of interacting solitary waves. These dynamical
equations contain a single parameter, which accounts for the different forms of
nonlinearity. When this parameter is zero, these dynamical equations are
integrable, and the exact analytical solutions are derived. When this parameter
is non-zero, the dynamical equations exhibit fractal structures which match
those in the original wave equations both qualitatively and quantitatively.
Thus the universal nature of fractal structures in the weak interaction of
solitary waves is analytically established. The origin of these fractal
structures is also explored. It is shown that these structures bifurcate from
the initial conditions where the solutions of the integrable dynamical
equations develop finite-time singularities. Based on this observation, an
analytical criterion for the existence and locations of fractal structures is
obtained. Lastly, these analytical results are applied to the generalized
nonlinear Schr\"{o}dinger equations with various nonlinearities such as the
saturable nonlinearity, and predictions on their weak interactions of solitary
waves are made.


title:
Discrete moving breather collisions in a Klein-Gordon chain of
  oscillators

abstract:
  We study collision processes of moving breathers with the same frequency,
traveling with opposite directions within a Klein-Gordon chain of oscillators.
Two types of collisions have been analyzed: symmetric and non-symmetric,
head-on collisions. For low enough frequency the outcome is strongly dependent
of the dynamical states of the two colliding breathers just before the
collision. For symmetric collisions, several results can be observed: breather
generation, with the formation of a trapped breather and two new moving
breathers; breather reflection; generation of two new moving breathers; and
breather fusion bringing about a trapped breather. For non-symmetric collisions
the possible results are: breather generation, with the formation of three new
moving breathers; breather fusion, originating a new moving breather; breather
trapping with also breather reflection; generation of two new moving breathers;
and two new moving breathers traveling as a ligand state. Breather annihilation
has never been observed.


title:
An efficient Fredholm method for calculation of highly excited states of
  billiards

abstract:
  A numerically efficient Fredholm formulation of the billiard problem is
presented. The standard solution in the framework of the boundary integral
method in terms of a search for roots of a secular determinant is reviewed
first. We next reformulate the singularity condition in terms of a flow in the
space of an auxiliary one-parameter family of eigenproblems and argue that the
eigenvalues and eigenfunctions are analytic functions within a certain domain.
Based on this analytic behavior we present a numerical algorithm to compute a
range of billiard eigenvalues and associated eigenvectors by only two
diagonalizations.


title: On study of nonlinear viscoelastic behavior of red blood cell membrane

abstract:
  The linear viscoelastic behavior of the red blood cell membrane of mammal and
human was studied in previous works proposing different experimental methods to
determine their viscoelastic parameters. In the present work the nonlinear
component of dynamic viscosity of the red blood cell membrane by nonlinear time
series analysis is used. For such aim, it obtained time series of test in vitro
of samples of humans and rats red blood cells using the Erythrodeformeter in
oscillating regime. The signal filtrate suppresses any linear behavior as well
as represented by a system of linear ordinary differential equations. The test
shown as much in humans as in rats resonance frequencies associated to an
attractor of unknown nature independently of excitation in the physiological
range. The preliminary studies shown that attractor could be correspond to a
complex form bull. These results allow to extend the present knowledge on
dynamic of the cellular membrane to similar stimulus which happens in the blood
circulation and it will allows to make better models of the same one.


title:
Solitary Waves Bifurcated from Bloch Band Edges in Two-dimensional
  Periodic Media

abstract:
  Solitary waves bifurcated from edges of Bloch bands in two-dimensional
periodic media are determined both analytically and numerically in the context
of a two-dimensional nonlinear Schr\"odinger equation with a periodic
potential. Using multi-scale perturbation methods, envelope equations of
solitary waves near Bloch bands are analytically derived. These envelope
equations reveal that solitary waves can bifurcate from edges of Bloch bands
under either focusing or defocusing nonlinearity, depending on the signs of
second-order dispersion coefficients at the edge points. Interestingly, at edge
points with two linearly independent Bloch modes, the envelope equations lead
to a host of solitary wave structures including reduced-symmetry solitons,
dipole-array solitons, vortex-cell solitons, and so on -- many of which have
never been reported before. It is also shown analytically that the centers of
envelope solutions can only be positioned at four possible locations at or
between potential peaks. Numerically, families of these solitary waves are
directly computed both near and far away from band edges. Near the band edges,
the numerical solutions spread over many lattice sites, and they fully agree
with the analytical solutions obtained from envelope equations. Far away from
the band edges, solitary waves are strongly localized with intensity and phase
profiles characteristic of individual families.


title: Roles of hubs in Boolean networks

abstract:
  We examined the effects of inhomogeneity on the dynamics and structural
properties using Boolean networks. Two different power-law rank outdegree
distributions were embedded to determine the role of hubs. The degree of
randomness and coherence of the binary sequence in the networks were measured
by entropy and mutual information, depending on the number of outdegrees and
types of Boolean functions for the hub. With a large number of outdegrees, the
path length from the hub reduces as well as the effects of Boolean function on
the hub are more prominent. These results indicate that the hubs play important
roles in networks' dynamics and structural properties. By comparing the effect
of the skewness of the two different power-law rank distributions, we found
that networks with more uniform distribution exhibit shorter average path
length and higher event probability of coherence but lower degree of coherence.
Networks with more skewed rank distribution have complementary properties.
These results indicate that highly connected hubs provide an effective route
for propagating their signals to the entire network.


title: A method for inferring hierarchical dynamics in stochastic processes

abstract:
  Complex systems may often be characterized by their hierarchical dynamics. In
this paper do we present a method and an operational algorithm that
automatically infer this property in a broad range of systems; discrete
stochastic processes. The main idea is to systematically explore the set of
projections from the state space of a process to smaller state spaces, and to
determine which of the projections that impose Markovian dynamics on the
coarser level. These projections, which we call Markov projections, then
constitute the hierarchical dynamics of the system. The algorithm operates on
time series or other statistics, so a priori knowledge of the intrinsic
workings of a system is not required in order to determine its hierarchical
dynamics. We illustrate the method by applying it to two simple processes; a
finite state automaton and an iterated map.


title:
A simple and direct method for generating travelling wave solutions for
  nonlinear equations

abstract:
  We propose a simple and direct method for generating travelling wave
solutions for nonlinear integrable equations. We illustrate how nontrivial
solutions for the KdV, the mKdV and the Boussinesq equations can be obtained
from simple solutions of linear equations. We describe how using this method, a
soliton solution of the KdV equation can yield soliton solutions for the mKdV
as well as the Boussinesq equations. Similarly, starting with cnoidal solutions
of the KdV equation, we can obtain the corresponding solutions for the mKdV as
well as the Boussinesq equations. Simple solutions of linear equations can also
lead to cnoidal solutions of nonlinear systems. Finally, we propose and solve
some new families of KdV equations and show how soliton solutions are also
obtained for the higher order equations of the KdV hierarchy using this method.


title: Statistical User Model for the Internet Access

abstract:
  A new statistical based model approach to characterize a user's behavior in
an Internet access link is presented. The real patterns of Internet traffic in
a heterogeneous Campus Network are studied. We find three clearly different
patterns of individual user's behavior, study their common features and group
particular users behaving alike in three clusters. This allows us to build a
probabilistic mixture model, that can explain the expected global behavior for
the three different types of users. We discuss the implications of this
emergent phenomenology in the field of multi-agent complex systems.


title:
Studying the global dynamics of conservative dynamical systems using the
  SALI chaos detection method

abstract:
  We use the Smaller ALignment Index (SALI) method of chaos detection, to study
the global dynamics of conservative dynamical systems described by differential
or difference equations. In particular, we consider the well--known 2 and
4--dimensional symplectic standard map, as well as an autonomous Hamiltonian
system of 2 and 3 degrees of freedom describing the motion of a star in models
of barred galaxies. The application of SALI helped us to compute rapidly and
accurately the percentage of regular and chaotic motion for particular values
of the parameters of these systems. We were also able to perform a
computationally efficient determination of the dependence of these percentages
on the variation of several parameters of the studied models.


title: Affinity driven social networks

abstract:
  In this work we present a model for evolving networks, where the driven force
is related to the social affinity between individuals in a population. In the
model, a set of individuals initially arranged on a regular ordered network and
thus linked with their closest neighbors are allowed to rearrange their
connections according to a dynamics closely related to that of the stable
marriage problem. We show that the behavior of some topological properties of
the resulting networks follows a non trivial pattern.


title: Cluster formation in mesoscopic systems

abstract:
  Graph-theoretical approach is used to study cluster formation in mesocsopic
systems. Appearance of these clusters are due to discrete resonances which are
presented in the form of a multigraph with labeled edges. This presentation
allows to construct all non-isomorphic clusters in a finite spectral domain and
generate corresponding dynamical systems automatically. Results of MATHEMATICA
implementation are given and two possible mechanisms of cluster destroying are
discussed.


title:
Phase transition of a one-dimensional Ising model with
  distance-dependent connections

abstract:
  The critical behavior of Ising model on a one-dimensional network, which has
long-range connections at distances $l>1$ with the probability $\Theta(l)\sim
l^{-m}$, is studied by using Monte Carlo simulations. Through studying the
Ising model on networks with different $m$ values, this paper discusses the
impact of the global correlation, which decays with the increase of $m$, on the
phase transition of the Ising model. Adding the analysis of the finite-size
scaling of the order parameter $[< M>]$, it is observed that in the whole range
of $0<m<2$, a finite-temperature transition exists, and the critical exponents
show consistence with mean-field values, which indicates a mean-field nature of
the phase transition.


title:
Group-invariant soliton equations and bi-Hamiltonian geometric curve
  flows in Riemannian symmetric spaces

abstract:
  Universal bi-Hamiltonian hierarchies of group-invariant (multicomponent)
soliton equations are derived from non-stretching geometric curve flows
$\map(t,x)$ in Riemannian symmetric spaces $M=G/H$, including compact
semisimple Lie groups $M=K$ for $G=K\times K$, $H={\rm diag} G$. The derivation
of these soliton hierarchies utilizes a moving parallel frame and connection
1-form along the curve flows, related to the Klein geometry of the Lie group
$G\supset H$ where $H$ is the local frame structure group. The soliton
equations arise in explicit form from the induced flow on the frame components
of the principal normal vector $N=\covder{x}\mapder{x}$ along each curve, and
display invariance under the equivalence subgroup in $H$ that preserves the
unit tangent vector $T=\mapder{x}$ in the framing at any point $x$ on a curve.
Their bi-Hamiltonian integrability structure is shown to be geometrically
encoded in the Cartan structure equations for torsion and curvature of the
parallel frame and its connection 1-form in the tangent space $T_\map M$ of the
curve flow. The hierarchies include group-invariant versions of sine-Gordon
(SG) and modified Korteweg-de Vries (mKdV) soliton equations that are found to
be universally given by curve flows describing non-stretching wave maps and
mKdV analogs of non-stretching Schrodinger maps on $G/H$. These results provide
a geometric interpretation and explicit bi-Hamiltonian formulation for many
known multicomponent soliton equations. Moreover, all examples of
group-invariant (multicomponent) soliton equations given by the present
geometric framework can be constructed in an explicit fashion based on Cartan's
classification of symmetric spaces.


title: A Soft Computing technique in rainfall forecasting

abstract:
  Soft Computing techniques have opened up new avenues to the forecasters of
complex systems. Atmosphere is a complex system and all the atmospheric
parameters carry different degrees of complexity within themselves. Endeavor of
the present research is to adopt Artificial Neural Network as a Soft Computing
technique to anticipate the average monsoon rainfall over India. After a
rigorous study, the said Neural Net technique has been found adroit and results
have been compared with those obtained through conventional techniques.


title:
Exact static solutions to a translationally invariant discrete $\phi^4$
  model

abstract:
  For a discrete, translationally-invariant $\phi^4$ model introduced by
Barashenkov {\it et al.} [Phys. Rev. E {\bf 72}, 35602R (2005)], we provide the
momentum conservation law and demonstrate how the first integral of the static
version of the discrete model can be constructed from a Jacobi elliptic
function (JEF) solution. The first integral can be written in the form of a
nonlinear map from which {\it any} static solution supported by the model can
be constructed. A set of JEF solutions, including the staggered ones, is
derived. We also report on the stability analysis for the static bounded
solutions and exemplify the dynamical behavior of the unstable solutions. This
work provides a road-map, through this illustrative example, on how to fully
analyze translationally-invariant models in terms of their static problem, its
first integral, their full-set of static solutions and associated conservation
laws.


title:
Asynchronism Induces Second Order Phase Transitions in Elementary
  Cellular Automata

abstract:
  Cellular automata are widely used to model natural or artificial systems.
Classically they are run with perfect synchrony, i.e., the local rule is
applied to each cell at each time step. A possible modification of the updating
scheme consists in applying the rule with a fixed probability, called the
synchrony rate. For some particular rules, varying the synchrony rate
continuously produces a qualitative change in the behaviour of the cellular
automaton. We investigate the nature of this change of behaviour using
Monte-Carlo simulations. We show that this phenomenon is a second-order phase
transition, which we characterise more specifically as belonging to the
directed percolation or to the parity conservation universality classes studied
in statistical physics.


title: Critical fronts in initiation of excitation waves

abstract:
  We consider the problem of initiation of propagating wave in a
one-dimensional excitable fiber. In the FitzHugh-Nagumo theory, the key role is
played by ``critical nucleus'' and ``critical pulse'' solutions whose
(center-)stable manifold is the threshold surface separating initial conditions
leading to propagation and those leading to decay. We present evidence that in
cardiac excitation models, this role is played by ``critical front'' solutions.


title: Two Types of Phase Synchronization Destruction

abstract:
  In this article we report that there are two different types of destruction
of the phase synchronization regime of chaotic oscillators depending on the
parameter mismatch as well as in the case of the classical synchronization of
periodic oscillators. When the parameter mismatch of the interacting chaotic
oscillators is small enough the PS breaking takes place without the destruction
of the phase coherence of chaotic attractors of oscillators. Alternatively, due
to the large frequency detuning, the PS breaking is accomplished by loss of the
phase coherence of the chaotic attractors.


title: Point-source scalar turbulence

abstract:
  The statistics of a passive scalar randomly emitted from a point source is
investigated analytically. Our attention has been focused on the two-point
equal-time scalar correlation function. The latter is indeed easily related to
the spectrum, a statistical indicator widely used both in experiments and in
numerical simulations. The only source of inhomogeneity/anisotropy is in the
injection mechanism, the advecting velocity here being statistically
homogeneous and isotropic. Our main results can be summarized as follows. 1)
For a very large velocity integral scale, a pure scaling behaviour in the
distance between the two points emerges only if their separation is much
smaller than their distance from the point source. 2) The value we have found
for the scaling exponent suggests the existence of a direct cascade, in spite
of the fact that here the forcing integral scale is formally set to zero. 3)
The combined effect of a finite inertial-range extension and of inhomogeneities
causes the emergence of subleading anisotropic corrections to the leading
isotropic term, that we have quantified and discussed.


title: The Mathematical Modelling of Inhomogeneities in Ventricular Tissue

abstract:
  Cardiac arrhythmias such as ventricular tachycardia (VT) or ventricular
fibrillation (VF) are the leading cause of death in the industrialised world.
There is a growing consensus that these arrhythmias arise because of the
formation of spiral waves of electrical activation in cardiac tissue; unbroken
spiral waves are associated with VT and broken ones with VF. Several
experimental studies have been carried out to determine the effects of
inhomogeneities in cardiac tissue on such arrhythmias. We give a brief overview
of such experiments, and then an introduction to partial-differential-equation
models for ventricular tissue. We show how different types of inhomogeneities
can be included in such models, and then discuss various numerical studies,
including our own, of the effects of these inhomogeneities on spiral-wave
dynamics. The most remarkable qualitative conclusion of our studies is that the
spiral-wave dynamics in such systems depends very sensitively on the positions
of these inhomogeneities.


title: Interactions of solitons with complex defects in Bragg gratings

abstract:
  We examine collisions of moving solitons in a fiber Bragg grating with a
triplet composed of two closely set repulsive defects of the grating and an
attractive one inserted between them. A doublet (dipole), consisting of
attractive and repulsive defects with a small distance between them,is
considered too. Systematic simulations demonstrate that the triplet provides
for superior results, as concerns the capture of a free pulse and creation of a
standing optical soliton, in comparison with recently studied traps formed by
single and paired defects, as well as the doublet: 2/3 of the energy of the
incident soliton can be captured when its velocity attains half the light speed
in the fiber (the case most relevant to the experiment), and the captured
soliton quickly relaxes to a stationary state. A subsequent collision between
another free soliton and the pinned one is examined too, demonstrating that the
impinging soliton always bounces back, while the pinned one either remainsin
the same state, or is kicked out forward, depending on the collision velocity
and phase shift between the solitons.


title:
Competition of Self-Organized Rotating Spiral Autowaves in a
  Nonequilibrium Dissipative System of Three-Level Phaser

abstract:
  We present results of cellular automata based investigations of rotating
spiral autowaves in a nonequilibrium excitable medium which models three-level
paramagnetic microwave phonon laser (phaser). The computational model is
described in arXiv:cond-mat/0410460v2 and arXiv:cond-mat/0602345v1 . We have
observed several new scenarios of self-organization, competition and dynamical
stabilization of rotating spiral autowaves under conditions of cross-relaxation
between three-level active centers. In particular, phenomena of inversion of
topological charge, as well as processes of regeneration and replication of
rotating spiral autowaves in various excitable media were revealed and
visualized for mesoscopic-scale areas of phaser-type active systems, which
model real phaser devices.


title:
Interactions of renormalized waves in thermalized Fermi-Pasta-Ulam
  chains

abstract:
  The dispersive interacting waves in Fermi-Pasta-Ulam (FPU) chains of
particles in \textit{thermal equilibrium} are studied from both statistical and
wave resonance perspectives. It is shown that, even in a strongly nonlinear
regime, the chain in thermal equilibrium can be effectively described by a
system of weakly interacting \textit{renormalized} nonlinear waves that possess
(i) the Rayleigh-Jeans distribution and (ii) zero correlations between waves,
just as noninteracting free waves would. This renormalization is achieved
through a set of canonical transformations. The renormalized linear dispersion
of these renormalized waves is obtained and shown to be in excellent agreement
with numerical experiments. Moreover, a dynamical interpretation of the
renormalization of the dispersion relation is provided via a self-consistency,
mean-field argument. It turns out that this renormalization arises mainly from
the trivial resonant wave interactions, i.e., interactions with no momentum
exchange. Furthermore, using a multiple time-scale, statistical averaging
method, we show that the interactions of near-resonant waves give rise to the
broadening of the resonance peaks in the frequency spectrum of renormalized
modes. The theoretical prediction for the resonance width for the thermalized
$\beta$-FPU chain is found to be in very good agreement with its numerically
measured value.


title: A new set of variables in the three-body problem

abstract:
  We propose a set of variables of the general three-body problem both for
two-dimensional and three-dimensional cases. Variables are
$(\lambda,\theta,\Lambda, \Theta,k,\omega)$ or equivalently
$(\lambda,\theta,L,\dot{I},k,\omega)$ for the two-dimensional problem, and
$(\lambda,\theta,L,\dot{I},k,\omega,\phi,\psi)$ for the three-dimensional
problem. Here $(\lambda,\theta)$ and $(\Lambda,\Theta)$ specifies the positions
in the shape spheres in the configuration and momentum spaces, $k$ is the
virial ratio, $L$ is the total angular momentum, $\dot{I}$ is the time
derivative of the moment of inertia, and $\omega,\phi$, and $\psi$ are the
Euler angles to bring the momentum triangle from the nominal position to a
given position. This set of variables defines a {\it shape space} of the
three-body problem. This is also used as an initial condition space. The
initial condition of the so-called free-fall three-body problem is
$(\lambda,\theta,k=0,L=0,\dot{I}=0,\omega=0)$. We show that the hyper-surface
$\dot{I} = 0$ is a global surface of section.


title:
On the propagation of social epidemics in social networks under S.I.R.
  model

abstract:
  The S.I.R. model (Susceptible, Infected, Recovered or Died) was proposed by
chemistry Willam Kermack (1927) and the mathematician G. Mc. Kendrick (1932).
the model supposes to divide to the individuals of a population in three
categories. Susceptible to be infected, Infected and Recovered (immune or died
by the disease). On the other hand has been a similarity in the evolution of
epidemics of infect aerial, the computer science propagation of virus and the
propagation of social paradigms (fashion, rumor, etc.) it calls modernly
``Social Epidemics''. In this work it is tried to use this model in different
types from social networks, real or not. In order to evaluate a meta-analysis
of results allows to investigate under wich conditions the topology of the
network is excellent and that networks are equivalent. The result obtained can
have relevance in study of propagation of epidemics of different types.


title:
Fluid-particle separation in a random flow described by the telegraph
  model

abstract:
  We study the statistics of the relative separation between two fluid
particles in a spatially smooth and temporally random flow. The Lagrangian
strain is modelled by a telegraph noise, which is a stationary random Markov
process that can only take two values with known transition probabilities. The
simplicity of the model enables us to write closed equations for the
inter-particle distance in the presence of a finite-correlated noise. In 1D, we
are able to find analytically the long-time growth rates of the distance
moments and the senior Lyapunov exponent, which consistently turns out to be
negative. We also find the exact expression for the Cram\'er function and show
that it satisfies the fluctuation relation (for the probability of positive and
negative entropy production) despite the time irreversibility of the strain
statistics. For the 2D incompressible isotropic case, we obtain the Lyapunov
exponent (positive) and the asymptotic growth rates of the moments in two
opposite limits of fast and slow strain. The quasi-deterministic limit (of slow
strain) turns out to be singular, while a perfect agreement is found with the
already-known delta-correlated case.


title: Inertial particles driven by a telegraph noise

abstract:
  We present a model for the Lagrangian dynamics of inertial particles in a
compressible flow, where fluid velocity gradients are modelled by a telegraph
noise. The model allows for an analytic investigation of the role of time
correlation of the flow in the aggregation-disorder transition of inertial
particle. The dependence on Stokes and Kubo numbers of the Lyapunov exponent of
particle trajectories reveals the presence of a region in parameter space (St,
Ku) where the leading Lyapunov exponent changes sign, thus signaling the
transition. The asymptotics of short and long-correlated flows are discussed,
as well as the fluid-tracer limit.


title:
Fluid-particle separation in the Batchelor regime with telegraph model
  of noise


title:
Exact Solutions for Equations of Bose-Fermi Mixtures in One-Dimensional
  Optical Lattice

abstract:
  We present two new families of stationary solutions for equations of
Bose-Fermi mixtures with an elliptic function potential with modulus $k$. We
also discuss particular cases when the quasiperiodic solutions become periodic
ones. In the limit of a sinusoidal potential ($k\to 0$) our solutions model a
quasi-one dimensional quantum degenerate Bose-Fermi mixture trapped in optical
lattice. In the limit $k\to 1$ the solutions are expressed by hyperbolic
function solutions (vector solitons). Thus we are able to obtain in an unified
way quasi-periodic and periodic waves, and solitons. The precise conditions for
existence of every class of solutions are derived. There are indications that
such waves and localized objects may be observed in experiments with cold
quantum degenerate gases.


title:
High-order synchronization, transitions, and competition among Arnold
  tongues in a rotator under harmonic forcing

abstract:
  We consider a rotator whose equation of motion for the angle $\theta$
consists of the zeroth and first Fourier modes. Numerical analysis based on the
trailing of saddle-node bifurcations is used to locate the n:1 Arnold tongues
where synchronization occurs. Several of them are wide enough for high-order
synchronization to be seen in passive observations. By sweeping the system
parameters within a certain range, we find that the stronger the dependence of
$\dot\theta$ on $\theta$, the wider the regions of synchronization. Use of a
synchronization index reveals a vast number of very narrow n:m Arnold tongues.
A competition phenomenon among the tongues is observed, in that they "push" and
"squeeze" one another: as some tongues widen, others narrow. Two mechanisms for
transitions between different n:m synchronization states are considered: slow
variation of the driving frequency, and the influence of low-frequency noise on
the rotator.


title:
Quasi-Patterns in a Model of Multi-Resonantly Forced Chemical
  Oscillations

abstract:
  Multi-frequency forcing of systems undergoing a Hopf bifurcation to spatially
homogeneous oscillations is investigated using a complex Ginzburg-Landau
equation that systematically captures weak forcing functions that
simultaneously hit the 1:1-, the 1:2-, and the 1:3-resonance. Weakly nonlinear
analysis shows that generically the forcing function can be tuned such that
resonant triad interactions with weakly damped modes stabilize subharmonic
quasipatterns with 4-fold and 5-fold rotational symmetry. In simulations
starting from random initial conditions domains of these quasi-patterns compete
and yield complex, slowly ordering patterns.


title: Fingering instabilities of a reactive micellar interface

abstract:
  We present an experimental study of the fingering patterns in a Hele-Shaw
cell, occurring when a gel-like material forms at the interface between aqueous
solutions of a cationic surfactant cetyltrimethylammonium bromide) and an
organic salt (salicylic acid), two solutions known to form a highly elastic
wormlike micellar fluid when mixed homogeneously. A variety of fingering
instabilities are observed, depending on the velocity of the front (the
injection rate), and on which fluid is injected into which. We have found a
regime of non-confined stationary or wavy fingers for which width selection
seems to occur without the presence of bounding walls, unlike the
Saffman-Taylor experiment. Qualitatively, some of our observations share common
mechanisms with instabilities of cooling lava flows or growing biofilms.


title: Chaos in Newtonian iterations: Searching for zeros which are not there

abstract:
  We show analytically that Newtonian iterations, when applied to a polynomial
equation, have a positive topological entropy. In a specific example of an
attempt to ``find'' the real solutions of the equation $x^2+1=0$, we show that
the Newton method is chaotic. We analytically find the invariant density and
show how this problem relates to that of a piecewise linear map.


title: On bi-hamiltonian structure of some integrable systems on so*(4)

abstract:
  We classify all the quadratic Poisson structures on $so^*(4)$ and $e^*(3)$,
which have the same foliation by symplectic leaves as the canonical Lie-Poisson
tensors. The separated variables for the some of the corresponding
bi-integrable systems are constructed.


title:
Anomalous scaling of a passive scalar advected by the turbulent velocity
  field with finite correlation time and uniaxial small-scale anisotropy

abstract:
  The influence of uniaxial small-scale anisotropy on the stability of the
scaling regimes and on the anomalous scaling of the structure functions of a
passive scalar advected by a Gaussian solenoidal velocity field with finite
correlation time is investigated by the field theoretic renormalization group
and operator product expansion within one-loop approximation. Possible scaling
regimes are found and classified in the plane of exponents $\epsilon-\eta$,
where $\epsilon$ characterizes the energy spectrum of the velocity field in the
inertial range $E\propto k^{1-2\epsilon}$, and $\eta$ is related to the
correlation time of the velocity field at the wave number $k$ which is scaled
as $k^{-2+\eta}$. It is shown that the presence of anisotropy does not disturb
the stability of the infrared fixed points of the renormalization group
equations which are directly related to the corresponding scaling regimes. The
influence of anisotropy on the anomalous scaling of the structure functions of
the passive scalar field is studied as a function of the fixed point value of
the parameter $u$ which represents the ratio of turnover time of scalar field
and velocity correlation time. It is shown that the corresponding one-loop
anomalous dimensions, which are the same (universal) for all particular models
with concrete value of $u$ in the isotropic case, are different (nonuniversal)
in the case with the presence of small-scale anisotropy and they are continuous
functions of the anisotropy parameters, as well as the parameter $u$. The
dependence of the anomalous dimensions on the anisotropy parameters of two
special limits of the general model, namely, the rapid-change model and the
frozen velocity field model, are found when $u\to \infty$ and $u\to 0$,
respectively.


title:
The effect of a cutoff on pushed and bistable fronts of the reaction
  diffusion equation

abstract:
  We give an explicit formula for the change of speed of pushed and bistable
fronts of the reaction diffusion equation when a small cutoff is applied at the
unstable or metastable equilibrium point. The results are valid for arbitrary
reaction terms and include the case of density dependent diffusion.


title: On Some Algebraic Properties of Semi-Discrete Hyperbolic Type Equations

abstract:
  Nonlinear semi-discrete equations of the form t_x(n+1)=f(t(n), t(n+1),
t_x(n)) are studied. An adequate algebraic formulation of the Darboux
integrability is discussed and the attempt to adopt this notion to the
classification of Darboux integrable chains has been undertaken.


title: Physics and Logical Openness in Cognitive Models

abstract:
  It is here proposed an analysis of symbolic and sub-symbolic models for
studying cognitive processes, centered on emergence and logical openness
notions.The Theory of Logical Openness connects the Physics of
system/environment relationships to system informational structure. In this
theory cognitive models can be ordered according to a hierarchy of complexity
depending on their logical openness degree, and their descriptive limits are
related to Godel-Turing Theorems on formal systems. The sysmbolic models with
low logical openness describe cognition by means of semantics which fix the
system/environment relationship (cognition in vitro), while the sub-symbolic
ones with high logical openness tends to seize its evolutive dynamics
(cognition in vivo. An observer is defined as a system with high logical
openness. In conclusion, the characteristic processes of intrinsic emergence
typical of bio-logic - emerging of new codes - require an alternative model to
Turing Computation, the natural or bio-morphic computation, whose essential
features we are going here to outline.


title: Turbulence transition and the edge of chaos in pipe flow

abstract:
  The linear stability of pipe flow implies that only perturbations of
sufficient strength will trigger the transition to turbulence. In order to
determine this threshold in perturbation amplitude we study the \emph{edge of
chaos} which separates perturbations that decay towards the laminar profile and
perturbations that trigger turbulence. Using the lifetime as an indicator and
methods developed in (Skufca et al, Phys. Rev. Lett. {\bf 96}, 174101 (2006))
we show that superimposed on an overall $1/\Re$-scaling predicted and studied
previously there are small, non-monotonic variations reflecting folds in the
edge of chaos. By tracing the motion in the edge we find that it is formed by
the stable manifold of a unique flow field that is dominated by a pair of
downstream vortices, asymmetrically placed towards the wall. The flow field
that generates the edge of chaos shows intrinsic chaotic dynamics.


title: r-Matrix for the restricted KdV Flows with the Neumann constraints

abstract:
  Under the Neumann constraints, each equation of the KdV hierarchy is
decomposed into two finite dimensional systems, including the well-known
Neumann model. Like in the case of the Bargmann constraint, the explicit Lax
representations are deduced from the adjoint representation of the auxiliary
spectral problem. It is shown that the Lax operator satisfies the r-matrix
relation in the Dirac bracket. Thus, the integrabilities of these resulting
systems with the Neumann constraints are obtained.


title:
Bilinearization of coupled nonlinear Schr\"odinger type equations:
  integrabilty and solitons

abstract:
  Considering the coupled envelope equations in nonlinear couplers, the
question of integrability is attempted. It is explicitly shown that Hirota's
bilinear method is one of the simple and alternative techniques to Painlev\'e
analysis to obtain the integrability conditions of the coupled nonlinear
Schr\"odinger (CNLS) type equations. We also show that the coupled Hirota
equation introduced by Tasgal and Potasek is the next hierarchy of the inverse
scattering solvable CNLS equation. The results are in agreement with the known
results.


title:
Neumann and Bargmann systems associated with an extension of the coupled
  KdV hierarchy

abstract:
  An eigenvalue problem with a reference function and the corresponding
hierarchy of nonlinear evolution equations are proposed. The bi-Hamiltonian
structure of the hierarchy is established by using the trace identity. The
isospectral problem is nonlinearized as to be finite-dimensional completely
integrable systems in Liouville sense under Neumann and Bargmann constraints.


title: New mathematical models for particle flow dynamics

abstract:
  A new class of integro-partial differential equation models is derived for
the prediction of granular flow dynamics. These models are obtained using a
novel limiting averaging method (inspired by techniques employed in the
derivation of infinite-dimensional dynamical systems models) on the Newtonian
equations of motion of a many-particle system incorporating widely used
inelastic particle-particle force formulas. By using Taylor series expansions,
these models can be approximated by a system of partial differential equations
of the Navier-Stokes type. The exact or approximate governing equations
obtained are far from simple, but they are less complicated than most of the
continuum models now being used to predict particle flow behavior. Solutions of
the new models for granular flows down inclined planes and in vibrating beds
are compared with known experimental and analytical results and good agreement
is obtained.


title: Quest for universal integrable models

abstract:
  In this paper we discuss a universal integrable model, given by a sum of two
Wess-Zumino-Witten-Novikov (WZWN) actions, corresponding to two different
orbits of the coadjoint action of a loop group on its dual, and the
Polyakov-Weigmann cocycle describing their interactions. This is an effective
action for free fermions on a torus with nontrivial boundary conditions. It is
universal in the sense that all other known integrable models can be derived as
reductions of this model. Hence our motivation is to present an unified
description of different integrable models. We present a proof of this
universal action from the action of the trivial dynamical system on the
cotangent bundles of the loop group. We also present some examples of
reductions.


title: Viewing the efficiency of chaos control

abstract:
  This paper aims to cast some new light on controlling chaos using the OGY-
and the Zero-Spectral-Radius methods. In deriving those methods we use a
generalized procedure differing from the usual ones. This procedure allows us
to conveniently treat maps to be controlled bringing the orbit to both various
saddles and to sources with both real and complex eigenvalues. We demonstrate
the procedure and the subsequent control on a variety of maps. We evaluate the
control by examining the basins of attraction of the relevant controlled
systems graphically and in some cases analytically.


title:
Energy Dependence of the Near-Threshold Total Cross-Section for the pp
  --> pp eta' Reaction

abstract:
  Total cross sections for the pp --> pp eta' reaction have been measured in
the excess energy range from Q = 1.53 MeV to Q = 23.64 MeV. The experiment has
been performed at the internal installation COSY-11 using a stochastically
cooled proton beam of the COoler SYnchrotron COSY and a hydrogen cluster
target. The determined energy dependence of the total cross section weakens the
hypothesis of the S-wave repulsive interaction between the eta' meson and the
proton. New data agree well with predictions based on the phase-space
distribution modified by the proton-proton final-state-interaction (FSI) only.


title: Similarity of multifragmentation of Au and Kr residual nucleus

abstract:
  Experimental data on multi-fragmentation of residual krypton nuclei created
in the interactions of the krypton nuclei with photoemulsion nuclei at the
energy of 0.9 GeV per nucleon are presented in a comparison with the analogous
data on fragmentation of gold residual nuclei at the energy of 10.7
GeV/nucleon. It is shown for the first time that there are two regimes of
nuclear multifragmentation: the former is when less than one-half of nucleons
of projectile nucleus are knocked out, the latter is when more than one-half of
nucleons are knocked out. Residual nuclei with closed masses created at
different reactions are fragmenting practically simultaneously when more than
one-half of nucleons of original nuclei are knocked out. The evidence of
existence of a radial flow of the spectator fragment at the decay of residual
krypton nuclei is found.


title: Magnetic Trapping of Neutrons

abstract:
  Accurate measurement of the lifetime of the neutron (which is unstable to
beta decay) is important for understanding the weak nuclear force and the
creation of matter during the Big Bang. Previous measurements of the neutron
lifetime have mainly been limited by certain systematic errors; however, these
could in principle be avoided by performing measurements on neutrons stored in
a magnetic trap. Neutral and charged particle traps are widely used tool for
studying both composite and elementary particles, because they allow long
interaction times and isolation from perturbing environments. Here we report
the magnetic trapping of neutrons. The trapping region is filled with
superfluid 4-He, which is used to load neutrons into the trap and as a
scintillator to detect their decay. Neutrons have a lifetime in the trap of 750
+330/-200 seconds, mainly limited by their beta decay rather than trap losses.
Our experiment verifies theoretical predictions regarding the loading process
and magnetic trapping of neutrons. Further refinement of this method should
lead to improved precision in the neutron lifetime measurement.


title:
Emission time scale of light particles in the system Xe+Sn at 50 AMeV. A
  probe for dynamical emission ?

abstract:
  Proton and deuteron correlation functions have been investigated with both
impact parameter and emission source selections. The correlations of the system
(129Xe + natSn) at 50 AMeV have been measured with the 4 pi INDRA which
provides a complete kinematical description of each event. The emission time
scale analyzed with a quantum model reveals the time sequence of the light
particles emitted by the projectile-like fragment. The short and constant
emission time of the proton, independent of the impact parameter, can be
attributed to a preequilibrium process.


title: Experimental search for molecular-nuclear transitions in water

abstract:
  Experimental search for molecular-nuclear transitions
H_2O\to^{18}Ne^*(4.522,1^-)\to^{18}F\to^{18}O in water molecules was carried
out. The measurements were performed in a low-background laboratory at the
Baksan Neutrino Observatory. Under the assumption that the above transitions
take place, the estimate for the half-life time of water molecule was found to
be about 10^{18} years.


title:
Measurement of Tensor Polarization in Elastic Electron-Deuteron
  Scattering at Large Momentum Transfer

abstract:
  Tensor polarization observables (t20, t21 and t22) have been measured in
elastic electron-deuteron scattering for six values of momentum transfer
between 0.66 and 1.7 (GeV/c)^2. The experiment was performed at the Jefferson
Laboratory in Hall C using the electron HMS Spectrometer, a specially designed
deuteron magnetic channel and the recoil deuteron polarimeter POLDER. The new
data determine to much larger Q^2 the deuteron charge form factors G_C and G_Q.
They are in good agreement with relativistic calculations and disagree with
pQCD predictions.


title:
Gep/Gmp for bound protons: first results for 16O with the recoil
  polarization technique

abstract:
  The first (e,e'p) polarization transfer measurements on a nucleus heavier
than deuterium have been carried out at Jefferson Laboratory. Transverse and
longitudinal components of the polarization of protons ejected in the reaction
16O(e,e'p) were measured in quasielastic perpendicular kinematics at a Q^2 of
0.8 (GeV/c)^2. The data are in good agreement with state of the art
calculations, but do not exclude possible changes in the ratio of the electric
to magnetic form factors of the nucleon in the nuclear medium at the level of
recent theoretical predictions.


title: Neutrino Detection using Lead Perchlorate

abstract:
  We discuss the possibility of using lead perchlorate as a neutrino detector.
The primary neutrino interactions are given along with some relevant properties
of the material.


title: Near-threshold eta production in the p d -> p d eta reaction

abstract:
  The total cross section of the p d -> p d eta reaction has been measured at
two energies near threshold by detecting the final proton and deuteron in a
magneti spectrometer. The values are somewhat larger than expected on the basis
of two simple theoretical estimates.


title: Spectroscopy of 13,14B via the one-neutron knockout reaction

abstract:
  The single-nucleon knockout reactions 9Be(14B, 13B + gamma)X and 197Au(14B,
13B + gamma)X, at an incident energy of 60 MeV per nucleon, have been used to
probe the structure of 14B and of the core fragment 13B. A dominant 2s
configuration is deduced for the neutron in the ground state of 14B. The
longitudinal momentum distribution for this state is consistent with "neutron
halo" structure. Spin assignments for 13B excited states at 3.48 and 3.68 MeV
are proposed based on the observed spectroscopic factors for one-neutron
removal.


title: Cross Sections for the Electron Activation of Gamma-Ray Fluorescence

abstract:
  We report cross sections for the direct excitation of gamma-ray transitions
up to 200 keV by the transient electromagnetic fields of electrons from a beam,
for incident kinetic energies of 500 keV and 5 MeV. The cross sections for the
electron activation of gamma-ray fluorescence are of the order of 300 nanobarns
for an electron incident kinetic energy of 500 keV, and are of the order of 10
microbarns for an electron incident kinetic energy of 5 MeV. The electron
excitation of nuclear transitions may lead to the development of pulsed sources
of gamma radiation of narrowly defined energy.


title:
Search for the electric dipole excitations to the $3s_{1/2} \otimes
  [2^{+}_{1} \otimes 3^{-}_{1}]$ multiplet in $^{117}$Sn

abstract:
  The odd-mass $^{117}$Sn nucleus was investigated in nuclear resonance
fluorescence experiments up to an endpoint energy of the incident photon
spectrum of 4.1 MeV at the bremsstrahlung facility of the Stuttgart University.
More than 50 mainly hitherto unknown levels were found. From the measurement of
the scattering cross sections model independent absolute electric dipole
excitation strengths were extracted. The measured angular distributions
suggested the spins of 11 excited levels. Quasi-particle phonon model
calculations including a complete configuration space were performed for the
first time for a heavy odd-mass spherical nucleus. These calculations give a
clear insight in the fragmentation and distribution of the $E1$, $M1$, and $E2$
excitation strength in the low energy region. It is proven that the $1^{-}$
component of the two-phonon $[2^{+}_{1} \otimes 3^{-}_{1}]$ quintuplet built on
top of the $1/2^{+}$ ground state is strongly fragmented. The theoretical
calculations are consistent with the experimental data.


title: Phenomenology of the Deuteron Electromagnetic Form Factors

abstract:
  A rigorous extraction of the deuteron charge form factors from tensor
polarization data in elastic electron-deuteron scattering, at given values of
the 4-momentum transfer, is presented. Then the world data for elastic
electron-deuteron scattering is used to parameterize, in three different ways,
the three electromagnetic form factors of the deuteron in the 4-momentum
transfer range 0-7 fm^-1. This procedure is made possible with the advent of
recent polarization measurements. The parameterizations allow a
phenomenological characterization of the deuteron electromagnetic structure.
They can be used to remove ambiguities in the form factors extraction from
future polarization data.


title:
Nuclear multifragmentation, percolation and the Fisher Droplet Model:
  common features of reducibility and thermal scaling

abstract:
  It is shown that the Fisher Droplet Model (FDM), percolation and nuclear
multifragmentation share the common features of reducibility (stochasticity in
multiplicity distributions) and thermal scaling (one-fragment production
probabilities are Boltzmann factors). Barriers obtained, for cluster production
on percolation lattices, from the Boltzmann factors show a power-law dependence
on cluster size with an exponent of 0.42 +- 0.02. The EOS Au multifragmentation
data yield barriers with a power-law exponent of 0.68 +- 0.03. Values of the
surface energy coefficient of a low density nuclear system are also extracted.


title: A New Measurement of the Muon Magnetic Anomaly

abstract:
  The muon magnetic anomaly may contain contributions from physics beyond the
standard model. At the Brookhaven National Laboratory (BNL) a precision
experiment aims for a measurement of the muon magnetic anomaly $a_{\mu}$ to
0.35 ppm, where conclusions about various theoretical approaches beyond
standard theory can be expected. The difference between the spin precession and
cyclotron frequencies is measured in a magnetic storage ring with highly
homogeneous field. Data taking is in progress and part of all recorded data has
been analyzed. Combining all experimental results to date yields preliminarily
$a_{\mu}(expt)=1~165~921(5) \cdot 10^{-9}$ (4 ppm) in agreement with standard
theory.


title: Statistical signatures of critical behavior in small systems

abstract:
  The cluster distributions of different systems are examined to search for
signatures of a continuous phase transition. In a system known to possess such
a phase transition, both sensitive and insensitive signatures are present;
while in systems known not to possess such a phase transition, only insensitive
signatures are present. It is shown that nuclear multifragmentation results in
cluster distributions belonging to the former category, suggesting that the
fragments are the result of a continuous phase transition.


title:
Effect of nucleon exchange on projectile multifragmentation in the
  reactions of 28Si + 112Sn and 124Sn at 30 and 50 MeV/nucleon

abstract:
  Multifragmentation of quasiprojectiles was studied in reactions of 28Si beam
with 112Sn and 124Sn targets at projectile energies 30 and 50 MeV/nucleon. The
quasiprojectile observables were reconstructed using isotopically identified
charged particles with Z_f <= 5 detected at forward angles. The nucleon
exchange between projectile and target was investigated using isospin and
excitation energy of reconstructed quasiprojectile. For events with total
reconstructed charge equal to the charge of the beam (Z_tot = 14) the influence
of beam energy and target isospin on neutron transfer was studied in detail.
Simulations employing subsequently model of deep inelastic transfer,
statistical model of multifragmentation and software replica of FAUST detector
array were carried out. A concept of deep inelastic transfer provides good
description of production of highly excited quasiprojectiles. The isospin and
excitation energy of quasiprojectile were described with good overall
agreement. The fragment multiplicity, charge and isospin were reproduced
satisfactorily. The range of contributing impact parameters was determined
using backtracing procedure.


title: Beam Energy Evolution of HBT Systematics at the AGS

abstract:
  We present preliminary results of the first pion interferometry (HBT)
excitation function at intermediate AGS energies. The beam energy evolution of
the correlations' dependence on mT, centrality, and emission angle with respect
to the reaction plane are discussed. Comparisons with predictions of the RQMD
cascade model are made.


title: New Limit for the Half-Life of 2K(2neutrino)-Capture Decay Mode of 78Kr

abstract:
  Features of data accumulated at 1817 hours in the experimental search for
2K(2 \nu)-capture decay mode of Kr-78 are discussed. The new limit for this
decay half-life is found to be T_{1/2} > 2.3 *10^{20} yr. (90% C.L.).


title:
Measurement of the vector analyzing power in elastic electron-proton
  scattering as a probe of double photon exchange amplitudes

abstract:
  We report the first measurement of the vector analyzing power in inclusive
transversely polarized elastic electron-proton scattering at Q^2 = 0.1
(GeV/c)^2 and large scattering angles. This quantity should vanish in the
single virtual photon exchange, plane wave impulse approximation for this
reaction, and can therefore provide information on double photon exchange
amplitudes for electromagnetic interactions with hadronic systems. We find a
non-zero value of A=-15.4+/-5.4 ppm. No calculations of this observable for
nuclei other than spin 0 have been carried out in these kinematics, and the
calculation using the spin orbit interaction from a charged point nucleus of
spin 0 cannot describe these data.


title:
Cross-sections of spallation residues produced in 1.A GeV 208Pb on
  proton reactions

abstract:
  Spallation residues produced in 1 GeV per nucleon $^{208}$Pb on proton
reactions have been studied using the FRagment Separator facility at GSI.
Isotopic produc- tion cross-sections of elements from $_{61}$Pm to $_{82}$Pb
have been measured down to 0.1 mb with a high accuracy. The recoil kinetic
energies of the produced fragments were also determined. The obtained
cross-sections agree with most of the few existing gamma-spectroscopy data.
Data are compared with different intra nuclear-cascade and evaporation-fission
models. Drastic deviations were found for a standard code used in technical
applications.


title: Isotopic Composition of Fragments in Nuclear Multifragmentation

abstract:
  The isotope yields of fragments, produced in the decay of the quasiprojectile
in Au+Au peripheral collisions at 35 MeV/nucleon and those coming from the
disassembly of the unique source formed in Xe+Cu central reactions at 30
MeV/nucleon, were measured. We show that the relative yields of neutron-rich
isotopes increase with the excitation energy in multifragmentation reaction. In
the framework of the statistical multifragmentation model which fairly well
reproduces the experimental observables, this behaviour can be explained by
increasing N/Z ratio of hot primary fragments, that corresponds to the
statistical evolution of the decay mechanism with the excitation energy: from a
compound-like decay to complete multifragmentation.


title: Very high rotational frequencies and band termination in 73Br

abstract:
  Rotational bands in 73Br have been investigated up to spins of 65/2 using the
EUROBALL III spectrometer. One of the negative-parity bands displays the
highest rotational frequency 1.85 MeV reported to date in nuclei with mass
number greater than 25. At high frequencies, the experimental dynamic moment of
inertia for all bands decrease to very low values, indicating a loss of
collectivity. The bands are described in the configuration-dependent cranked
Nilsson-Strutinsky model. The calculations indicate that one of the
negative-parity bands is observed up to its terminating single-particle state
at spin 63/2. This result establishes the first band termination case in the A
= 70 mass region.


title:
Background Studies for the Neutral Current Detector Array in the Sudbury
  Neutrino Observatory

abstract:
  An array of 3He-filled proportional counters will be used in the Sudbury
Neutrino Observatory to measure the neutral-current interaction of neutrinos
and deuterium. We describe the backgrounds to this detection method.


title: New results of 116Cd double beta decay study with 116CdWO4 scintillators

abstract:
  A new phase of 116Cd double beta decay experiment is in progress in the
Solotvina Underground Laboratory. Four enriched 116CdWO4 scintillators with
total mass 339 g are used in a set up, whose active shield is made of 15
natural CdWO4 crystals (20.6 kg). The background rate in the energy interval
2.5-3.2 MeV is 0.03 counts/y*kg*keV. The half-life for 2-neutrino 2-beta decay
of 116Cd is measured as T{1/2}(2-neutrino) =
[2.6+-0.1(stat)-0.4+0.7}(syst)]*10**19 y. The T{1/2} limits for neutrinoless
2-beta decay of 116Cd are set as T{1/2} >= 0.7(2.5)*10**23 y at 90%(68%) C.L.
for transition to ground state of 116Sn, while for decays to the first 2+ and
second 0+ excited levels of 116Sn as T{1/2}>=1.3(4.8)*10**22 y and
>=0.7(2.4)*10**22 y with 90%(68%) C.L., respectively. For 0-neutrino 2-beta
decay with emission of one or two Majorons, the limits are T{1/2}(0-neutrino
M1) >=3.7(5.8)*10**21 y and T{1/2}(0-neutrino M2)>=5.9(9.4)*10**20 y at
90%(68%) C.L. Restrictions on the value of the neutrino mass, right-handed
admixtures in the weak interaction, and the neutrino-Majoron coupling constant
are derived as: m(neutrino)<=2.6(1.4) eV, eta <=3.9*10**-8, lambda
<=3.4*10**-6, and g{M}<= 12(9.5)*10**-5 at 90%(68%) C.L., respectively.


title:
Quasi-free Compton Scattering from the Deuteron and Nucleon
  Polarizabilities

abstract:
  Cross sections for quasi-free Compton scattering from the deuteron were
measured for incident energies of 236--260 MeV at the laboratory angle -135
degrees. The recoil nucleons were detected in a liquid-scintillator array
situated at 20 degrees. The measured differential cross sections were used,
with the calculations of Levchuk et al., to determine the polarizabilities of
the bound nucleons. For the bound proton, the extracted values were consistent
with the accepted value for the free proton. Combining our results for the
bound neutron with those from Rose et al., we obtain one-sigma constraints of
alpha_n = 7.6-14.0 and beta_n = 1.2-7.6.


title:
Inhomogeneous isospin distribution in the reactions of 28Si + 112Sn and
  124Sn at 30 and 50 MeV/nucleon

abstract:
  We have created quasiprojectiles of varying isospin via peripheral reactions
of 28Si + 112Sn and 124Sn at 30 and 50 MeV/nucleon. The quasiprojectiles have
been reconstructed from completely isotopically identified fragments. The
difference in N/Z of the reconstructed quasiprojectiles allows the
investigation of the disassembly as a function of the isospin of the
fragmenting system. The isobaric yield ratio 3H/3He depends strongly on N/Z
ratio of quasiprojectiles. The dependences of mean fragment multiplicity and
mean N/Z ratio of the fragments on N/Z ratio of the quasiprojectile are
different for light charged particles and intermediate mass fragments.
Observation of a different N/Z ratio of light charged particles and
intermediate mass fragments is consistent with an inhomogeneous distribution of
isospin in the fragmenting system.


title:
Isospin dependence of isobaric ratio Y(3H)/Y(3He) and its relation to
  temperature

abstract:
  A dependence of the isobaric ratio Y(3H)/Y(3He) on the N/Z ratio of the
reconstructed quasiprojectile for the reaction of 28Si beam with 112,124Sn
targets at two different projectile energies 30 and 50 MeV/nucleon is
presented. We demonstrate a linear dependence of ln(Y(3H)/Y(3He)) on the
quasiprojectile N/Z ratio and show the dependence of the slope on reconstructed
excitation energy of the quasiprojectile. We relate this slope dependence at a
given excitation energy to the temperature of the fragmenting system. Using the
model assumptions of the statistical multifragmentation model, a method of
temperature determination is proposed. A caloric curve is constructed and
compared to the result of double isotope ratio method for the same set of data
and to the results of other studies.


title: Fragment Kinetic Energies and Modes of Fragment Formation

abstract:
  Kinetic energies of light fragments A <= 10 from the decay of target
spectators in 197Au 197Au collisions at 1000 MeV per nucleon have been measured
with high-resolution telescopes at backward angles. Except for protons and
apart from the observed evaporation components, the kinetic-energy spectra
exhibit slope temperatures of about 17 MeV, independent of the particle
species, but not corresponding to the thermal or chemical degrees of freedom at
breakup. It is suggested that these slope temperatures may reflect the
intrinsic Fermi motion and thus the bulk density of the spectator system at the
instant of becoming unstable.
  PACS numbers: 25.70.Pq, 21.65.+f, 25.70.Mn


title: Shape of the 8B Alpha and Neutrino Spectra

abstract:
  The beta-delayed alpha spectrum from the decay of 8B has been measured with a
setup that minimized systematic uncertainties that affected previous
measurements. Consequently the deduced neutrino spectrum presents much smaller
uncertainties than the previous recommendation. The 8B neutrino spectrum is
found to be harder than previously recommended with about (10-20)% more
neutrinos at energies between 12-14 MeV. The efficiencies of the 37Cl, 71Ga,
40Ar, and SuperKamiokande detectors are respectively, 3.6%, 1.4%, 5.7% and 1.8%
larger than previously thought.


title: Baryon Rapidity Loss in Relativistic Au+Au Collisions

abstract:
  An excitation function of proton rapidity distributions for different
centralities is reported from AGS Experiment E917 for Au+Au collisions at 6, 8,
and 10.8 GeV/nucleon. The rapidity distributions from peripheral collisions
have a valley at midrapidity which smoothly change to distributions that peak
at midrapidity for central collisions. The mean rapidity loss increases with
increasing beam energy, whereas the fraction of protons consistent with
isotropic emission from a thermal source at midrapidity decreases with
increasing beam energy.


title:
Multiple Scales in the Fine Structure of the Isoscalar Giant Quadrupole
  Resonance in ^{208}Pb

abstract:
  The fine structure of the isoscalar giant quadrupole resonance in ^{208}Pb,
observed in high-resolution (p,p') and (e,e') experiments, is studied using the
entropy index method. In a novel way, it enables to determine the number of
scales present in the spectra and their magnitude. We find intermediate scales
of fluctuations around 1.1 MeV, 460 keV and 125 keV for an excitation energy
region 0 - 12 MeV. A comparison with scales extracted from second RPA
calculations, which are in good agreement with experiment, shows that they
arise from the internal mixing of collective motion with two particle-two hole
components of the nuclear wavefunction.


title:
Measurements of Light Nuclei Production in 11.5 A GeV/c Au+Pb Heavy-Ion
  Collisions

abstract:
  We report on measurements by the E864 experiment at the BNL-AGS of the yields
of light nuclei in collisions of Au(197) with beam momentum of 11.5 A GeV/c on
targets of Pb(208) and Pt(197). The yields are reported for nuclei with baryon
number A=1 up to A=7, and typically cover a rapidity range from y(cm) to
y(cm)+1 and a transverse momentum range of approximately 0.1 < p(T)/A < 0.5
GeV/c. We calculate coalescence scale factors B(A) from which we extract model
dependent source dimensions and collective flow velocities. We also examine the
dependences of the yields on baryon number, spin, and isospin of the produced
nuclei.


title:
Semi-Inclusive Lambda and Kshort Production in p-Au Collisions at 17.5
  GeV/c

abstract:
  The first detailed measurements of the centrality dependence of strangeness
production in p-A collisions are presented. Lambda and Kshort dn/dy
distributions from 17.5 GeV/c p-Au collisions are shown as a function of "grey"
track multiplicity and the estimated number of collisions, nu, made by the
proton. The nu dependence of the Lambda yield deviates from a scaling of p-p
data by the number of participants, increasing faster than this scaling for
nu<=5 and saturating for larger nu. A slower growth in Kshort multiplicity with
nu is observed, consistent with a weaker nu dependence of K-Kbar production
than Y-K production.


title:
Probing the 6He halo structure with elastic and inelastic proton
  scattering

abstract:
  Proton elastic scattering and inelastic scattering to the first excited state
of 6He have been measured over a wide angular range using a 40.9A MeV 6He beam.
The data have been analyzed with a fully microscopic model of proton-nucleus
scattering using 6He wave functions generated from large space shell model
calculations. The inelastic scattering data show a remarkable sensitivity to
the halo structure of 6He.


title: Directed flow of antiprotons in Au+Au collisions at AGS

abstract:
  Directed flow of antiprotons is studied in Au+Au collisions at a beam
momentum of 11.5A GeV/c. It is shown that antiproton directed flow is
anti-correlated to proton flow. The measured transverse momentum dependence of
the antiproton flow is compared with predictions of the RQMD event generator.


title: UCN Upscattering rates in a molecular deuterium crystal

abstract:
  A calculation of ultra-cold neutron (UCN) upscattering rates in molecular
deuterium solids has been carried out, taking into account intra-molecular
exictations and phonons. The different moelcular species ortho-D2 (with even
rotational quantum number J) and para-D2 (with odd J) exhibit significantly
different UCN-phonon annihilation cross-sections. Para- to ortho-D2 conversion,
furthermore, couples UCN to an energy bath of excited rotational states without
mediating phonons. This anomalous upscattering mechanism restricts the UCN
lifetime to 4.6 msec in a normal-D2 solid with 33% para content.


title: Photofission of heavy nuclei at energies up to 4 GeV

abstract:
  Total photofission cross sections for 238U, 235U, 233U, 237Np, 232Th, and
natPb have been measured simultaneously, using tagged photons in the energy
range Egamma=0.17-3.84 GeV. This was the first experiment performed using the
Photon Tagging Facility in Hall B at Jefferson Lab. Our results show that the
photofission cross section for 238U relative to that for 237Np is about 80%,
implying the presence of important processes that compete with fission. We also
observe that the relative photofission cross sections do not depend strongly on
the incident photon energy over this entire energy range. If we assume that for
237Np the photofission probability is equal to unity, we observe a significant
shadowing effect starting below 1.5 GeV.


title:
Signals for a Transition from Surface to Bulk Emission in Thermal
  Multifragmentation

abstract:
  Excitation-energy-gated two-fragment correlation functions have been studied
between 2 to 9A MeV of excitation energy for equilibrium-like sources formed in
$\pi^-$ and p + $^{197}$Au reactions at beam momenta of 8,9.2 and 10.2 GeV/c.
Comparison of the data to an N-body Coulomb-trajectory code shows a decrease of
one order of magnitude in the fragment emission time in the excitation energy
interval 2-5A MeV, followed by a nearly constant breakup time at higher
excitation energy. The observed decrease in emission time is shown to be
strongly correlated with the increase of the fragment emission probability, and
the onset of thermally-induced radial expansion. This result is interpreted as
evidence consistent with a transition from surface-dominated to bulk emission
expected for spinodal decomposition.


title:
S-wave eta'-proton FSI; phenomenological analysis of near-threshold
  production of pi0, eta, and eta' mesons in proton-proton collisions

abstract:
  We describe a novel technique for comparing total cross sections for the
reactions pp --> pp pi(0), pp --> pp eta, and pp --> pp eta' close to
threshold. The initial and final state proton-proton interactions are factored
out of the total cross section, and the dependence of this reduced cross
section on the volume of phase space is discussed. Different models of the
proton-proton interaction are compared. We argue that the scattering length of
the S-wave eta'-proton interaction is of the order of 0.1 fm.


title: Interacting pion pairs in nuclear matter

abstract:
  The pion-production $\pi^+ A \to \pi^+\pi^{\pm} A'$ reactions were studied on
nuclei $^{2}H$, $^{12}C$, $^{40}Ca$ and $^{208}Pb$ at a pion energy of
$T_{\pi^{+}}$=283 MeV using the CHAOS spectrometer. The experimental results
are reduced to differential cross sections and compared to both theoretical
predictions and reaction phase space. Near the $2m_{\pi}$ threshold pion pairs
couple to $(\pi\pi)_{I=J=0}$ when produced in the $\pi^+\to \pi^+\pi^-$
reaction channel. The $\cal C$$_{\pi\pi}^A$ ratio between the
$\pi^{+}\pi^{\pm}$ invariant masses on nuclei and on the nucleon is also
presented. The marked near-threshold enhancement of $\cal C$$_{\pi^+\pi^-}^A$
is consistent with theoretical predictions addressing the partial restoration
of chiral symmetry. On the opposite, nuclear matter weakly influences $\cal
C$$_{\pi^+\pi^+}^A$.


title: Dynamics of Multifragmentation in Heavy Ion Collisions

abstract:
  We review multifragmentation data obtained at the SIS/GSI accelerator using
heavy ion beams with (0.1-1)A GeV together with the ALADIN and FOPI
experimental setups.


title:
Positron spectra from internal pair conversion observed in {238}U +
  {181}Ta collisions

abstract:
  We present new results from measurements and simulations of positron spectra,
originating from 238U + 181Ta collisions at beam energies close to the Coulomb
barrier. The measurements were performed using an improved experimental setup
at the double-Orange spectrometer of GSI. Particular emphasis is put on the
signature of positrons from Internal-Pair-Conversion (IPC) processes in the
measured e+ energy spectra, following the de-excitation of electromagnetic
transitions in the moving Ta-like nucleus. It is shown by Monte Carlo
simulations that, for the chosen current sweeping procedure used in the present
experiments, positron emission from discrete IPC transitions can lead to rather
narrow line structures in the measured energy spectra. The measured positron
spectra do not show evidence for line structures within the statistical
accuracy achieved, although expected from the intensities of the observed
$\gamma$ transitions (E$_{\gamma}~1250-1600$ keV) and theoretical conversion
coefficients. This is due to the reduced detection efficiency for IPC
positrons, caused by the limited spatial and momentum acceptance of the
spectrometer. A comparison with previous results, in which lines have been
observed, is presented and the implications are discussed.


title: Double beta decay with large scale Yb-loaded scintillators

abstract:
  The potential of large scale Yb-loaded liquid scintillators as proposed for
solar neutrino spectroscopy are investigated with respect to double beta decay.
The potential for beta-beta- - decay of 176Yb as well as the beta+/EC - decay
for 168Yb is discussed. Not only getting for the first time an experimental
half-life limit on 176Yb - decay, this will even be at least comparable or
better than existing ones from other isotopes. Also for the first time a
realistic chance to detect beta+/EC - decay exists. Effects of MeV-neutrinos
are discussed as well.


title:
Energy resolution and energy-light response of CsI(TI) scintillators for
  charged particle detection

abstract:
  This article describes the crystal selection and quality control utilized to
develop and calibrate a high resolution array of CsI(TI) scintillator crystals
for the detection of energetic charged particles. Alpha sources are used to
test the light output variation due to thallium doping gradients. Selection of
crystals with better than 1% non-uniformity in light output is accomplished
using this method. Tests with 240 MeV alpha beam reveal that local light output
variations within each of the tested CsI(TI) crystals limit the resolution to
about 0.5%. Charge and mass dependences in the energy - light output
relationship are determined by calibrating with energetic projectile
fragmentation beams.


title: Antideuteron yield at the AGS and coalescence implications

abstract:
  We present Experiment 864's measurement of invariant antideuteron yields in
11.5A GeV/c Au + Pt collisions. The analysis includes 250 million triggers
representing 14 billion 10% central interactions sampled for events with high
mass candidates. We find (1/2 pi pt) d^(2)N/dydpt = 3.5 +/- 1.5 (stat.)
+0.9,-0.5 (sys.) x 10^(-8) GeV^(-2)c^(2) for 1.8<y<2.2, <pt>=0.35 GeV/c
(y(cm)=1.6) and 3.7 +/- 2.7 (stat.) +1.4,-1.5 (sys.) x 10^(-8) GeV^(-2)c^(2)
for 1.4<y<1.8, <pt>=0.26 GeV/c, and a coalescence parameter B2-bar of 4.1 +/-
2.9 (stat.) +2.3,-2.4 (sys.) x 10^(-3) GeV^(2)c^(-3). Implications for the
coalescence model and antimatter annihilation are discussed.


title: Studies of Neutrino Oscillations at Reactors

abstract:
  Experiments with reactor neutrinos continue to shed light on our
understanding of neutrino oscillations. We review some of the early decisive
experiments. We then turn to the recent long baseline oscillation experiments
at Palo Verde and Chooz which are leading to the conclusion that the
atmospheric neutrino anomaly if attributed to oscillations does not involve an
appreciable mixing with the $\bar\nu_e$ . The very long baseline KamLAND
experiment is now in the planning stages. Its goal is to help explore the large
mixing angle solar solution. A review of the $\bar\nu_e + d$ experiment at
Bugey and an outline of the $\bar\nu_e$ magnetic moment studies complete this
chapter.


title:
The stopping of swift protons in matter and its implication for
  astrophysical fusion reactions

abstract:
  The velocity dependence of the stopping power of swift protons and deuterons
in low energy collisions is investigated. At low projectile energies the
stopping is mainly due to nuclear stopping and charge exchange of the electron.
The second mechanism dominates after Ep >=200 eV. A dynamical treatment of the
charge exchange mechanism based on two-center electronic wavefunctions yields
very transparent results for the exchange probability. We predict that the
stopping cross sections vary approximately as v to the 1.35 power for
projectile protons on hydrogen targets in the 1 keV energy region.

categories: nucl-ex astro-ph nucl-th physics.atom-ph quant-ph


title:
The Emission Pattern of High-Energy Pions: A New Probe for the Early
  Phase of Heavy Ion Collisions

abstract:
  The emission pattern of charged pions has been measured in Au+Au collisions
at 1 GeV/nucleon incident energy. In peripheral collisions and at target
rapidities, high-energy pions are emitted preferentially towards the target
spectator matter. In contrast, low-energy pions are emitted predominantly in
the opposite direction. The corresponding azimuthal anisotropy is explained by
the interaction of pions with projectile and target spectator matter. This
interaction with the spectator matter causes an effective shadowing which
varies with time during the reaction. Our observations show that high-energy
pions stem from the early stage of the collision whereas low-energy pions
freeze out later.


title: Sideward Flow in Au + Au Collisions Between 2A GeV and 8A GeV

abstract:
  Using the large acceptance Time Projection Chamber of experiment E895 at
Brookhaven, measurements of collective sideward flow in Au + Au collisions at
beam energies of 2, 4, 6 and 8A GeV are presented in the form of in-plane
transverse momentum <Px> and the first Fourier coefficient of azimuthal
anisotropy v_1. These measurements indicate a smooth variation of sideward flow
as a function of beam energy. The data are compared with four nuclear transport
models which have an orientation towards this energy range. All four exhibit
some qualitative trends similar to those found in the data, although none shows
a consistent pattern of agreement within experimental uncertainties.


title:
Backward emitted high-energy neutrons in hard reactions of p and pi^+ on
  carbon

abstract:
  Beams of protons and pions of 5.9 GeV/c were incident on a C target. Neutrons
emitted into the back hemisphere, in the laboratory system, were detected in
(triple) coincidence with two emerging $p_t>$0.6 GeV/c particles. We present
the momentum spectra of the backward going neutrons, which have the same
universal shape observed in earlier (inclusive) reactions induced by hadrons,
$\gamma$, $\nu$, and $\bar{\nu}$ beams. We also integrated the spectra and
determined the fraction of the hard scattering events which are in coincidence
with at least one neutron emitted into the back hemisphere, with momenta above
0.32 GeV/c.
  Contrary to the earlier measurements which found that only a small fraction
(of the order of 10%) of the total inelastic cross section for light nuclei was
associated with backward going nucleons, we find that about half of the events
are of this nature. We speculate that the reason for the large difference is
the strong total center of mass (s) dependence of the hard reaction and short
range nucleon correlations in nuclei.


title: New Limit on the D Coefficient in Polarized Neutron Decay

abstract:
  We describe an experiment that has set new limits on the time reversal
invariance violating D coefficient in neutron beta-decay. The emiT experiment
measured the angular correlation J . p_e x p_p using an octagonal symmetry that
optimizes electron-proton coincidence rates. The result is
D=[-0.6+/-1.2(stat)+/-0.5(syst)]x10^(-3). This improves constraints on the
phase of g_A/g_V and limits contributions to T violation due to leptoquarks.
This paper presents details of the experiment, data analysis, and the
investigation of systematic effects.


title:
New Measurement of Parity Violation in Elastic Electron-Proton
  Scattering and Implications for Strange Form Factors

abstract:
  We have measured the parity-violating electroweak asymmetry in the elastic
scattering of polarized electrons from the proton. The result is A = -15.05 +-
0.98(stat) +- 0.56(syst) ppm at the kinematic point theta_lab = 12.3 degrees
and Q^2 = 0.477 (GeV/c)^2. The measurement implies that the value for the
strange form factor (G_E^s + 0.392 G_M^s) = 0.025 +- 0.020 +- 0.014, where the
first error is experimental and the second arises from the uncertainties in
electromagnetic form factors. This measurement is the first fixed-target parity
violation experiment that used either a `strained' GaAs photocathode to produce
highly polarized electrons or a Compton polarimeter to continuously monitor the
electron beam polarization.


title: The Halo of 14Be

abstract:
  The two-neutron halo nucleus 14Be has been investigated in a kinematically
complete measurement of the fragments (12Be and neutrons) produced in
dissociation at 35 MeV/nucleon on C and Pb targets. Two-neutron removal
cross-sections, neutron angular distributions and invariant mass spectra
characteristic of a halo were observed and the electromagnetic (EMD)
contributions deduced. Comparison with three-body model predictions indicate
that the halo wavefunction contains a large 2s1/2^2 admixture. The EMD
invariant mass spectrum exhibited a relatively narrow structure near threshold
(Edecay=1.8+/-0.1 MeV, Gamma = 0.8+/-0.4 MeV) consistent with a soft-dipole
excitation.


title: Sideward flow of K+ mesons in Ru+Ru and Ni+Ni reactions near threshold

abstract:
  Experimental data on K+ meson and proton sideward flow measured with the FOPI
detector at SIS/GSI in the reactions Ru+Ru at 1.69 AGeV and Ni+Ni at 1.93 AGeV
are presented. The K+ sideward flow is found to be anti-correlated (correlated)
with the one of protons at low (high) transverse momenta. When compared to the
predictions of a transport model, the data favour the existence of an in-medium
repulsive K+ nucleon potential.


title:
A Measurement of Gamow-Teller Strength for 176Yb -> 176Lu and the
  Efficiency of a Solar Neutrino Detector

abstract:
  We report a 0-degree 176Yb(p,n)176Lu measurement at IUCF where we used 120
and 160 MeV protons and the energy dependence method to determine GT matrix
elements relative to the Fermi matrix element which can be calculated model
independently. The data show that there is an isolated concentration of GT
strength in the low lying 1+ states making the proposed Low Energy Neutrino
Spectroscopy (LENS) detector (based on neutrino captures on 176Yb) sensitive to
7Be and pp neutrinos and a promising detector to resolve the solar neutrino
problem.


title:
Gamow-Teller Strengths of the Inverse-Beta Transition 176Yb --> 176Lu
  for Spectroscopy of Proton-Proton and other sub-MeV Solar Neutrinos

abstract:
  Discrete Gamow-Teller (GT) transitions, 176Yb-->176Lu at low excitation
energies have been measured via the (3He,t) reaction at 450 MeV and at 0
degrees. For 176Yb, two low-lying states are observed, setting low thresholds
Q(neutrino)=301 and 445 keV for neutrino capture. Capture rates estimated from
the measured GT strengths, the simple two-state excitation structure, and the
low Q(neutrino) in Yb--Lu indicate that Yb-based neutrino-detectors are well
suited for a direct measurement of the complete sub-MeV solar electron-neutrino
spectrum (including pp neutrinos) where definitive effects of flavor conversion
are expected.


title: Direct Photon Production in 158 A GeV 208Pb + 208Pb collisions

abstract:
  A measurement of direct photon production in 208Pb + 208Pb collisions at 158
A GeV has been carried out in the CERN WA98 experiment. The invariant yield or
upper limit of direct photons as a function of transverse momentum in the
interval 0.5 < p_T < 4 GeV/c is presented. A significant direct photon excess
is observed at p_T > 1.5 GeV/c in central collisions. The results are compared
to proton-induced results and to theoretical predictions. Implications for the
dynamics of high-energy heavy-ion collisions are discussed.


title:
Observation of Direct Photons in Central 158 A GeV 208Pb+208Pb
  Collisions

abstract:
  A measurement of direct photon production in 208Pb + 208Pb collisions at 158
A GeV has been carried out in the CERN WA98 experiment. The invariant yield of
direct photons in central collisions is extracted as a function of transverse
momentum in the interval 0.5 < p_T < 4 GeV/c. A significant direct photon
signal, compared to statistical and systematical errors, is seen at p_T > 1.5
GeV/c. The results constitute the first observation of direct photons in
ultrarelativistic heavy-ion collisions which could be significant for diagnosis
of quark gluon plasma formation.


title: On the reliability of the theoretical internal conversion coefficients

abstract:
  Possible sources of uncertainties in the calculations of the internal
conversion coefficients are studied. The uncertainties induced by them are
estimated.


title: Creation and decay of eta-mesic nuclei

abstract:
  First experimental results on photoproduction of eta-mesic nuclei are
analyzed. In an experiment performed at the 1 GeV electron synchrotron of the
Lebedev Physical Institute, correlated pi+n pairs arising from the reaction
gamma + 12C -> N + eta(A-1) -> N + pi+ + n + (A-2) and flying transversely to
the photon beam have been observed. When the photon energy exceeds the
eta-meson production threshold, a distribution of the pi+n pairs over their
total energy is found to have a peak in the subthreshold region of the
internal-conversion process eta p -> pi+ n which signals about formation of
eta-mesic nuclei.


title: Crossing the Dripline to 11N Using Elastic Resonance Scattering

abstract:
  The level structure of the unbound nucleus 11N has been studied by 10C+p
elastic resonance scattering in inverse geometry with the LISE3 spectrometer at
GANIL, using a 10C beam with an energy of 9.0 MeV/u. An additional measurement
was done at the A1200 spectrometer at MSU. The excitation function above the
10C+p threshold has been determined up to 5 MeV. A potential-model analysis
revealed three resonance states at energies 1.27 (+0.18-0.05) MeV (Gamma=1.44
+-0.2 MeV), 2.01(+0.15-0.05) MeV, (Gamma=0.84 +-$0.2 MeV) and 3.75(+-0.05) MeV,
(Gamma=0.60 +-0.05 MeV) with the spin-parity assignments I(pi) =1/2+, 1/2- and
5/2+, respectively. Hence, 11N is shown to have a ground state parity inversion
completely analogous to its mirror partner, 11Be. A narrow resonance in the
excitation function at 4.33 (+-0.05) MeV was also observed and assigned
spin-parity 3/2-.


title:
Discovery of Long-Lived Shape Isomeric States which Decay by Strongly
  Retarded High-Energy Particle Radioactivity

abstract:
  The reaction 28Si + 181Ta has been studied at E(Lab) = 125 and 135 MeV.
Coincidences between high energy particles and various X- and gamma-rays from
abnormally long-lived states were observed. e.g. 7.8 - 8.6 MeV alpha-particles
with gamma-rays of a superdeformed band, 5.1 - 5.5 MeV alpha-particles with X-
and gamma-rays of W, Re, and Pt, and 3.88 MeV particles (interpreted as
protons) with 185.8 keV gamma-rays. The data are interpreted in terms of the
production of long-lived (t(1/2) of several months) high spin isomeric states
in the second well of the potential in the parent nuclei, which decay to the
normal states in the daughters, and in the third well of the potential, which
decay to the second well.


title:
Strongly Enhanced Low Energy Alpha-Particle Decay in Heavy Actinide
  Nuclei and Long-Lived Superdeformed and Hyperdeformed Isomeric States

abstract:
  Relatively low energy and very enhanced alpha-particle groups have been
observed in various actinide fractions produced via secondary reactions in a
CERN W target which had been irradiated with 24-GeV protons. In particular,
5.14, 5.27 and 5.53 MeV alpha-particle groups with corresponding half-lives of
3.8(+ -)1.0 y, 625(+ -)84 d and 26(+ -)7 d, have been seen in Bk, Es and Lr-No
sources, respectively. The measured energies are a few MeV lower than the known
g.s. to g.s. alpha-decays in the corresponding neutron-deficient actinide
nuclei. The half-lives are 4 to 7 orders of magnitude shorter than expected
from the systematics of alpha-particle decay in this region of nuclei. The
deduced evaporation residue cross sections are in the mb region, about 4 orders
of magnitude higher than expected. A consistent interpretation of the data is
given in terms of production of long-lived isomeric states in the second and
third wells of the potential-energy surfaces of the parent nuclei, which decay
to the corresponding wells in the daughters. The possibility that the isomeric
states in the third minimum are actually the true or very near the true ground
states of the nuclei, and consequences regarding the production of the
long-lived superheavy elements, are discussed.


title:
Abnormal Radioactive Decays out of Long-Lived Super- and Hyper-Deformed
  Isomeric States

abstract:
  Long-lived high-spin super- and hyper-deformed isomeric states, which exhibit
themselves by abnormal radioactive decays, have been observed using the 16O +
197Au and 28Si + 181Ta reactions. They make it possible to understand the
production, via secondary reactions, of the long-lived superheavy element with
Z = 112 and of the abnormally low energy and very enhanced alpha-particle
groups seen in various actinide sources. They might also explain some puzzling
phenomena seen in nature.


title: Heavy Meson Production at COSY - 11

abstract:
  The COSY-11 collaboration has measured the total cross section for the pp -->
pp eta-prime and pp --> pp eta reactions in the excess energy range from
  Q = 1.5 MeV to Q = 23.6 MeV and from Q = 0.5 MeV to Q = 5.4 MeV,
respectively.
  Measurements have been performed with the total luminosity of 73 nb^(-1) for
the pp --> pp eta reaction and 1360 nb^(-1) for the pp --> pp eta-prime one.
Recent results are presented and discussed.


title:
Experimental simulation of a stellar photon bath by bremsstrahlung: the
  astrophysical $\gamma$-process

abstract:
  The nucleosynthesis of heavy proton-rich nuclei in a stellar photon bath at
temperatures of the astrophysical $\gamma$-process was investigated where the
photon bath was simulated by the superposition of bremsstrahlung spectra with
different endpoint energies. The method was applied to derive ($\gamma$,n)
cross sections and reaction rates for several platinum isotopes.


title: Incipient magnetic rotation? A magnetic dipole band in 104Cd

abstract:
  High spin states of the nucleus 104Cd have been studied using the Gammapshere
array. The level scheme for 104Cd has been revised and evidence for a structure
consisting of magnetic dipole transitions is presented. Shell model
calculations, published previously, are invoked to support an interpretation of
this structure as an incpient case of magnetic rotation where the transversal
magnetic dipole moment is not strong enough to break the signature symmetry.


title:
Thermal hard-photons probing multifragmentation in nuclear collisions
  around the Fermi energy

abstract:
  Hard-photon (E$_{\gamma} >$ 30 MeV) emission issuing from proton-neutron
bremsstrahlung collisions is investigated in four different heavy-ion reactions
at intermediate bombarding energies ($^{36}$Ar+$^{197}$Au, $^{107}$Ag,
$^{58}$Ni, $^{12}$C at 60{\it A} MeV) coupling the TAPS photon spectrometer
with two charged-particle multidetectors covering more than 80% of the solid
angle. The hard-photon spectra of the three heavier targets result from the
combination of two distinct exponential distributions with different slope
parameters, a result which deviates from the behaviour expected for hard-photon
production just in first-chance proton-neutron collisions. The thermal origin
of the steeper bremsstrahlung component is confirmed by the characteristics of
its slope and angular distribution. Such thermal hard-photons convey
undisturbed information of the thermodynamical state of hot and excited nuclear
systems undergoing multifragmentation.


title:
Thermal bremsstrahlung probing the thermodynamical state of
  multifragmenting systems

abstract:
  Inclusive and exclusive hard-photon (E$_\gamma >$ 30 MeV) production in five
different heavy-ion reactions ($^{36}$Ar+$^{197}$Au, $^{107}$Ag, $^{58}$Ni,
$^{12}$C at 60{\it A} MeV and $^{129}$Xe+$^{120}$Sn at 50{\it A} MeV) has been
studied coupling the TAPS photon spectrometer with several charged-particle
multidetectors covering more than 80% of 4$\pi$. The measured spectra, slope
parameters and source velocities as well as their target-dependence, confirm
the existence of thermal bremsstrahlung emission from secondary nucleon-nucleon
collisions that accounts for roughly 20% of the total hard-photon yield. The
thermal slopes are a direct measure of the temperature of the excited nuclear
systems produced during the reaction.


title: Lambda Production and Flow in Au+Au Collisions at 11.5A GeV/c

abstract:
  New data on Lambda production in Au+Au collisions at 11.5 A GeV/c are
presented. The measurements cover the rapidity range from y=2.0 to 3.5 and
transverse momenta from pt=0.15 GeV/c to 1.5 GeV/c. The rapidity distributions,
transverse momentum spectra, and azimuthal distributions are presented for
different centralities of the collision. A strong positive directed flow at
forward rapidity is observed for semicentral collisions. The measured spectra,
yields and directed flow are compared with the predictions of RQMD v2.3 model.


title:
Properties of Some Resonances of the 55Mn(p,g)56Fe Reaction in the Ep =
  1.3 - 1.8 Mev Region

abstract:
  Radiative decay of 21 resonances in the 55Mn(p,g)56Fe reaction was studied in
the proton beam energy region Ep = 1.3 - 1.8 MeV. Branching of decay to many
low lying bound states up to excitation energy Ex ~ 8 MeV was measured. Exact
energy of all resonances has been established what pointed out that five of the
resonances are very close doublets. For all studied resonances were determined
their spin-parity charakteristics. Assignment of some resonances as isobaric
analogues of the states in the 56Mn nucleus was discused and short note about
energy systematics of isobaric analogue resonances was shown.


title: Level density and thermal properties in rare earth nuclei

abstract:
  A convergent method to extract the nuclear level density and the gamma-ray
strength function from primary gamma-ray spectra has been established.
Thermodynamical quantities have been obtained within the microcanonical and
canonical ensemble theory. Structures in the caloric curve and in the heat
capacity curve are interpreted as fingerprints of breaking of Cooper pairs and
quenching of pairing correlations. The strength function can be described using
models and common parameterizations for the E1, M1 and pygmy resonance
strength. However, a significant decrease of the pygmy resonance strength at
finite temperatures has been observed.


title:
Structure of isobaric analog states in 91Nb populated by the 90Zr(a,t)
  reaction

abstract:
  Decay via proton emission of isobaric analog states (IAS's) in $^{91}{Nb}$
was studied using the $^{90}{Zr}(\alpha,t)$ reaction at $E_\alpha$=180 MeV.
This study provides information about the damping mechanism of these states.
Decay to the ground state and low-lying phonon states in $^{90}{Zr}$ was
observed. The experimental data are compared with theoretical predictions
wherein the IAS `single-particle' proton escape widths are calculated in a
continuum RPA approach. The branching ratios for decay to the phonon states are
explained using a simple model.


title: The $(\pi^-,\gamma\gamma)$ program at TRIUMF

abstract:
  We report the first observation of the doubly-radiative decay mode of pionic
hydrogen (pi- p --> gamma gamma n) and and deuterium (pi- d --> gamma gamma X)
using the RMC pair spectrometer at TRIUMF. The process is interesting in the
context of the pi-Compton scattering and the chiPT predictions of the pion
polarizability We present our preliminary values for the B.R.(pi- p --> gamma
gamma n)=3.8x10^-5 and B.R.(pi- d --> gamma gamma X)=1.6x10^-5. Our pi- p data
indicates the dominance of pi pi --> gamma gamma mechanism. The pi- d data
shows no evidence for the d1* dibaryon.


title:
High sensitivity double beta decay study of 116-Cd and 100-Mo with the
  BOREXINO Counting Test Facility (CAMEO project)

abstract:
  The unique features (super-low background and large sensitive volume) of the
CTF and BOREXINO set ups are used in the CAMEO project for a high sensitivity
study of 100-Mo and 116-Cd neutrinoless double beta decay. Pilot measurements
with 116-Cd and Monte Carlo simulations show that the sensitivity of the CAMEO
experiment (in terms of the half-life limit for neutrinoless double beta decay)
is (3-5) 10^24 yr with a 1 kg source of 100-Mo (116-Cd, 82-Se, and 150-Nd) and
about 10^26 yr with 65 kg of enriched 116-CdWO_4 crystals placed in the liquid
scintillator of the CTF. The last value corresponds to a limit on the neutrino
mass of less than 0.06 eV. Similarly with 1000 kg of 116-CdWO_4 crystals
located in the BOREXINO apparatus the neutrino mass limit can be pushed down to
m_nu<0.02 eV.


title: One-neutron removal reactions on neutron-rich psd-shell nuclei

abstract:
  A systematic study of high energy, one-neutron removal reactions on 23
neutron-rich, psd--shell nuclei (Z=5-9, A=12-25) has been carried out. The
longitudinal momentum distributions of the core fragments and corresponding
single-neutron removal cross sections are reported for reactions on a carbon
target. Extended Glauber model calculations, weighted by the spectroscopic
factors obtained from shell model calculations, are compared to the
experimental results. Conclusions are drawn regarding the use of such reactions
as a spectroscopic tool and spin-parity assignments are proposed for 15B, 17C,
19-21N, 21,23O, 23-25F. The nature of the weakly bound systems 14B and 15,17C
is discussed.