An alpha-particle decay. In alpha decay, shown in Fig. 3-3, the nucleus emits a 4 He nucleus, an alpha particle. Alpha decay occurs most often in massive nuclei that have too large a proton to neutron ratio.An alpha particle, with its two protons and two neutrons, is a very stable configuration of particles.n alpha-particle decay. In alpha decay, shown in Fig. 3-3, the nucleus emits a 4 He nucleus, an alpha particle. Alpha decay occurs most often in massive nuclei that have too large a proton to neutron ratio.
gite. n. A simple, usually inexpensive rural vacation retreat especially in France. [French.
Head lice are parasitic wingless insects. They live on people's heads and feed on their blood. An adult louse is about the size of a sesame seed. The eggs, called nits, are even smaller - about the size of a knot in thread. Lice and nits are found on or near the scalp, most often at the neckline and behind the ears.