is a reference mass, which is taken equal to that of a nucleon. The parameter $\gamma$ is a positive coupling constant which sets the strength of the collapse process and $\left\langle M(\mathbf{x})\right\rangle =\left\langle \phi_{t}\left|M(\mathbf{x})\right|\phi_{t}\right\rangle $, where $M({\bf x})$ is a smeared mass density operator: $$M\left(\mathbf{x}\right)=\underset{j}{\sum}m_{j}\underset{s}{\sum}\int
d\mathbf{y}g\left(\mathbf{x-y}\right)
\psi_{j}^{\dagger}\left(\mathbf{y},s\right)\psi_{j}\left(\mathbf{y},s\right),$$ $\psi_{j}^{\dagger}\left(\mathbf{y},s\right)$, $\psi_{j}\left(\mathbf{y},s\right)$ being, respectively, the creator and annihilation operators of a particle of type $j$, having mass $m_j$ and spin $s$, in the space point $\mathbf{y}$. The smearing function $g({\bf x})$ is taken equal to $$\label{eq:nnbnm}
g(\mathbf{x}) \; = \; \frac{1}{\left(\sqrt{2\pi}r_{C}\right)^{3}}\;
e^{-\mathbf{x}^{2}/2r_{C}^{2}},$$ where $r_C$ is the other new phenomenological constant of the model. Finally, $W_{t}\left(\mathbf{x}\right)$ is an ensemble of independent standard Wiener processes, one for each point in space. The standard numerical value of the correlation length $r_C$ is [@Csl]: $$r_C \; \simeq \; 10^{-5}\text{cm},$$ while, in the literature, two different values for the collapse strength $\gamma$ have been proposed. The first value has been originally proposed by Ghirardi, Pearle and Rimini [@Csl]: $$\gamma \; \simeq \; 10^{-30}\text{cm}^{3}\text{s}^{-1}$$ in analogy with the GRW model [@Grw]. The second value has been proposed by Adler, inspired by the analysis of the process of latent image formation according to collapse models, and amounts to [@adlerphoto]: $$\gamma 