Speaker
Description
Mechanism of simultaneous non-sequential four-neutron (4$n$) emission (or "true" 4$n$-decay) has been considered in phenomenological five-body approach.
This approach is analogous to the model of the direct decay to the continuum often applied to 2$n$- and 2$p$-decays. It is demonstrated that 4$n$-decay fragments should have specific energy and angular correlations reflecting strong spatial correlations of "valence" nucleons orbiting in their 4$n$-precursors. Due to the Pauli exclusion principle, the valence neutrons are pushed to the symmetry-allowed configurations in the 4$n$-precursor structure, which causes a ``Pauli focusing'' effect.
Prospects of the observation of the Pauli focusing have been considered for
the 4n-precursor $^7$H. Fingerprints of it nuclear structure or/and decay dynamics are predicted.
