Beta-decay energies and systematics of nuclear structure effects

Abstract

A systematic study of the beta‐decay energies of very neutron‐rich fission products in the mass regions 85≤A≤109 and 130≤A≤150 has been performed in recent years at the mass separators LOHENGRIN and OSTIS at Grenoble, France. From the experimental values of these decay energies—or of binding energies derived from them—it is possible to investigate systematics of nuclear structure effects as a function of mass number A, proton number Z or neutron number N. Several such effects have been observed in the mass regions around A=100 and A=145, namely subshell closures at Z=40 (38) and N=56, and deformations for nuclei with plots of the two‐neutron and two‐proton separation energies calculated from the Qβ‐values measured.