Beta-decay energies and systematics of nuclear structure effects

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 Q/sub β/-values measured