Kinetic energy dependence of fission fragment isomeric ratios for spherical nuclei 132Sn

Abstract Isomeric ratios are a powerful observable to investigate fission fragment total angular momenta. A recent experimental campaign achieved at the LOHENGRIN spectrometer, shows a kinetic energy dependence of μ s isomeric ratios from fission fragments populated in neutron induced fission of 235 U. For the first time, this dependence was measured for the isomeric ratio of the doubly magic 132 Sn. A Bayesian assessment of the angular momentum distribution of 132 Sn is proposed according to calculations performed with the FIFRELIN code and interpreted with spin generation models.