Medium Spin States in the $^{87}$Se Isotope Produced in Neutron Induced Fission of $^{233}$U and $^{235}$U Targets
Résumé
The level scheme of the neutron-rich \(^{87}\)Se isotope has been extended up to 2397 keV excitation energy. The isotope of interest was produced in a neutron-induced fission reaction of a \(^{235}\)U target at the Institut Laue-Langevin in Grenoble. During the analysis, six new gamma transitions were identified by employing multifold gamma-ray coincidence relationships, measured with the FIPPS array. Based on the gamma angular correlations technique, tentative spin-parity assignments have been proposed for the low-lying levels.