New spins for ground states and isomers in Pd-115 and Pd-117

摘要

Levels in Pd-115 and Pd-117 nuclei, populated in the spontaneous fission Of Cm-248 were studied by means of prompt gamma spectroscopy using the EUROGAM2 array of Anti-Compton spectrometers. Negative-parity, I = 9/2 excitations were identified, which are associated with the long-lived isomers in these nuclei, reported previously as 11/2(-) excitations. The new data indicate spin and parity 3/2(+) for ground states in Pd-115 and Pd-117 instead of 5/2(+) proposed in previous works. This result implicates changes of spin assignments. to other levels in both nuclei.