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

Abstract

Levels in 115Pd and 117Pd nuclei, populated in the spontaneous fission of 248Cm 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 115Pd and 117Pd instead of 5/2+ proposed in previous works. This result implicates changes of spin assignments to other levels in both nuclei.