Spectroscopic study of Mo 97 , Mo 99 , and Mo 101

Le résumé fourni par la source

Excited states of the molybdenum isotopes Mo 42 97 , 99 , 101 have been populated in two experiments which used fusion-fission and binary grazing reactions to populate yrast states of the nuclei of interest. In the first experiment, the GASP array of escape-suppressed Ge detectors was used to detect γ rays from fusion-fission products initiated by the interaction of a 230-MeV beam of S 36 ions with a thick target of Yb 176 . In the multinucleon transfer experiment, a 530-MeV beam of Zr 96 ions was incident on a thin Sn 124 target; projectile-like ejectiles were detected and identified using the PRISMA magnetic spectrometer and their associated γ rays were detected using the CLARA array of escape-suppressed Ge detectors. In Mo 99 , the previously known positive-parity ν d 5 / 2 decay sequence was extended to spin ( 25 / 2 + ) while, in Mo 101 , a similar, but hitherto unobserved ν g 7 / 2 positive-parity decay sequence was established to spin ( 27 / 2 + ). In Mo 99 and in Mo 101 , previously observed ν h 11 / 2 negative-parity decay sequences were also observed to spin 27 / 2 − . Although the observed decay sequences in Mo 97 have not been extended beyond the results of earlier work, a disagreement in the published level structure of the h 11 / 2 band has been resolved. The observed positive-parity decay sequences have been compared with the results of state-of-the-art shell-model calculations; the general features of the energy spectrum of excited states of Mo 97 ,

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