Authors
Huang, Z.; Zhang, G.; Yuan, C.; Zhang, G.; Mengoni, D.; Cai, B.; Hu, S.; Zhang, H.; Sun, H.; Valiente-Dobon, J.; Siciliano, M.
Abstract
The level scheme of 91 Mo has been studied using the GALILEO gamma-ray spectrometer at Laboratori Nazionali di Legnaro, INFN. Five transitions together with four levels are identified for the first time by the gamma-gamma coincidence measurement, considerably enriching the negative band in 91 Mo. The discrepancy in the previous parity assignments for the states higher than 3807.5 keV has been clarified with the help of new experimental results. A shell-model calculation employing the JUN45 interaction is performed in order to get a further understandingof the level structure of 91 Mo. Being close to N = 50 shell closure, the weak-coupling approximation betweenthe valence g9/2 neutron-hole with the even-even core (92 Mo) is discussed in 91 Mo.