First lifetime measurement of the 9- isomer in 92Nb

Goel N.; Nag S.; Maheshwari B.; Choudhury D.; Palit R.; Malik V.; Dey P.; Laskar M.S.R.; Babra F.S.; Das B.; Kundu A.; Sindhu A.; Vazhappilly A.T.; Jadhav S.V.; Naidu B.S.

doi:https://doi.org/10.1140/epja/s10050-024-01447-8

First lifetime measurement of the 9- isomer in 92Nb

Authors

Goel N.; Nag S.; Maheshwari B.; Choudhury D.; Palit R.; Malik V.; Dey P.; Laskar M.S.R.; Babra F.S.; Das B.; Kundu A.; Sindhu A.; Vazhappilly A.T.; Jadhav S.V.; Naidu B.S.

Abstract

A new 9- isomer has been identified in odd-odd nuclide, 92Nb which was populated using the reaction 80Se(18O, p5n)92Nb at a beam energy of 99 MeV. The γ-γ coincidences were measured using Indian National Gamma Array (INGA). The previously reported isomeric state at 11- was revisited and the half-life is measured to be 103.6(32) ns. The half-life of the newly observed 9- isomer in 92Nb has been measured to be 35.8(23) ns for the first time. The transition probability B(E2) has been determined for the isomeric state. The isomeric structure has been interpreted as a four-quasiparticle excitation, consisting of three protons and one neutron, using large-scale shell model calculations. © The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2024.