New Level Scheme and Shell Model Description of the Near-Spherical Nucleus 94Nb
PHYSICAL REVIEW C（2024）
China Inst Atom Energy
Abstract
High-spin states of Nb-94 have been studied by in-beam gamma-ray spectroscopic methods using the Se-82(O-18, p5n)Nb-94 reaction at beam energies of 82 and 88 MeV. Particle-gamma-gamma coincidence measurements using CsI and high-purity germanium arrays are employed to gain selectivity to Nb isotopic products. The level scheme of Nb-94 has been extended up to excitation energy approximate to 11 MeV and spin 24h with the addition of 20 new gamma transitions, and the placement of some of the previously known transitions has been revised. The energy spectrum bears signature of core breaking, viz., presence of high energy (E-gamma approximate to 2 MeV) gamma rays originating due to excitation of nucleons across the shell gaps. The proposed level scheme is compared with large basis spherical shell model calculations using the GWBXG and SNET interactions.
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