First lifetime measurement of the isomer in Nb

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

doi:10.1140/epja/s10050-024-01447-8

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Hadrons and Nuclei

Eur. Phys. J. A (2024) 60: 234
https://doi.org/10.1140/epja/s10050-024-01447-8

Regular Article - Experimental Physics

First lifetime measurement of the $9^{-}$ $9^{-}$ isomer in $^{92}$ $^{92}$ Nb

N. Goel¹, S. Nag¹^b, B. Maheshwari², D. Choudhury³, R. Palit⁴, V. Malik⁴, P. Dey⁴, Md. S. R. Laskar⁴, F. S. Babra⁴, B. Das⁴, A. Kundu⁴, A. Sindhu⁴, Abraham T. Vazhappilly⁴, S. V. Jadhav⁴ and B. S. Naidu⁴

¹ Department of Physics, Indian Institute of Technology (BHU), Varanasi, India
² Grand Accélérateur National d’Ions Lourds, CEA/DSM-CNRS/IN2P3, B. P. 55027, F-14076, Caen Cedex, France
³ Department of Physics, Indian Institute of Technology, 140001, Ropar, India
⁴ Department of Nuclear and Atomic Physics, T. I. F. R., 400005, Mumbai, India

^b somnathn.phy@itbhu.ac.in

Received: 11 February 2024
Accepted: 1 November 2024
Published online: 27 November 2024

Abstract

A new $9^{-}$ $$9^-$$ isomer has been identified in odd-odd nuclide, $^{92}$ $^{92}$ Nb which was populated using the reaction $^{80}$ $^{80}$ Se( $^{18}$ $^{18}$ O, p5n) $^{92}$ $^{92}$ Nb at a beam energy of 99 MeV. The $γ - γ$ $\gamma -\gamma$ coincidences were measured using Indian National Gamma Array (INGA). The previously reported isomeric state at $11^{-}$ $$11^-$$ was revisited and the half-life is measured to be 103.6(32) ns. The half-life of the newly observed 9 $^{-}$ $$^- $$ isomer in $^{92}$ $^{92}$ Nb has been measured to be 35.8(23) ns for the first time. The transition probability $B (E$ $\textit{B}(\textit{E}$ 2) 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.

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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.