EPJ

2021 Impact factor 3.131
EPJ A - Hadrons and Nuclei
Hadrons and Nuclei
Eur. Phys. J. A 7, 463-465

On the nature of the 17 $\mu$s isomer of the 133Sb valence nucleus

J. Genevey1 - J.A. Pinston1 - H. Faust2 - C. Foin1 - S. Oberstedt2 - B. Weiss3

1 Institut des Sciences Nucléaires, IN2P3-CNRS/Université Joseph Fourier, 38026 Grenoble Cedex, France
2 Institut Laue-Langevin, 38042 Grenoble Cedex, France
3 Université de Nice, 06108 Nice, France

Received: 20 January 2000 / Revised version: 28 February 2000 Communicated by J. Äystö

Abstract
The decay of the 17 $\mu$s isomer of 133Sb was re-investigated experimentally. It was produced by thermal neutron induced fission of 241Pu. Its detection is based on time correlation between fission fragments selected by the LOHENGRIN spectrometer at ILL (Grenoble), and the $\gamma$-rays, and conversion electrons from the isomer. The interpretation of the level scheme is based on shell model calculations, where empirical two-body matrix elements were employed. The good agreement between theory and experiment suggests that the isomer is the 21/2+ member of the 2p-1h $\pi g_{7/2}\nu(f_{7/2}h_{11/2}^{-1})$ configuration.

PACS
21.10.Tg Lifetimes - 23.20.Lv Gamma transition level energies - 25.85.Ec Neutron-induced fission - 21.60.Cs Shell model - 27.60.+j $90 \le A \le 149$

Copyright Società Italiana di Fisica, Springer-Verlag 2000

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