New high-spin microsecond isomers in ${^{131}Sb}$

J. Genevey; J.A. Pinston; H. Faust; C. Foin; S. Oberstedt; M. Rejmund

doi:doi:10.1007/s100500070036

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2024 Impact factor 2.8

Hadrons and Nuclei

Eur. Phys. J. A 9, 191-195

New high-spin microsecond isomers in ¹³¹Sb

J. Genevey¹ - J.A. Pinston¹ - H. Faust² - C. Foin¹ - S. Oberstedt² - M. Rejmund³

¹ Institut des Sciences Nucléaires, IN2P3-CNRS/Université Joseph Fourier, F-38026, Grenoble Cedex, France
² Institut Laue-Langevin, F-38042 Grenoble Cedex, France
³ DAPNIA/SPhN, CEA Saclay, F-91191 Gif-sur-Yvette Cedex, France
genevey@isn.in2p3.fr

Received: 7 June 2000 / Revised version: 5 September 2000
Communicated by J. Äystö

Abstract
In this work we have identified and studied the decay of two new microsecond isomers 19/2^- and 23/2⁺ in ¹³¹Sb. This neutron-rich nucleus was produced by thermal neutron-induced fission of ²⁴¹Pu. The detection is based on time correlation between fission fragments selected by the LOHENGRIN spectrometer at ILL (Grenoble) and the $\gamma$ -rays or conversion electrons from isomers. These new data on high-spin states complete the level scheme previously obtained from $\beta$ -decay. A large fraction of the members of the $\pi g_{7/2} \nu (h_{11/2}^{-1} d_{3/2}^{-1})$ and $\pi g_{7/2} \nu h_{11/2}^{-2}$ multiplets are now known and were compared with a multi-particle shell model calculation.