The neutron and proton two-particle nucleus $\chem{^{134}Sb}$: New low-spin states observed in the decay of $\chem{^{134}Sn}$ and an estimate of the energy of the $\mth{7^-}$ isomer

A. Korgul; H. Mach; B. Fogelberg; W. Urban; W. Kurcewicz; T. Rząca-Urban; P. Hoff; H. Gausemel; J. Galy; J.L. Durell; W.R. Phillips; A.G. Smith; B.J. Varley; N. Schulz; I. Ahmad; L.R. Morss; M. Górska; V.I. Isakov; K.I. Erokhina; J. Blomqvist; F. Andreozzi; F. Coraggio; A. Covello; A. Gargano

doi:doi:10.1140/epja/i2001-10250-8

2021 Impact factor 3.131

Hadrons and Nuclei

Eur. Phys. J. A 15, 181-184 (2002)
DOI: 10.1140/epja/i2001-10250-8

The neutron and proton two-particle nucleus $\chem{^{134}Sb}$ : New low-spin states observed in the decay of $\chem{^{134}Sn}$ and an estimate of the energy of the $\mth{7^-}$ isomer

A. Korgul¹, H. Mach², B. Fogelberg², W. Urban¹, W. Kurcewicz¹, T. Rzaca-Urban¹, P. Hoff³, H. Gausemel³, J. Galy², J.L. Durell⁴, W.R. Phillips⁴, A.G. Smith⁴, B.J. Varley⁴, N. Schulz⁵, I. Ahmad⁶, L.R. Morss⁶, M. Górska⁷, V.I. Isakov⁸, K.I. Erokhina⁹, J. Blomqvist¹⁰, F. Andreozzi¹¹, F. Coraggio¹¹, A. Covello¹¹ and A. Gargano¹¹

¹ Institute of Experimental Physics, Warsaw University, ul. Hoza 69, 00-681 Warszawa, Poland
² Department of Radiation Science, Uppsala University, S-61182 Nyköping, Sweden
³ Department of Chemistry, University of Oslo, P.O. Box 1033 Blindern, N-00315 Oslo, Norway
⁴ Schuster Laboratory, Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK
⁵ Institut de Recherches Subatomiques UMR7500, CNRS-IN2P3 and Université Louis Pasteur, 67037 Strasbourg, France
⁶ Argonne National Laboratory, Argonne, IL 60439, USA
⁷ Instuut voor Kern- en Stralingsfysica, Katholieke Universiteit Leuven, B-3001 Heverlee, Belgium
⁸ Petersburg Nuclear Physics Institute, Russian Academy of Sciences, Gatchina, 188350, Russia
⁹ Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. Petersburg 194021, Russia
¹⁰ Department of Physics Frescati, Royal Institute of Technology, S-10405 Stockholm, Sweden
¹¹ Dipartimento di Scienze Fisiche, Università di Napoli Federico II and Istituto Nazionale di Fisica Nucleare, Italy

anovak@fuw.edu.pl

(Received 21 March 2002 / Published online: 31 October 2002)

Abstract
Excited states in the $\chem{^{134}Sb}$ nucleus, populated in the ${\beta}^-$ -decay of $\chem{^{134}Sn}$ , have been studied at the mass separator OSIRIS. The $\chem{^{134}Sn}$ activity was produced via fast neutron-induced fission of $\chem{^{238}U}$ target. A main result was the discovery of a very low-lying first-excited state of $\chem{^{134}Sb}$ , at 13 keV, which has led to a strong revision of the level scheme. The new results are compared with different theoretical calculations and with the known data for the analogous neutron and proton two-particle nucleus in the $\chem{^{208}Pb}$ region. On the basis of this comparison, the energy of the ( $\pi g_{7/2}\nu f_{7/2}$ ) _7^- isomer is estimated to be about 250 keV, some 100 keV lower than previously reported.

PACS
23.40.-s - Beta decay; double beta decay; electron and muon capture.
23.20.Lv - Gamma transitions and level energies.
21.60.Cs - Shell model.

© Società Italiana di Fisica, Springer-Verlag 2002