2019 Impact factor 2.176
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