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The neutron and proton two-particle nucleus 134Sb: New low-spin states observed in the decay of 134Sn and an estimate of the energy of the 7- isomer |
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| Authors: | A. Korgul H. Mach B. Fogelberg W. Urban W. Kurcewicz T. Rzaca-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 |
| Affiliation: | Institute of Experimental Physics, Warsaw University, ul. Ho?a 69, 00-681 Warszawa, Poland, PL Department of Radiation Science, Uppsala University, S-61182 Nyk?ping, Sweden, SE Department of Chemistry, University of Oslo, P.O. Box 1033 Blindern, N-00315 Oslo, Norway, NO Schuster Laboratory, Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK, GB Institut de Recherches Subatomiques UMR7500, CNRS-IN2P3 and Université Louis Pasteur, 67037 Strasbourg, France, FR Argonne National Laboratory, Argonne, IL 60439, USA, US Instuut voor Kern- en Stralingsfysica, Katholieke Universiteit Leuven, B-3001 Heverlee, Belgium, BE Petersburg Nuclear Physics Institute, Russian Academy of Sciences, Gatchina, 188350, Russia, RU Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. Petersburg 194021, Russia, RU Department of Physics Frescati, Royal Institute of Technology, S-10405 Stockholm, Sweden, SE Dipartimento di Scienze Fisiche, Università di Napoli Federico II and Istituto Nazionale di Fisica Nucleare, Italy, IT |
| Abstract: | Excited states in the 134Sb nucleus, populated in the β--decay of 134Sn, have been studied at the mass separator OSIRIS. The 134Sn activity was produced via fast neutron-induced fission of 238U target. A main result was the discovery of a very low-lying first-excited state of 134Sb, at 13keV, 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 208Pb region. On the basis of this comparison, the energy of the ( πg 7/2νf 7/2)7- isomer is estimated to be about 250keV, some 100keV lower than previously reported. Received: 21 March 2002 / Accepted: 16 May 2002 / Published online: 31 October 2002 RID="a" ID="a"e-mail: anovak@fuw.edu.pl |
| Keywords: | 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 |
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