g-factor measurements at RISING: The cases of and

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Published 3 September 2010 • Europhysics Letters Association
, , Citation L. Atanasova et al 2010 EPL 91 42001 DOI 10.1209/0295-5075/91/42001

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1 Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences - BG-1784 Sofia, Bulgaria, EU

2 Physics Division, School of Science and Technology, Università di Camerino and INFN, Sezione di Perugia I-62032 Camerino (Macerata), Italy, EU

3 Weizmann Institute of Science - Rehovot 76100, Israel

4 LPSC, Université Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble F-38026 Grenoble Cedex, France, EU

5 Dipartimento di Fisica, Università di Padova and INFN, Sezione di Padova - I-35131 Padova, Italy, EU

6 GSI Helmholtzzentrum für Schwerionenforschung GmbH - Planckstr. 1, D-64291 Darmstadt, Germany, EU

7 The Henryk Niewodniczański Institute of Nuclear Physics, PAN - PL-31342 Kraków, Poland, EU

8 Dipartimento di Fisica, Università degli Studi di Milano and INFN, Sezione di Milano - I-20133 Milano, Italy, EU

9 IKP, Universität zu Köln - D-50937, Köln, Germany, EU

10 Department of Physics, University of Surrey - Guildford, GU2 7XH, UK, EU

11 Department of Physics, Lund University - S-22100 Lund, Sweden, EU

12 CSNSM, Université Paris-Sud 11, CNRS/IN2P3 - F-91405 Orsay-Campus, France, EU

13 Faculty of Physics, St. Kliment Ohridski University of Sofia - BG-1164 Sofia, Bulgaria, EU

14 Horia Hulubei National Institute of Physics and Nuclear Engineering - R-077125, Bucharest, Romania, EU

15 Instituto de Estructura de la Materia, CSIC - E-28006 Madrid, Spain, EU

16 Instituut voor Kern- en Stralingsfysica, K.U. Leuven - Celestijnenlaan 200D, B-3001 Leuven, Belgium, EU

17 IEP, Warsaw University - PL-00681 Warsaw, Poland, EU

18 Institut für Strahlenphysik, FZ Dresden-Rossendorf - D-01314, Dresden, Germany, EU

19 INFN - Laboratori Nazionali di Legnaro - I-35020 Legnaro (Padova), Italy, EU

20 Department of Physics and Centre of Mathematics for Applications, University of Oslo - N-0316 Oslo, Norway

Dates

  1. Received 6 June 2010
  2. Accepted 10 August 2010
  3. Published
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0295-5075/91/4/42001

Abstract

We report on g-factor measurements of the 19/2+ T1/2=4.5(3) μs isomer in 127Sn and the 10+ T1/2=2.69(23) μs isomer in 128Sn. These isomers were produced and spin-aligned in relativistic heavy-ion fragmentation at GSI and were selected and separated by the GSI fragment separator (FRS). The γ-rays of the isomeric decay were detected by the RISING γ-ray spectrometer. The method of time-differential perturbed angular distributions was utilized. The measured g-factors, g(19/2+; 127Sn)=− 0.17(2) and g(10+; 128Sn)=− 0.20(4), are compared with shell model calculations. The measured g-factors confirm the predominantly νh11/2− 2 and ν(s1/2− 1h11/2−2) character of the 10+ and 19/2− isomers in 128Sn and 127Sn, respectively. The results demonstrate the feasibility of the method for similar measurements in exotic neutron-rich nuclei.

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10.1209/0295-5075/91/42001