g-factor Measurements at RISING: The Cases of 127Sn and 128Sn

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We report on g-factor measurements of the 19/2(+) T-1/2 = 4.5(3) mu s isomer in Sn-127 and the 10(+) T-1/2 = 2.69(23) mu s isomer in Sn-128. 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 gamma-rays of the isomeric decay were detected by the RISING gamma-ray spectrometer. The method of time-differential perturbed angular distributions was utilized. The measured g-factors, g(19/2(+); Sn-127) =-0.17(2) and g(10(+); Sn-128)=-0.20(4), are compared with shell model calculations. The measured g-factors confirm the predominantly nu h(11/2)(-2) and nu(s(1/2)(-1) h(11/2)(-2)) character of the 10(+) and 19/2(-) isomers in Sn-128 and Sn-127, respectively. The results demonstrate the feasibility of the method for similar measurements in exotic neutron-rich nuclei. Copyright (C) EPLA, 2010


  • L. Atanasova
  • D. L. Balabanski
  • S. K. Chamoli
  • M. Hass
  • G. S. Simpson
  • D. Bazzacco
  • F. Becker
  • P. Bednarczyk
  • G. Benzoni
  • N. Blasi
  • A. Blazhev
  • A. Bracco
  • C. Brandau
  • L. Caceres
  • F. Camera
  • F. C. L. Crespi
  • P. Detistov
  • P. Doornenbal
  • E. Farnea
  • G. Georgiev
  • J. Gerl
  • K. A. Gladnishki
  • M. Gorska
  • J. Grebosz
  • Robert Hoischen
  • G. Ilie
  • M. Ionescu-Bujor
  • A. Iordachescu
  • A. Jungclaus
  • G. Lo Bianco
  • M. Kmiecik
  • I. Kojouharov
  • N. Kurz
  • S. Lakshmi
  • R. Lozeva
  • A. Maj
  • D. Montanari
  • G. Neyens
  • M. Pfuetzner
  • S. Pietri
  • Zs. Podolyak
  • W. Prokopowicz
  • G. Rusev
  • T. R. Saito
  • A. Saltarelli
  • H. Schaffner
  • R. Schwengner
  • S. Tashenov
  • J. J. Valiente-Dobon
  • N. Vermeulen
  • J. Walker
  • E. Werner-Malento
  • O. Wieland
  • H. J. Wollersheim
  • H. Grawe
  • M. Hjorth-Jensen
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Physical Sciences
Original languageEnglish
Article number42001
JournalEurophysics Letters
Issue number4
Publication statusPublished - 2010
Publication categoryResearch