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Identification of \(\mathrm{\ensuremath J^{\pi} = 19/2^+}\) and \(\mathrm{\ensuremath 23/2^+}\) isomeric states in 127Sb

  • H. WatanabeEmail author
  • G. J. Lane
  • G. D. Dracoulis
  • A. P. Byrne
  • P. Nieminen
  • F. G. Kondev
  • K. Ogawa
  • M. P. Carpenter
  • R. V. F. Janssens
  • T. Lauritsen
  • D. Seweryniak
  • S. Zhu
  • P. Chowdhury
Regular Article - Experimental Physics

Abstract

The nucleus \(\ensuremath {\rm ^{127}Sb}\) , which is on the neutron-rich periphery of the \(\ensuremath \beta\) -stability region, has been populated in complex nuclear reactions involving deep-inelastic and fusion-fission processes with \(\ensuremath {\rm {}^{136}Xe}\) beams incident on thick targets. The previously known isomer at 2325 keV in \(\ensuremath {\rm {}^{127}Sb}\) has been assigned spin and parity \(\ensuremath 23/2^+\) , based on the measured \(\ensuremath \gamma\) - \(\ensuremath \gamma\) angular correlations and total internal conversion coefficients. The half-life has been determined to be 234(12) ns, somewhat longer than the value reported previously. The 2194 keV state has been assigned \(\ensuremath J^{\pi} = 19/2^+\) and identified as an isomer with \(\ensuremath T_{1/2} = 14(1) {\rm ns}\) , decaying by two \(\ensuremath E2\) branches. The observed level energies and transition strengths are compared with the predictions of a shell model calculation. Two \(\ensuremath 15/2^+\) states have been identified close in energy, and their properties are discussed in terms of mixing between vibrational and three-quasiparticle configurations.

PACS

21.10.Hw Spin, parity, and isobaric spin 21.10.Tg Lifetimes, widths 21.60.Cs Shell model 27.60.+j \(\ensuremath 90 \leq A \leq 149\) 

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Copyright information

© SIF, Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  • H. Watanabe
    • 1
    Email author
  • G. J. Lane
    • 1
  • G. D. Dracoulis
    • 1
  • A. P. Byrne
    • 1
  • P. Nieminen
    • 1
  • F. G. Kondev
    • 2
  • K. Ogawa
    • 3
  • M. P. Carpenter
    • 4
  • R. V. F. Janssens
    • 4
  • T. Lauritsen
    • 4
  • D. Seweryniak
    • 4
  • S. Zhu
    • 4
  • P. Chowdhury
    • 5
  1. 1.Department of Nuclear Physics, R.S.Phys.S.E.Australian National UniversityCanberraAustralia
  2. 2.Nuclear Engineering DivisionArgonne National LaboratoryArgonneUSA
  3. 3.RIKEN Nishina CenterWako, SaitamaJapan
  4. 4.Physics DivisionArgonne National LaboratoryArgonneUSA
  5. 5.Department of PhysicsUniversity of Massachusetts LowellLowellUSA

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