High-spin states beyond the proton dripline: quasiparticle alignments in 113 Cs

P.t. Wady, J.f. Smith, B. Hadinia, D.m. Cullen, S.j. Freeman, I.g. Darby, S. Eeckhaudt, T. Grahn, P.t. Greenlees, P.m. Jones, R. Julin, S. Juutinen, H. Kettunen, M. Leino, A.-p. Leppänen, B.m. Mcguirk, P. Nieminen, M. Nyman, R.d. Page, J. PakarinenE.s. Paul, P. Rahkila, S.v. Rigby, C. Scholey, J. Uusitalo, R. Wadsworth

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4 Citations (Scopus)


Excited states have been studied in the deformed proton emitter 113Cs. Gamma-ray transitions have been unambiguously assigned to 113Cs by correlation with its characteristic proton decay, using the method of recoil-decay tagging. Two previously identified rotational bands have been observed and extended to tentative spins of 45/2and 51/2 ̄h, with excitation energies over 8 MeV above the lowest state. These are the highest angular momenta and excitation energies observed to date in any nucleus beyond the proton drip-line. Transitions in the bands have been rearranged compared to previous work. A study of aligned angular momenta, in comparison to the predictions of Woods–Saxon cranking calculations, is consistent with the most intense band being based on the πg7/2[422]3/2+configuration, which would contradict the earlier πh11/2assignment, and with the second band being based on the πd5/2[420]1/2+configuration. The data suggest that the band based upon the πh11/2configuration is not observed.
Original languageEnglish
Pages (from-to)243-249
Number of pages7
JournalPhysics Letters B
Early online date26 Nov 2014
Publication statusPublished - 1 Jan 2015


  • proton decay
  • recoil-decay tagging
  • Gamma-ray Spectroscopy
  • High-spin states
  • Quasiparticle alignments


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