Hindered Gamow-Teller Decay to the Odd-Odd N=Z 62Ga: Absence of Proton-Neutron T=0 Condensate in A=62

Research output: Contribution to journalArticle

Abstract

Search for a new kind of superfluidity built on collective proton-neutron pairs with aligned spin is performed studying the Gamow-Teller decay of the T=1, Jπ=0+ ground state of Ge62 into excited states of the odd-odd N=Z nucleus Ga62. The experiment is performed at GSI Helmholtzzentrum für Schwerionenforschung with the Ge62 ions selected by the fragment separator and implanted in a stack of Si-strip detectors, surrounded by the RISING Ge array. A half-life of T1/2=82.9(14)  ms is measured for the Ge62 ground state. Six excited states of Ga62, populated below 2.5 MeV through Gamow-Teller transitions, are identified. Individual Gamow-Teller transition strengths agree well with theoretical predictions of the interacting shell model and the quasiparticle random phase approximation. The absence of any sizable low-lying Gamow-Teller strength in the reported beta-decay experiment supports the hypothesis of a negligible role of coherent T=0 proton-neutron correlations in Ga62.

Details

Authors
  • E. Grodner
  • A. Gadea
  • P. Sarriguren
  • S. M. Lenzi
  • J. Grebosz
  • J. J. Valiente-Dobón
  • A. Algora
  • M. Górska
  • P. H. Regan
  • G. de Angelis
  • J. Agramunt
  • N. Alkhomashi
  • L. Amon Susam
  • D. Bazzacco
  • J. Benlliure
  • G. Benzoni
  • P. Boutachkov
  • A. Bracco
  • L. Caceres
  • R. B. Cakirli
  • F. C. L. Crespi
  • C. Domingo-Pardo
  • M. Doncel
  • Zs. Dombrádi
  • P. Doornenbal
  • E. Farnea
  • E. Ganioğlu
  • W. Gelletly
  • J. Gerl
  • A. Gottardo
  • T. Hüyük
  • N. Kurz
  • S. Leoni
  • D. Mengoni
  • F. Molina
  • A. I. Morales
  • R. Orlandi
  • Y. Oktem
  • R. D. Page
  • D. Perez
  • S. Pietri
  • Zs. Podolyák
  • A. Poves
  • B. Quintana
  • S. Rinta-Antila
  • B. Rubio
  • B. S. Nara Singh
  • A. N. Steer
  • S. Verma
  • R. Wadsworth
  • O. Wieland
  • H. J. Wollersheim
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics
Original languageEnglish
Article number092501
Number of pages4
JournalPhysical Review Letters
Volume113
Issue number9
Publication statusPublished - 2014
Publication categoryResearch
Peer-reviewedYes

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