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Phys Rev Lett. 2014 Jun 6;112(22):222501. Epub 2014 Jun 3.

Observation of the β-delayed γ-proton decay of (56)Zn and its impact on the Gamow-Teller strength evaluation.

Author information

  • 1Instituto de Física Corpuscular, CSIC-Universidad de Valencia, E-46071 Valencia, Spain.
  • 2Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan and Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan.
  • 3Centre d'Etudes Nucléaires de Bordeaux Gradignan, CNRS/IN2P3-Université Bordeaux 1, 33175 Gradignan Cedex, France.
  • 4Department of Physics, University of Surrey, Guildford GU2 7XH, Surrey, United Kingdom.
  • 5Instituto de Física Corpuscular, CSIC-Universidad de Valencia, E-46071 Valencia, Spain and Institute of Nuclear Research of the Hungarian Academy of Sciences, Debrecen H-4026, Hungary.
  • 6Department of Physics, Istanbul University, Istanbul 34134, Turkey.
  • 7Grand Accélérateur National d'Ions Lourds, BP 55027, F-14076 Caen, France.
  • 8Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan.
  • 9Instituto de Física Corpuscular, CSIC-Universidad de Valencia, E-46071 Valencia, Spain and Comisión Chilena de Energía Nuclear, Casilla 188-D, Santiago, Chile.
  • 10SCK·CEN, Boeretang 200, 2400 Mol, Belgium.
  • 11Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.

Abstract

We report the observation of a very exotic decay mode at the proton drip line, the β-delayed γ-proton decay, clearly seen in the β decay of the T_{z}=-2 nucleus ^{56}Zn. Three γ-proton sequences have been observed after the β decay. Here this decay mode, already observed in the sd shell, is seen for the first time in the fp shell. Both γ and proton decays have been taken into account in the estimation of the Fermi and Gamow-Teller strengths. Evidence for fragmentation of the Fermi strength due to strong isospin mixing is found.

PMID:
24949762
[PubMed]
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