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Isospin symmetry and proton decay: identification of the 10(+) isomer in Ni-54

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  • D. Rudolph
  • R. Hoischen
  • M. Hellstrom
  • S. Pietri
  • Zs. Podolyak
  • P. H. Regan
  • A. B. Garnsworthy
  • S. J. Steer
  • F. Becker
  • P. Bednarczyk
  • L. Caceres
  • P. Doornenbal
  • J. Gerl
  • M. Gorska
  • J. Grebosz
  • I. Kojouharov
  • N. Kurz
  • W. Prokopowicz
  • H. Schaffner
  • H. J. Wollersheim
  • L. -L. Andersson
  • L. Atanasova
  • D. L. Balabanski
  • A. Blazhev
  • C. Brandau
  • C. Fahlander
  • E. K. Johansson
  • A. Jungclaus
  • S. M. Lenzi


Publication details

JournalPhysical Review C
DatePublished - 6 Aug 2008
Issue number2
Number of pages5
Pages (from-to)1-5
Original languageEnglish


The gamma decays from an isomeric 10(+) state at 6457 keV in the nucleus Ni-54(28)26 have been identified using the GSI fragment separator in conjunction with the RISING Ge-detector array. The state is interpreted as the isobaric analog of the 6527-keV 10(+) isomer in Fe-54(26)28.The results are discussed in terms of isospin-dependent shell-model calculations. Clear evidence is presented for a discrete l = 5 proton decay branch into the first excited 9/2(-) state of the daughter Co-53. This decay is the first of its kind observed following projectile fragmentation reactions.

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