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First gamma-ray spectroscopy of Fe-49 and Ni-53: isospin-breaking effects at large proton excess

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JournalPhysical Review C
DatePublished - 6 Jul 2009
Issue number1
Volume80
Number of pages5
Pages (from-to)1-5
Original languageEnglish

Abstract

Isospin-breaking effects have been studied for the first time in T=32 isobaric analog states. Gamma decays have been observed from T-z=-32 nuclei, Fe-49 and Ni-53, presented here in new level schemes, and mirror energy differences have been computed following observation of analog states in V-49 and Mn-53, respectively. Shell-model calculations in the fp shell are in good agreement with the data and reveal the importance of non-Coulomb isospin-breaking effects in T=32 isobaric analog states. A two-step fragmentation process was developed to allow access to highly proton-rich nuclei and to produce each member of a mirror pair via mirrored fragmentation of a Ni-56 secondary beam. This work represents the first study using this technique and demonstrates the power of this approach for future studies of isobaric analog states in very proton-rich systems.

    Research areas

  • SHELL-MODEL, EXOTIC NUCLEI, SYMMETRY, ENERGIES, STATES, CR-49, V-49

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