Isospin Symmetry and Proton Decay: Identification of the 10+ Isomer in 54Ni

Dirk Rudolph, Robert Hoischen, Margareta Hellström, S. Pietri, Zs. Podolyák, P. H. Regan, A. B. Garnsworthy, S. J. Steer, F. Becker, P. Bednarczyk, L. Caceres, P. Doornenbal, J. Gerl, M. Górska, J. Grebosz, I. Kojouharov, N. Kurz, W. Prokopowicz, H. Schaffner, H. J. WollersheimLise-Lotte Andersson, L. Atanasova, D. L. Balabanski, M. A. Bentley, A. Blazhev, C. Brandau, J. R. Brown, Claes Fahlander, Emma Johansson, A. Jungclaus, S. M. Lenzi

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The gamma decays from an isomeric 10+ state at 6457 keV in the nucleus 54Ni 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 54Fe. 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 53Co. This decay is the first of its kind observed following projectile fragmentation reactions.
TidskriftPhysical Review C (Nuclear Physics)
StatusPublished - 2008

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