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Identification of excited states in Ga316130: Mirror nuclei in the upper fp shell

L-L. Andersson, E. K. Johansson, J. Ekman, D. Rudolph, R. du Rietz, C. Fahlander, C. J. Gross, P. A. Hausladen, D. C. Radford, and G. Hammond
Phys. Rev. C 71, 011303(R) – Published 24 January 2005

Abstract

In the fusion-evaporation reaction Ca40+Mg24 at 104MeV beam energy, excited states have been observed for the first time in the isotope Ga316130. The experimental setup comprised the Ge array CLARION, a recoil mass spectrometer and, in its focal plane, an ionization chamber. Five transitions in Ga61 are identified, out of which a cascade of three transitions has been established by means of recoil-γγ coincidences. The strong transitions at 271keV in Ga61 and 124keV in Zn61 are viewed as the “mirror” 5/23/2 ground-state transitions. The rather large energy difference of 150keV is suggested to arise from Coulomb monopole contributions. Shell-model calculations support this interpretation.

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  • Received 6 September 2004

DOI:https://doi.org/10.1103/PhysRevC.71.011303

©2005 American Physical Society

Authors & Affiliations

L-L. Andersson, E. K. Johansson, J. Ekman, D. Rudolph, R. du Rietz, and C. Fahlander

  • Department of Physics, Lund University, S-22100 Lund, Sweden

C. J. Gross, P. A. Hausladen, and D. C. Radford

  • Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830

G. Hammond

  • School of Chemistry and Physics, Keele University, Keele, Staffordshire, ST5 5BG, United Kingdom

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Vol. 71, Iss. 1 — January 2005

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