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rapid onset of collectivity in the vicinity of 78Ni

Abstract : gamma-rays following the β and β-n decay of the very neutron rich 84Ga produced by photo-fission of 238U have been studied at the newly built ISOL facility of IPN Orsay: ALTO. Two activities were observed and assigned to two β-decaying states: 84gGa, I = (0−) and 84mGa, I= (3−,4−). Excitation energies of the 2+1 and 4+1 excited states of 84Ge were measured at E(2+1 ) = 624.3 keV and E(4+1 ) = 1670.1 keV. Comparison with HFB+GCM calculations allows to establish the collective character of this nucleus indicating a substantial N=50 core polarization. The excitation energy of the 1/2+1 state in 83Ga known to carry a large part of the neutron 3s1/2 strength was measured at 247.8keV. Altogether these data allow to confirm the new single particle state ordering which appears immediately after the double Z=28 and N=50 shell closure and to designate 78Ni as a fragile and easily polarized doubly-magic core.
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Contributor : Fadi Ibrahim <>
Submitted on : Tuesday, October 21, 2008 - 5:51:32 PM
Last modification on : Friday, December 4, 2020 - 9:42:07 AM
Long-term archiving on: : Monday, June 7, 2010 - 7:12:58 PM


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  • HAL Id : in2p3-00332820, version 1
  • ARXIV : 0810.3890



Lebois Matthieu, David Verney, Fadi Ibrahim, Said Essabaa, Faiçal Azaiez, et al.. rapid onset of collectivity in the vicinity of 78Ni. 2008. ⟨in2p3-00332820⟩



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