Experimental study of Ga84β decay: Evidence for a rapid onset of collectivity in the vicinity of Ni78

M. Lebois, D. Verney, F. Ibrahim, S. Essabaa, F. Azaiez, M. Cheikh Mhamed, E. Cottereau, P. V. Cuong, M. Ferraton, K. Flanagan, S. Franchoo, D. Guillemaud-Mueller, F. Hammache, C. Lau, F. Le Blanc, J. -F. Le Du, J. Libert, B. Mouginot, C. Petrache, B. Roussière, L. Sagui, N. de Séréville, I. Stefan, and B. Tastet
Phys. Rev. C 80, 044308 – Published 9 October 2009

Abstract

γ-rays following the β and βn decays of the very neutron rich 3184Ga53 produced by the photofission of U238 have been studied at the newly built ISOL facility of IPN Orsay: ALTO. Two activities were observed and assigned to two β-decaying states: Ga84g, Iπ=(0) and Ga84m, Iπ=(3,4). Excitation energies of the 21+ and 41+ states of 3284Ge52 were measured at E(21+)=624.3 keV and E(41+)=1670.1 keV. Comparison with HFB + GCM calculations allows to establish the collective character of this nucleus. The excitation energy of the 1/21+ state in 3283Ga51 known to carry a large part of the neutron 3s1/2 strength was measured at 247.8 keV. 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 Ni78 as a fragile and easily polarized doubly-magic core.

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  • Received 21 October 2008

DOI:https://doi.org/10.1103/PhysRevC.80.044308

©2009 American Physical Society

Authors & Affiliations

M. Lebois, D. Verney*, F. Ibrahim, S. Essabaa, F. Azaiez, M. Cheikh Mhamed, E. Cottereau, P. V. Cuong, M. Ferraton, K. Flanagan, S. Franchoo, D. Guillemaud-Mueller, F. Hammache, C. Lau, F. Le Blanc, J. -F. Le Du, J. Libert, B. Mouginot, C. Petrache, B. Roussière, L. Sagui, N. de Séréville, I. Stefan, and B. Tastet

  • Institut de Physique Nucléaire CNRS-IN2P3/Université Paris-Sud 11, Orsay, France

  • *verney@ipno.in2p3.fr
  • Permanent address: Institute of Physics, Vietnamese Academy of Sciences and Technology, Hanoi, Vietnam.

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Vol. 80, Iss. 4 — October 2009

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