Determination of the 21+→01+ transition strengths in Ni58 and Ni60

J. N. Orce, B. Crider, S. Mukhopadhyay, E. Peters, E. Elhami, M. Scheck, B. Singh, M. T. McEllistrem, S. W. Yates

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14 Scopus citations


Gamma-ray angular distribution measurements following the natNi(n,n'γ) reaction were carried out at 1.6 and 1.8 MeV neutron energies. Through the Doppler-shift attenuation method, the lifetime of the 21+ state in Ni58 is determined as τ=1.00-0.10+0.15 ps, which yields a B(E2;21+→01+) value of 9.4-1.2+1.0 W.u. From previous measurements and this work, average values of τ=0.94(3) ps and B(E2;21+→01+)=10.0(4) W.u. are recommended as standards for normalization. In addition, a longer lifetime of τ=1.30-0.20+0.30 ps has been determined for the 21+ state in Ni60, which yields an E2 strength of 10.7-2.5+1.7 W.u. Our results support an enhancement of proton-core excitations and related quadrupole and pairing strengths in the light Ni isotopes, in agreement with mean-field and shell-model calculations.

Original languageEnglish
Article number064301
JournalPhysical Review C - Nuclear Physics
Issue number6
StatePublished - Jun 2 2008

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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