TY - JOUR
T1 - Determination of the 21+→01+ transition strengths in Ni58 and Ni60
AU - Orce, J. N.
AU - Crider, B.
AU - Mukhopadhyay, S.
AU - Peters, E.
AU - Elhami, E.
AU - Scheck, M.
AU - Singh, B.
AU - McEllistrem, M. T.
AU - Yates, S. W.
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2008/6/2
Y1 - 2008/6/2
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=44949243297&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=44949243297&partnerID=8YFLogxK
U2 - 10.1103/PhysRevC.77.064301
DO - 10.1103/PhysRevC.77.064301
M3 - Article
AN - SCOPUS:44949243297
SN - 0556-2813
VL - 77
JO - Physical Review C - Nuclear Physics
JF - Physical Review C - Nuclear Physics
IS - 6
M1 - 064301
ER -