Determination of the 2{sub 1}{sup +}{yields}0{sub 1}{sup +} transition strengths in {sup 58}Ni and {sup 60}Ni
- Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506-0055 (United States)
- Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506-0055 (United States)
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1 (Canada)
Gamma-ray angular distribution measurements following the {sup nat}Ni(n,n{sup '}{gamma}) reaction were carried out at 1.6 and 1.8 MeV neutron energies. Through the Doppler-shift attenuation method, the lifetime of the 2{sub 1}{sup +} state in {sup 58}Ni is determined as {tau}=1.00{sub -0.10}{sup +0.15} ps, which yields a B(E2;2{sub 1}{sup +}{yields}0{sub 1}{sup +}) value of 9.4{sub -1.2}{sup +1.0} W.u. From previous measurements and this work, average values of {tau}=0.94(3) ps and B(E2;2{sub 1}{sup +}{yields}0{sub 1}{sup +})=10.0(4) W.u. are recommended as standards for normalization. In addition, a longer lifetime of {tau}=1.30{sub -0.20}{sup +0.30} ps has been determined for the 2{sub 1}{sup +} state in {sup 60}Ni, which yields an E2 strength of 10.7{sub -2.5}{sup +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.
- OSTI ID:
- 21191929
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 77, Issue 6; Other Information: DOI: 10.1103/PhysRevC.77.064301; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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