Determination of the 2+1→0+1 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

Research output: Contribution to journalArticle

Abstract

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 2+1 state in Ni58 is determined as τ=1.00+0.15−0.10 ps, which yields a B(E2;2+1→0+1) value of 9.4+1.0−1.2 W.u. From previous measurements and this work, average values of τ=0.94(3) ps and B(E2;2+1→0+1)=10.0(4) W.u. are recommended as standards for normalization. In addition, a longer lifetime of τ=1.30+0.30−0.20 ps has been determined for the 2+1 state in Ni60, which yields an E2 strength of 10.7+1.7−2.5 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
Pages (from-to)064301
JournalPhysical Review C
Volume77
Issue number6
DOIs
Publication statusPublished - Jun 2008
Externally publishedYes

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life (durability)
angular distribution
isotopes
quadrupoles
attenuation
gamma rays
neutrons
protons
augmentation
shift
excitation
energy

Cite this

Orce, J. N., Crider, B., Mukhopadhyay, S., Peters, E., Elhami, E., Scheck, M., ... Yates, S. W. (2008). Determination of the 2+1→0+1 transition strengths in Ni58 and Ni60. Physical Review C, 77(6), 064301. https://doi.org/10.1103/PhysRevC.77.064301
Orce, J. N. ; Crider, B. ; Mukhopadhyay, S. ; Peters, E. ; Elhami, E. ; Scheck, M. ; Singh, B. ; McEllistrem, M. T. ; Yates, S. W. / Determination of the 2+1→0+1 transition strengths in Ni58 and Ni60. In: Physical Review C. 2008 ; Vol. 77, No. 6. pp. 064301.
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Orce, JN, Crider, B, Mukhopadhyay, S, Peters, E, Elhami, E, Scheck, M, Singh, B, McEllistrem, MT & Yates, SW 2008, 'Determination of the 2+1→0+1 transition strengths in Ni58 and Ni60' Physical Review C, vol. 77, no. 6, pp. 064301. https://doi.org/10.1103/PhysRevC.77.064301

Determination of the 2+1→0+1 transition strengths in Ni58 and Ni60. / Orce, J. N.; Crider, B.; Mukhopadhyay, S.; Peters, E.; Elhami, E.; Scheck, M.; Singh, B.; McEllistrem, M. T.; Yates, S. W.

In: Physical Review C, Vol. 77, No. 6, 06.2008, p. 064301.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Determination of the 2+1→0+1 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.

PY - 2008/6

Y1 - 2008/6

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 2+1 state in Ni58 is determined as τ=1.00+0.15−0.10 ps, which yields a B(E2;2+1→0+1) value of 9.4+1.0−1.2 W.u. From previous measurements and this work, average values of τ=0.94(3) ps and B(E2;2+1→0+1)=10.0(4) W.u. are recommended as standards for normalization. In addition, a longer lifetime of τ=1.30+0.30−0.20 ps has been determined for the 2+1 state in Ni60, which yields an E2 strength of 10.7+1.7−2.5 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 2+1 state in Ni58 is determined as τ=1.00+0.15−0.10 ps, which yields a B(E2;2+1→0+1) value of 9.4+1.0−1.2 W.u. From previous measurements and this work, average values of τ=0.94(3) ps and B(E2;2+1→0+1)=10.0(4) W.u. are recommended as standards for normalization. In addition, a longer lifetime of τ=1.30+0.30−0.20 ps has been determined for the 2+1 state in Ni60, which yields an E2 strength of 10.7+1.7−2.5 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.

U2 - 10.1103/PhysRevC.77.064301

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