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Direct Lifetime Measurements of the Excited States in Ni72

Kolos, K, Miller, D, Grzywacz, R, Iwasaki, H, Al-Shudifat, M, Bazin, D, Bingham, CR, Braunroth, T, Cerizza, G, Gade, A, Lemasson, A, Liddick, SN, Madurga, M, Morse, C, Portillo, M, Rajabali, MM, Recchia, F, Riedinger, LL, Voss, P, Walters, WB, Weisshaar, D, Whitmore, K, Wimmer, K and Tostevin, JA (2016) Direct Lifetime Measurements of the Excited States in Ni72 Physical Review Letters, 116, 122502.

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Abstract

The lifetimes of the first excited 2+ and 4+ states in Ni72 were measured at the National Superconducting Cyclotron Laboratory with the recoil-distance Doppler-shift method, a model-independent probe to obtain the reduced transition probability. Excited states in Ni72 were populated by the one-proton knockout reaction of an intermediate energy Cu73 beam. γ-ray-recoil coincidences were detected with the γ-ray tracking array GRETINA and the S800 spectrograph. Our results provide evidence of enhanced transition probability B(E2;2+→0+) as compared to Ni68, but do not confirm the trend of large B(E2) values reported in the neighboring isotope Ni70 obtained from Coulomb excitation measurement. The results are compared to shell model calculations. The lifetime obtained for the excited 4+1 state is consistent with models showing decay of a seniority ν=4, 4+ state, which is consistent with the disappearance of the 8+ isomer in Ni72.

Item Type: Article
Subjects : Physics
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
AuthorsEmailORCID
Kolos, KUNSPECIFIEDUNSPECIFIED
Miller, DUNSPECIFIEDUNSPECIFIED
Grzywacz, RUNSPECIFIEDUNSPECIFIED
Iwasaki, HUNSPECIFIEDUNSPECIFIED
Al-Shudifat, MUNSPECIFIEDUNSPECIFIED
Bazin, DUNSPECIFIEDUNSPECIFIED
Bingham, CRUNSPECIFIEDUNSPECIFIED
Braunroth, TUNSPECIFIEDUNSPECIFIED
Cerizza, GUNSPECIFIEDUNSPECIFIED
Gade, AUNSPECIFIEDUNSPECIFIED
Lemasson, AUNSPECIFIEDUNSPECIFIED
Liddick, SNUNSPECIFIEDUNSPECIFIED
Madurga, MUNSPECIFIEDUNSPECIFIED
Morse, CUNSPECIFIEDUNSPECIFIED
Portillo, MUNSPECIFIEDUNSPECIFIED
Rajabali, MMUNSPECIFIEDUNSPECIFIED
Recchia, FUNSPECIFIEDUNSPECIFIED
Riedinger, LLUNSPECIFIEDUNSPECIFIED
Voss, PUNSPECIFIEDUNSPECIFIED
Walters, WBUNSPECIFIEDUNSPECIFIED
Weisshaar, DUNSPECIFIEDUNSPECIFIED
Whitmore, KUNSPECIFIEDUNSPECIFIED
Wimmer, KUNSPECIFIEDUNSPECIFIED
Tostevin, JAUNSPECIFIEDUNSPECIFIED
Date : 22 March 2016
Identification Number : 10.1103/PhysRevLett.116.122502
Copyright Disclaimer : Copyright 2016 American Physical Society
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 21 Apr 2016 12:05
Last Modified : 21 Apr 2016 12:05
URI: http://epubs.surrey.ac.uk/id/eprint/810350

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