Direct lifetime measurements of the excited states in Ni72

Kolos, K.; Miller, D.; Grzywacz, R.; Iwasaki, H.; Al-Shudifat, M.; Bazin, D.; Bingham, C. R.; Braunroth, T.; Cerizza, G.; Gade, A.; Lemasson, A.; Liddick, S. N.; Madurga, M.; Morse, C.; Portillo, M.; Rajabali, M. M.; Recchia, F.; Riedinger, L. L.; Voss, P.; Walters, W. B.; Weisshaar, D.; Whitmore, K.; Wimmer, K.; Tostevin, J. A.

doi:10.1103/PhysRevLett.116.122502

Title: Direct lifetime measurements of the excited states in ${}^{72}{Ni}$

Journal Article · Tue Mar 22 00:00:00 EDT 2016 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.116.122502· OSTI ID:1337489

Kolos, K. ^[1]; Miller, D. ^[2]; Grzywacz, R. ^[3]; Iwasaki, H. ^[4]; Al-Shudifat, M. ^[5]; Bazin, D. ^[4]; Bingham, C. R. ^[3]; Braunroth, T. ^[6]; Cerizza, G. ^[5]; Gade, A. ^[4]; Lemasson, A. ^[4]; Liddick, S. N. ^[4]; Madurga, M. ^[5]; Morse, C. ^[4]; Portillo, M. ^[4]; Rajabali, M. M. ^[2]; Recchia, F. ^[4]; Riedinger, L. L. ^[3]; Voss, P. ^[7]; Walters, W. B. ^[8] more »

Univ. of Tennessee, Knoxville, TN (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
TRIUMF, Vancouver, BC (Canada)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Michigan State Univ., East Lansing, MI (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Institut fur Kernphysik der Univ. zu Koln, Koln (Germany)
Simon Fraser Univ., Burnaby, BC (Canada)
Univ. of Maryland, College Park, MD (United States)
Central Michigan Univ., Mount Pleasant, MI (United States)
Univ. of Surrey, Guildford (United Kingdom)

The lifetimes of the first excited 2⁺ and 4⁺ states in ⁷²Ni 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 ⁷²Ni were populated by the one-proton knockout reaction of an intermediate energy ⁷³Cu 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 ⁶⁸Ni, but do not confirm the trend of large B(E2) values reported in the neighboring isotope ⁷⁰Ni obtained from Coulomb excitation measurement. The results are compared to shell model calculations. Here, 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 ⁷²Ni.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 1337489

Journal Information:: Physical Review Letters, Vol. 116, Issue 12; ISSN 0031-9007

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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