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Kolos K, Miller D, Grzywacz R, et al. Direct Lifetime Measurements of the Excited States in (72)Ni. Phys Rev Lett. 2016;116(12):122502doi: 10.1103/PhysRevLett.116.122502.
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. (2016). Direct Lifetime Measurements of the Excited States in (72)Ni. Physical review letters, 116(12), 122502. https://doi.org/10.1103/PhysRevLett.116.122502
Kolos, K, et al. "Direct Lifetime Measurements of the Excited States in (72)Ni." Physical review letters vol. 116,12 (2016): 122502. doi: https://doi.org/10.1103/PhysRevLett.116.122502
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, Tostevin JA. Direct Lifetime Measurements of the Excited States in (72)Ni. Phys Rev Lett. 2016 Mar 25;116(12):122502. doi: 10.1103/PhysRevLett.116.122502. Epub 2016 Mar 22. PMID: 27058074.
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Phys Rev Lett. 2016 Mar 25;116(12):122502. doi: 10.1103/PhysRevLett.116.122502. Epub 2016 Mar 22.

Direct Lifetime Measurements of the Excited States in (72)Ni.

Physical review letters

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

Affiliations

  1. Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA.
  2. Lawrence Livermore National Laboratory, Livermore, California 94551, USA.
  3. TRIUMF, 4004 Westbrook Mall, Vancouver, British Columbia V6T 2A3, Canada.
  4. Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6371, USA.
  5. National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA.
  6. Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.
  7. Institut für Kernphysik der Universität zu Köln, D-50937 Köln, Germany.
  8. Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA.
  9. Simon Fraser University, Burnaby, British Columbia, V5A 1S6, Canada.
  10. University of Maryland, College Park, Maryland 20742, USA.
  11. Department of Physics, Central Michigan University, Mount Pleasant, Michigan 48859, USA.
  12. Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom.

PMID: 27058074 DOI: 10.1103/PhysRevLett.116.122502

Abstract

The lifetimes of the first excited 2^{+} and 4^{+} states in ^{72}Ni 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 ^{72}Ni were populated by the one-proton knockout reaction of an intermediate energy ^{73}Cu 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 ^{68}Ni, but do not confirm the trend of large B(E2) values reported in the neighboring isotope ^{70}Ni 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 ^{72}Ni.

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