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Title: Shape coexistence in Ni 68

Abstract

The internal-conversion and internal-pair-production decays of the first excited 0 + state in 68Ni are studied following the β decay of 68Co. A novel experimental technique, in which the ions of 68 Co were implanted into a planar germanium double-sided strip detector and which required digital pulse processing, is developed. The values for the energy of the first excited 0 + state and the electric monopole transition strength from the first excited 0 + state to the ground state in 68Ni are determined to be 1605(3) keV and 7.6 (4) × 10 -3 , respectively. Comparisons of the experimental results to Monte Carlo shell-model calculations suggest the coexistence between a spherical ground state and an oblate first excited 0 + state in 68Ni.

Authors:
 [1];  [1];  [2];  [3];  [1];  [1];  [4];  [1];  [1];  [1];  [5];  [1];  [1];  [6];  [7];  [6]
  1. Michigan State Univ., East Lansing, MI (United States)
  2. Univ. of Tokyo (Japan). Dept. of Physics
  3. Michigan State Univ., East Lansing, MI (United States); Univ. of Tokyo (Japan)
  4. Univ. of Aizu, Fukushima (Japan)
  5. Univ. of Tokyo (Japan)
  6. Florida State Univ., Tallahassee, FL (United States)
  7. Japan Atomic Energy Agency (JAEA), Tokai (Japan). Advanced Science Research Center
Publication Date:
Research Org.:
Nuclear Science and Security Consortium, Berkeley, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1454854
Grant/Contract Number:  
NA0000979
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 89; Journal Issue: 2; Journal ID: ISSN 0556-2813
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Suchyta, S., Liddick, S. N., Tsunoda, Y., Otsuka, T., Bennett, M. B., Chemey, A., Honma, M., Larson, N., Prokop, C. J., Quinn, S. J., Shimizu, N., Simon, A., Spyrou, A., Tripathi, V., Utsuno, Y., and VonMoss, J. M. Shape coexistence in Ni68. United States: N. p., 2014. Web. doi:10.1103/PhysRevC.89.021301.
Suchyta, S., Liddick, S. N., Tsunoda, Y., Otsuka, T., Bennett, M. B., Chemey, A., Honma, M., Larson, N., Prokop, C. J., Quinn, S. J., Shimizu, N., Simon, A., Spyrou, A., Tripathi, V., Utsuno, Y., & VonMoss, J. M. Shape coexistence in Ni68. United States. doi:10.1103/PhysRevC.89.021301.
Suchyta, S., Liddick, S. N., Tsunoda, Y., Otsuka, T., Bennett, M. B., Chemey, A., Honma, M., Larson, N., Prokop, C. J., Quinn, S. J., Shimizu, N., Simon, A., Spyrou, A., Tripathi, V., Utsuno, Y., and VonMoss, J. M. Tue . "Shape coexistence in Ni68". United States. doi:10.1103/PhysRevC.89.021301. https://www.osti.gov/servlets/purl/1454854.
@article{osti_1454854,
title = {Shape coexistence in Ni68},
author = {Suchyta, S. and Liddick, S. N. and Tsunoda, Y. and Otsuka, T. and Bennett, M. B. and Chemey, A. and Honma, M. and Larson, N. and Prokop, C. J. and Quinn, S. J. and Shimizu, N. and Simon, A. and Spyrou, A. and Tripathi, V. and Utsuno, Y. and VonMoss, J. M.},
abstractNote = {The internal-conversion and internal-pair-production decays of the first excited 0+ state in 68Ni are studied following the β decay of 68Co. A novel experimental technique, in which the ions of 68 Co were implanted into a planar germanium double-sided strip detector and which required digital pulse processing, is developed. The values for the energy of the first excited 0+ state and the electric monopole transition strength from the first excited 0+ state to the ground state in 68Ni are determined to be 1605(3) keV and 7.6 (4) × 10-3 , respectively. Comparisons of the experimental results to Monte Carlo shell-model calculations suggest the coexistence between a spherical ground state and an oblate first excited 0+ state in 68Ni.},
doi = {10.1103/PhysRevC.89.021301},
journal = {Physical Review. C, Nuclear Physics},
number = 2,
volume = 89,
place = {United States},
year = {2014},
month = {2}
}

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Figures / Tables:

Figure 1 Figure 1: (a) Time profile of a GeDSSD detector signal for a 68Co $\beta$ decay followed by an internal transition. (b) Energy spectra measured in the GeDSSD for events which occurred less than 2 s following the arrival of a 68Co ion, showing signals attributed to the detection of amore » single $\beta$-decay electron or ray (upper, blue curve) and signals due to the detection of sequential radiations within 600 ns of each other in the GeDSSD (lower, red curve). The peaks at 570 and 1604 keV are attributed to the detection of internal transitions from the first excited 0+ state to the ground state in 68Ni following decay of 68Co. (c) The $\gamma$-ray energy spectrum detected by SeGA in coincidence with “stair-step” signals in the GeDSSD.« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.