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β-Decay half-lives of 76,77Co, 79,80Ni, and 81Cu: experimental indication of a doubly magic 78Ni.

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Affiliations

  • 1. Department of Physics, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, 113-0033 Tokyo, Japan and RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
      Authors
    • Xu ZY 1
    • Sakurai H 1
    (2 authors)
  • 2. RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
      Authors
    • Nishimura S 2
    • Lorusso G 2
    • Doornenbal P 2
    • Söderström PA 2
    • Baba H 2
    • Isobe T 2
    • Kubono S 2
    (7 authors)
  • 3. RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan and School of Computing, Engineering and Mathematics, University of Brighton, Brighton BN2 4GJ, United Kingdom.
      Authors
    • Browne F 3
    (1 author)
  • 4. RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan and LPSC, Université Grenoble-Alpes, CNRS/IN2P3, F-38026 Grenoble Cedex, France and ILL, 38042 Grenoble Cedex, France.
      Authors
    • Gey G 4
    (1 author)
  • 5. Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA.
      Authors
    • Jung HS 5
    (1 author)
    • Show all (20)

ORCIDs linked to this article

Show all (17)

Physical Review Letters, 16 Jul 2014, 113(3):032505
https://doi.org/10.1103/physrevlett.113.032505 PMID: 25083639 

Abstract 

The half-lives of 20 neutron-rich nuclei with Z=27-30 have been measured at the RIBF, including five new half-lives of (76)Co(21.7(-4.9)(+6.5) ms), (77)Co(13.0(-4.3)(+7.2) ms), (79)Ni(43.0(-7.5)(+8.6) ms), (80)Ni(23.9(-17.2)(+26.0) ms), and (81)Cu(73.2 ± 6.8 ms). In addition, the half-lives of (73-75)Co, (74-78)Ni, (78-80)Cu, and (80-82)Zn were determined with higher precision than previous works. Based on these new results, a systematic study of the β-decay half-lives has been carried out, which suggests a sizable magicity for both the proton number Z = 28 and the neutron number N=50 in (78)Ni.

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Read article at publisher's site: https://doi.org/10.1103/physrevlett.113.032505

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Funding 

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U.S. Department of Energy (1)