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

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 (73-7...

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Bibliographic Details
Published in:Physical review letters 2014-07, Vol.113 (3), p.032505-032505
Main Authors: Xu, Z Y, Nishimura, S, Lorusso, G, Browne, F, Doornenbal, P, Gey, G, Jung, H-S, Li, Z, Niikura, M, Söderström, P-A, Sumikama, T, Taprogge, J, Vajta, Zs, Watanabe, H, Wu, J, Yagi, A, Yoshinaga, K, Baba, H, Franchoo, S, Isobe, T, John, P R, Kojouharov, I, Kubono, S, Kurz, N, Matea, I, Matsui, K, Mengoni, D, Morfouace, P, Napoli, D R, Naqvi, F, Nishibata, H, Odahara, A, Sahin, E, Sakurai, H, Schaffner, H, Stefan, I G, Suzuki, D, Taniuchi, R, Werner, V
Format: Article
Language:English
Subjects:
Nuclear Theory
Physics
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.113.032505