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American Physical Society, Physical Review Letters, 3(113)

DOI: 10.1103/physrevlett.113.032505

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β -Decay Half-Lives of Co76,77 , Ni79,80 , and Cu81 : Experimental Indication of a Doubly Magi

Journal article published in 2014 by Z. Y. Xu ORCID, S. Nishimura, G. Lorusso, F. Browne, P. Doornenbal, G. Gey, H.-S. Jung, Z. Li, M. Niikura, P.-A. Söderström, T. Sumikama, J. Taprogge, Z.-S. Vajta, H. Watanabe, J. Wu ORCID and other authors.
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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 Co-76(21.7(-4.9) (+6.5) ms), Co-77(13.0(-4.3) (+7.2) ms), Ni-79(43.0(-7.5)(+8.6) ms), Ni-80(23.9(-17.2)(+26.0) ms), and Cu-81(73.2 +/- 6.8 ms). In addition, the half-lives of Co73-75, Ni74-78, Cu78-80, and Zn80-82 were determined with higher precision than previous works. Based on these new results, a systematic study of the beta-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 Ni-78.