Shell Evolution towards Ni 78 : Low-Lying States in Cu 77

Abstract : The level structure of the neutron-rich 77Cu nucleus is investigated through β-delayed γ-ray spectroscopy at the Radioactive Isotope Beam Factory of the RIKEN Nishina Center. Ions of 77Ni are produced by in-flight fission, separated and identified in the BigRIPS fragment separator, and implanted in the WAS3ABi silicon detector array, surrounded by Ge cluster detectors of the EURICA array. A large number of excited states in 77Cu are identified for the first time by correlating γ rays with the β decay of 77Ni, and a level scheme is constructed by utilizing their coincidence relationships. The good agreement between large-scale Monte Carlo shell model calculations and experimental results allows for the evaluation of the single-particle structure near 78Ni and suggests a single-particle nature for both the 5/2−1 and 3/2−1 states in 77Cu, leading to doubly magic 78Ni.
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Article dans une revue
Physical Review Letters, American Physical Society, 2017, 118 (24), pp.242502. 〈10.1103/PhysRevLett.118.242502〉
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Soumis le : lundi 19 juin 2017 - 08:58:47
Dernière modification le : jeudi 11 janvier 2018 - 06:13:11

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E. Sahin, F. Bello Garrote, Y. Tsunoda, T. Otsuka, G. De Angelis, et al.. Shell Evolution towards Ni 78 : Low-Lying States in Cu 77. Physical Review Letters, American Physical Society, 2017, 118 (24), pp.242502. 〈10.1103/PhysRevLett.118.242502〉. 〈in2p3-01541245〉

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