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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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Contributor : Emmanuelle Vernay <>
Submitted on : Monday, June 19, 2017 - 8:58:47 AM
Last modification on : Tuesday, May 11, 2021 - 11:36:50 AM

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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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