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

Sahin, E. and Bello Garrote, F. L. and Tsunoda, Y. and Otsuka, T. and De Angelis, G. and Sohler, D. and Vajta, Zs. (2017) Shell Evolution towards Ni 78: Low-Lying States in Cu 77. PHYSICAL REVIEW LETTERS, 118 (24). pp. 1-6. ISSN 0031-9007

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Abstract

The level structure of the neutron-rich Cu77 nucleus is investigated through β-delayed γ-ray spectroscopy at the Radioactive Isotope Beam Factory of the RIKEN Nishina Center. Ions of Ni77 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 Cu77 are identified for the first time by correlating γ rays with the β decay of Ni77, 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 Ni78 and suggests a single-particle nature for both the 5/21- and 3/21- states in Cu77, leading to doubly magic Ni78. © 2017 American Physical Society.

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