Doubly Closed Shell of Nickel-78

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  • Taniuchi Ryo
    Department of Physics, University of York 理化学研究所仁科加速器科学研究センター
  • Doornenbal Pieter
    理化学研究所仁科加速器科学研究センター
  • Sakurai Hiroyoshi
    理化学研究所仁科加速器科学研究センター 東京大学理学系研究科

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Other Title
  • 中性子が極めて多いニッケル78原子核のソフトな二重閉殻
  • チュウセイシ ガ キワメテ オオイ ニッケル 78 ゲンシカク ノ ソフト ナ ニジュウヘイカク

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Abstract

<p>The doubly magic features of the very unstable nucleus located far from the stability line, 78Ni, were investigated experimentally. To accomplish the measurement of this short-lived isotope, a new target and detector system was developed to measure the de-excitation gamma rays with a better Doppler reconstruction following proton-knockout reactions. While the high energy of the first excited state of 78Ni corroborates its closed-shell nature, a second state was found at a similar excitation energy. This observation suggests a possible shape-coexisting nature in this nucleus and questions the nuclear shell robustness for isotopes further away from stability, where the nucleosynthesis is proposed to occur.</p>

Journal

  • Butsuri

    Butsuri 75 (11), 690-695, 2020-11-05

    The Physical Society of Japan

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