Nuclear “magic numbers” collapse beyond the doubly magic Nickel 78
Overview of the press release
Scientists from the RIKEN Nishina Center for Accelerator-Based Research and collaborators have used the center’s heavy ion accelerator, the RI Beam Factory, to demonstrate that nickel 78, a neutron-rich “doubly magic” isotope of nickel with 28 protons and 50 neutrons, still maintains a spherical shape that allows it to be relatively stable despite the large imbalance in the number of protons and neutrons. They also discovered a surprise, with the observations from the experiment suggesting that nickel 78 may be the lightest nucleus with 50 neutrons to have a magic nature. Lighter isotones—meaning nuclei with the same number of neutrons but different number of protons—despite having the magic number of neutrons, would inevitably be deformed.
The study was published in Nature on May 2, 2019.
Figure. Nickel 78, which was investigated in this research, is one of the doubly magic nuclei located closest to the limitation of existence, the two-neutron drip line.
To read the full press release, please visit the RIKEN website.
The first author, Dr. Ryo Taniuchi (RIKEN; formerly a graduate student in the Department of Physics, Graduate School of Science, The University of Tokyo), and Professor Hiroyoshi Sakurai (Department of Physics, Graduate School of Science, The University of Tokyo; RIKEN) have contributed to this research.
Journal Nature Title Nuclear “magic numbers” collapse beyond the doubly magic Nickel 78 Authors R. Taniuchi, C. Santamaria, P. Doornenbal, A. Obertelli, K. Yoneda, G. Authelet, H. Baba, D. Calvet, F. Château, A. Corsi, A. Delbart, J.-M. Gheller, A. Gillibert, J.D. Holt, T. Isobe, V. Lapoux, M. Matsushita, J. Menéndez, S. Momiyama, T. Motobayashi, M. Niikura, F. Nowacki, K. Ogata, H. Otsu, T. Otsuka, C. Péron, S. Péru, A. Peyaud, E.C. Pollacco, A. Poves, J.-Y. Roussé, H. Sakurai, A. Schwenk, Y. Shiga, J. Simonis, S.R. Stroberg, S. Takeuchi, Y. Tsunoda, T. Uesaka, H. Wang, F. Browne, L.X. Chung, Zs. Dombradi, S. Franchoo, F. Giacoppo, A. Gottardo, K. Hadynska-Klek, Z. Korkulu, S. Koyama, Y. Kubota, J. Lee, M. Lettmann, C. Louchart, R. Lozeva, K. Matsui, T. Miyazaki, S. Nishimura, L. Olivier, S. Ota, Z. Patel, E. Sahin, C. Shand, P.-A. Söderström, I. Stefan, D. Steppenbeck, T. Sumikama, D. Suzuki, Zs. Vajta, V. Werner, J. Wu, and Z.Y. Xu DOI 10.1038/s41586-019-1155-x
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