78Ni revealed as a doubly magic stronghold against nuclear deformation

Taniuchi, R.; Santamaria, C.; Doornenbal, P.; Obertelli, A.; Yoneda, K.; Authelet, G.; Baba, H.; Calvet, D.; Château, F.; Corsi, A.; Delbart, A.; Gheller, J.-M.; Gillibert, A.; Holt, J. D.; Isobe, T.; Lapoux, V.; Matsushita, M.; Menéndez, J.; Momiyama, S.; Motobayashi, T.; Niikura, M.; Nowacki, F.; Ogata, K.; Otsu, H.; Otsuka, T.; Péron, C.; Péru, S.; Peyaud, A.; Pollacco, E. C.; Poves, A.; Roussé, J.-Y.; Sakurai, H.; Schwenk, A.; Shiga, Y.; Simonis, J.; Stroberg, S. R.; Takeuchi, S.; Tsunoda, Y.; Uesaka, T.; Wang, H.; Browne, F.; Chung, L. X.; Dombradi, Z.; Franchoo, S.; Giacoppo, F.; Gottardo, A.; Hadyńska-Klęk, K.; Korkulu, Z.; Koyama, S.; Kubota, Y.; Lee, J.; Lettmann, M.; Louchart, C.; Lozeva, R.; Matsui, K.; Miyazaki, T.; Nishimura, S.; Olivier, L.; Ota, S.; Patel, Z.; Şahin, E.; Shand, C.; Söderström, P.-A.; Stefan, I.; Steppenbeck, D.; Sumikama, T.; Suzuki, D.; Vajta, Z.; Werner, V.; Wu, J.; Xu, Z. Y.

78Ni revealed as a doubly magic stronghold against nuclear deformation

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, Z. Dombradi, S. Franchoo, F. Giacoppo, A. Gottardo, K. Hadyńska-Klęk, 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. Şahin, C. Shand, P.-A. Söderström, I. Stefan, D. Steppenbeck, T. Sumikama, D. Suzuki, Z. Vajta, V. Werner, J. Wu and Z. Y. Xu
Additional contact information
R. Taniuchi: The University of Tokyo
C. Santamaria: RIKEN Nishina Center
P. Doornenbal: RIKEN Nishina Center
A. Obertelli: RIKEN Nishina Center
K. Yoneda: RIKEN Nishina Center
G. Authelet: IRFU, CEA, Université Paris-Saclay
H. Baba: RIKEN Nishina Center
D. Calvet: IRFU, CEA, Université Paris-Saclay
F. Château: IRFU, CEA, Université Paris-Saclay
A. Corsi: IRFU, CEA, Université Paris-Saclay
A. Delbart: IRFU, CEA, Université Paris-Saclay
J.-M. Gheller: IRFU, CEA, Université Paris-Saclay
A. Gillibert: IRFU, CEA, Université Paris-Saclay
J. D. Holt: TRIUMF
T. Isobe: RIKEN Nishina Center
V. Lapoux: IRFU, CEA, Université Paris-Saclay
M. Matsushita: The University of Tokyo
J. Menéndez: The University of Tokyo
S. Momiyama: The University of Tokyo
T. Motobayashi: RIKEN Nishina Center
M. Niikura: The University of Tokyo
F. Nowacki: IPHC, CNRS/IN2P3, Université de Strasbourg
K. Ogata: Osaka University
H. Otsu: RIKEN Nishina Center
T. Otsuka: The University of Tokyo
C. Péron: IRFU, CEA, Université Paris-Saclay
S. Péru: CEA, DAM, DIF
A. Peyaud: IRFU, CEA, Université Paris-Saclay
E. C. Pollacco: IRFU, CEA, Université Paris-Saclay
A. Poves: Universidad Autónoma de Madrid
J.-Y. Roussé: IRFU, CEA, Université Paris-Saclay
H. Sakurai: The University of Tokyo
A. Schwenk: Institut für Kernphysik, Technische Universität Darmstadt
Y. Shiga: RIKEN Nishina Center
J. Simonis: Institut für Kernphysik, Technische Universität Darmstadt
S. R. Stroberg: TRIUMF
S. Takeuchi: RIKEN Nishina Center
Y. Tsunoda: The University of Tokyo
T. Uesaka: RIKEN Nishina Center
H. Wang: RIKEN Nishina Center
F. Browne: University of Brighton
L. X. Chung: Institute for Nuclear Science & Technology, VINATOM
Z. Dombradi: MTA Atomki
S. Franchoo: Université Paris-Saclay
F. Giacoppo: University of Oslo
A. Gottardo: Université Paris-Saclay
K. Hadyńska-Klęk: University of Oslo
Z. Korkulu: MTA Atomki
S. Koyama: The University of Tokyo
Y. Kubota: RIKEN Nishina Center
J. Lee: The University of Hong Kong
M. Lettmann: Institut für Kernphysik, Technische Universität Darmstadt
C. Louchart: Institut für Kernphysik, Technische Universität Darmstadt
R. Lozeva: IPHC, CNRS/IN2P3, Université de Strasbourg
K. Matsui: The University of Tokyo
T. Miyazaki: The University of Tokyo
S. Nishimura: RIKEN Nishina Center
L. Olivier: Université Paris-Saclay
S. Ota: The University of Tokyo
Z. Patel: University of Surrey
E. Şahin: University of Oslo
C. Shand: University of Surrey
P.-A. Söderström: RIKEN Nishina Center
I. Stefan: Université Paris-Saclay
D. Steppenbeck: The University of Tokyo
T. Sumikama: Tohoku University
D. Suzuki: Université Paris-Saclay
Z. Vajta: MTA Atomki
V. Werner: Institut für Kernphysik, Technische Universität Darmstadt
J. Wu: RIKEN Nishina Center
Z. Y. Xu: The University of Hong Kong

Nature, 2019, vol. 569, issue 7754, 53-58

Abstract: Abstract Nuclear magic numbers correspond to fully occupied energy shells of protons or neutrons inside atomic nuclei. Doubly magic nuclei, with magic numbers for both protons and neutrons, are spherical and extremely rare across the nuclear landscape. Although the sequence of magic numbers is well established for stable nuclei, experimental evidence has revealed modifications for nuclei with a large asymmetry between proton and neutron numbers. Here we provide a spectroscopic study of the doubly magic nucleus 78Ni, which contains fourteen neutrons more than the heaviest stable nickel isotope. We provide direct evidence of its doubly magic nature, which is also predicted by ab initio calculations based on chiral effective-field theory interactions and the quasi-particle random-phase approximation. Our results also indicate the breakdown of the neutron magic number 50 and proton magic number 28 beyond this stronghold, caused by a competing deformed structure. State-of-the-art phenomenological shell-model calculations reproduce this shape coexistence, predicting a rapid transition from spherical to deformed ground states, with 78Ni as the turning point.

Date: 2019
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DOI: 10.1038/s41586-019-1155-x

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