Collective and single-particle structures in the neutron-rich doubly mid-shell nucleus dy

P. A. Söderström, P. M. Walker, J. Wu, H. L. Liu, P. H. Regan, H. Watanabe, P. Doornenbal, Z. Korkulu, P. Lee, J. J. Liu, G. Lorusso, S. Nishimura, V. H. Phong, T. Sumikama, F. R. Xu, A. Yagi, G. X. Zhang, D. S. Ahn, T. Alharbi, H. BabaF. Browne, A. M. Bruce, R. J. Carrol, K. Y. Chae, Zs Dombradi, A. Estrade, N. Fukuda, C. Griffin, E. Ideguchil, N. Inabe, T. Isobe, H. Kanaoka, S. Kanaya, I. Kojouharov, F. G. Kondev, T. Kubo, S. Kubono, N. Kurz, I. Kuti, S. Lalkovski, G. J. Lane, E. J. Lee, C. S. Lee, G. Lotay, C. B. Moon, I. Nishizuka, C. R. Niţǎ, A. Odahara, Z. Patel, Zs Podolyák, O. J. Roberts, H. Sakurai, H. Schaffner, C. M. Shand, H. Suzuki, H. Takeda, S. Terashima, Zs Vajta, J. J. Valiente-Dòbon, Z. Y. Xu

Research output: Contribution to journalConference articlepeer-review

Abstract

One of the most successful descriptions of the structure of atomic nuclei is the spherical shell model. It, however, becomes impractical when moving away from closed-shell nuclei. Instead, it is the interplay between the macroscopic shape degrees of freedom and the microscopic nature of the underlying single-particle structure in a deformed basis that determines the nuclear structure. Being the heaviest nucleus precisely in the middle of, known, closed proton and neutron shells, 170Dy has become a central calibration point for tests of collective models of nuclear physics. However, besides one candidate transition from a previous experiment in Legnaro, Italy, no experimental information is available for this nucleus. Using the EURICA setup at RIKEN, which couples the worlds highest intensity in-flight fission facility with a high-efficiency HPGe array, an experiment in November 2014 produced 170Dy nuclei by in-flight fission of a 238U beam. The results from this experiment provide a wealth of information on this elusive nucleus, including the evolution of quadrupole collectivity, rigidity and higher order deformations, as well as the long sought for isomeric K = 6+ state, predicted to be exceptionally pure at mid-shell. These results provide us with a rich level scheme for discussing both single-particle and collective structures at mid-shell.

Original languageEnglish
Article number072
JournalProceedings of Science
Volume2016-September
StatePublished - 2016
Event26th International Nuclear Physics Conference, INPC 2016 - Adelaide, Australia
Duration: Sep 11 2016Sep 16 2016

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