1. Collective And Single-particle Structures In The Neutron-rich Doubly Mid-shell Nucleus 170Dy
- Author
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N. Kurz, K. Y. Chae, Naoki Fukuda, Raymond J. Carroll, Zs. Podolyák, Shigeru Kubono, S. Kanaya, István Kuti, Atsuko Odahara, Philip M Walker, H. Baba, Toshiyuki Sumikama, H. Phong, I. Nishizuka, Thamer Alharbi, Zhengyu Xu, Ayumi Yagi, Shunji Nishimura, Furong Xu, Hiroyuki Takeda, Oliver J. Roberts, Gavin Lotay, Z. Patel, C. M. Shand, T. Isobe, J. J. Valiente-Dobón, Alfredo Estrade, J. Liu, F. G. Kondev, Söderström Pär-anders, Hiroshi Watanabe, S. Terashima, Chang-Bum Moon, H. Kanaoka, Z. Korkulu, Jin Wu, C. J. Griffin, Hiroshi Suzuki, Toshiyuki Kubo, Eiji Ideguchi, I. Kojouharov, D. S. Ahn, G. J. Lane, Giuseppe Lorusso, Naohito Inabe, C. H. Lee, Alison Bruce, P. Doornenbal, S. Lalkovski, P. H. Regan, Eunji Lee, P. Lee, H. L. Liu, H. Sakuraia, C. R. Niţă, F. Browne, Zs. Dombrádi, G. X. Zhang, Zs. Vajta, and H. Schaffner
- Subjects
Physics ,Fission ,Nuclear Theory ,Nuclear structure ,Spherical shell ,Nuclear physics ,medicine.anatomical_structure ,Rigidity (electromagnetism) ,Atomic nucleus ,Quadrupole ,medicine ,Neutron ,Atomic physics ,Nuclear Experiment ,Nucleus - 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, $^{170}$Dy 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 $^{170}$Dy nuclei by in-flight fission of a $^{238}$U 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.
- Published
- 2017