Soderstrom, P.-A.Walker, Philip MWu, J.Liu, H LRegan, P HWatanabe, HDoornenbal, P.Korkulu, ZLee, P. S.Liu, J JLorusso, GNishimura, SPhong, V. H.Lane, Gregory2024-08-022024-08-0211-16 Sept1824-8039https://hdl.handle.net/1885/733714408One 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.application/pdfen-AU© 2016 The Author(s)http://creativecommons.org/licenses/by-nc-nd/4.0/201610.22323/1.281.00722023-09-17Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License