Deep inelastic reactions and isomers in neutron-rich nuclei across the perimeter of the A = 180-190 deformed region

¹ Department of Nuclear Physics, RSPE, Australian National University, Canberra, ACT 0200 Australia
² RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
³ Nuclear Engineering Division, Argonne National Laboratory, Argonne IL, 60439, U.S.A.
⁴ Physics Division, Argonne National Laboratory, Argonne IL, 60439, U.S.A.
⁵ Department of Physics, University of Massachusetts Lowell, Lowell, MA 01854, U.S.A.
⁶ School of Physics, Peking University, Beijing 100871, China
⁷ School of Physics and Nuclear Energy Engineering, Beihang University, Beihang 100191, China
⁸ Dept of Physics, University of Richmond, 28 Westhampton Way, Richmond, VA 23173, USA

^a e-mail: george.dracoulis@anu.edu.au

Published online: 20 March 2014

Abstract

Recent results on high-spin isomers populated in deep-inelastic reactions in the transitional tungsten-osmium region are outlined with a focus on ¹⁹⁰Os, ¹⁹²Os and ¹⁹⁴Os. As well as the characterization of several two-quasinutron isomers, the 12⁺ and 20⁺ isomers in ¹⁹²Os are interpreted as manifestations of maximal rotation alignment within the neutron i_13/2 and possibly proton h_11/2 shells at oblate deformation.