Investigation of high-K states in 252No

Abstract

In this paper we investigate the rotational band built upon a two-quasiparticle 8- isomeric state of 252No up to spin Iπ = 22-. The excited states of the band were populated with the 206Pb(48Ca,2n) fusion-evaporation reaction. An unambiguous assignment of the structure of the 8- isomer as a 7/2+[624]ν - 9/2-[734]ν configuration has been made on the basis of purely experimental data. Comparisons with triaxial self-consistent Hartree-Fock-Bogoliubov calculations using the D1S force and breaking time-reversal as well as z-signature symmetries are performed. These predictions are in agreement with present measurements. Mean-field calculations extended to similar states in 250Fm support the interpretation of the same two-neutron quasiparticle structure as the bandhead in both N=150 isotones. © 2012 American Physical Society.