Abstract
Rotational band structures in 156Dy have been populated via the reactions 148Nd( 12C, 4n) and 124Sn( 36S, 4n) at beam energies of 65 MeV and 155 MeV, respectively. High-spin states ( I ≳ 40 kh) have been observed and a detailed level scheme is presented. Two positive-parity bands have been observed to spins I = 42 and 36. Four negative-parity bands have been identified up to or above spin I = 36. New levels are also observed in octupole and gamma vibrational bands. The band structures are understood in terms of quasiparticle configurations using the cranked-shell model. The second and third i 13 2 neutron alignments, the systematics of the first h 11 2 proton alignments in even-even N = 90 isotones and the observation of a third discontinuity in the lowest energy positive- and negative-parity bands near spin 40 in 156Dy are discussed.
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