Abstract
High-spin states in 169Re have been investigated by means of in-beam γ-ray spectroscopy techniques with the 144Sm(28Si, 1p2nγ)169Re reaction. X-γ and γ-γ-t coincidences, γ-ray anisotropies, and DCO ratios were measured. A strongly coupled band based on the 9/2-[514] Nilsson state and a decoupled band built on the h9/2 intruder proton orbital (nominally 1/2-[541]) have been established. The AB neutron crossings are observed at ω = 0.23 and 0.27 MeV for the 9/2-[514] and 1/2-[541] bands, respectively. The 9/2-[514] band in 169Re shows the largest signature splitting at low spin among the odd-mass Re isotopes. Band properties of the AB neutron crossing frequencies, alignment gains, and signature splittings are discussed, and compared with those in the heavier odd-A Re isotopes. Additionally, a three-quasipariticle band is observed, and the π9/2 -[514] ⊗ νAE configuration is proposed tentatively.
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