Rotational bands in Re-169

The excited states of Re-169 have been investigated by means of in-beam gamma-ray spectroscopy techniques with, the Sm-144 (Si-28, 1p2ngamma) Re-169 reaction. X-gamma and gamma-gamma-t coincidences, DCO ratios and intra-band B(M1)/B(E2) ratios were measured. A strongly coupled band based on the 9/2(-) [514] Nilsson state and a decoupled band built on the h(9/2), intruder proton orbital (nominally 1/2(-) [54]1) have been established. Their configurations are proposed on the basis of B (M1)/B (E2) ratios and by comparing the band properties with known bands in neighboring odd-proton nuclei. The neutron AB crossings are observed at (h) over bar omega = 0.23 and 0.27 MeV for the pi9/2(-) [514] and pi1/2(-) [ 541] bands, respectively. Band properties of the neutron AB crossing frequencies, alignment gains and signature splittings are discussed, and compared with those in the heavier odd-A Re isotopes,