High-Spin States in 141Pm

The high-spin states of Pm-141 nucleus have been studied by using in-beam gamma-ray spectroscopy technology through the Te-126(F-19, 4n) reaction at a beam energy of 90 MeV. The previous level scheme has been extended with spin up to 49/2 (h) over bar. Many new levels and transitions are identified. Five collective band structures are observed. Based on systematic comparison with the neighboring nuclei, two bands with strong Delta I = 1 M1 transitions inside the bands are proposed as the oblate bands with gamma similar to-60 degrees, and three bands with large signature splitting have been suggested as the oblate-triaxial deformation with gamma similar to-90 degrees. The characteristics for these bands have been discussed.