β Scribed by M. Sugawara; S. Mitarai; H. Kusakari; M. Oshima; T. Hayakawa; Y. Toh; Y. Hatsukawa; J. Katakura; H. Iimura; Y.H. Zhang; M. Sugie; Y. Sato
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High-spin states of 156 Gd have been studied by using the reaction 150 Nd( 13 C, Ξ±3n). The groundstate band, Ξ³ band, and octupole band have been extended up to 26 + , 16 + , and 21 -states respectively. Gamma-ray branchings between E2 decays down the K = 1 -band and E1 decays across to the ground band are discussed on the basis of the Generalized Intensity Relations. It is found that the B(E1)/B(E2) ratios have the maximum value at the intermediate spin. This feature is quite similar to the the case of the lowest octupole K = 0 -band in 238 U and is not yet resolved. Moreover a new band in the spin range of (10, 11) I (20, 21) was observed, whose Ξ³ -rays turned out to be almost identical in energy to the ones found in the isotone 158 Dy.
π SIMILAR VOLUMES
High-spin states of 159 Dy have been studied by using reaction 150 Nd( 13 C, 4n). Two rotational bands based on the configurations Ξ½[521]3/2 and Ξ½[642]5/2 have been extended to 57/2 -and 61/2 + states, respectively. A neutron AB crossing has been observed around hΟ = 0.26 MeV in the Ξ½[521]3/2 band.
The role of the rotating mean field and residual interactions is discussed on the basis of recent experimental interaction matrix elements and distribution of level distances. Based on a careful identification of the rotational bands in four rare-earth nuclei, carried out earlier, most of the intera