Gamma-ray transitions in $sup 159$Tb following the (n,n') reaction

Energy levels of /sup 159/Tb have been studied from the gamma -ray spectrum produced by the /sup 159/Tb(n, n- gamma ) reaction using a Ge(Li) detector. The spectrum show peaks at 317, 331, 395, 440, and 520 KeV, which do not fit into the existing level scheme of /sup 139/Tb. The possibility that the gamma -ray transitions found at 912, 947, and 976 keV might belong to a 1/2/sup +/ STA411! rotational band is discussed. A gamma ray at 248 keV is interpreted as a transition originating in the recently found 386-keV level. The weak transition from the 429-keV level to the ground state has been detected. Some doublets in the gamma spectrum are discussed. (auth)