High-spin states in Lu-166

Five rotational bands with configurations {pi7/2(+)[404] x nu5/(2+)[642]} K = 6, {pi9/2(-) [514] x nu5/2(+)[642]} K = 7, {pi1/2(+)[411]x nu5/2(+) [642 ]} K = 2, {pi1/2(-) [541]x nu5/2(+) [642]} K = 2 and {pi5/2(+) [402] x thet a5/2(+) [642]} K = 5 were populated through the Sm-152 (F-19, 5n) Lu-166 re action at a beam energy of (MeV)-Me-97. The last three bands are identified in the present study. A phase change of level staggering is observed and l ow-spin signature inversion is suggested in the band {pi1/2(-)[541] x nu5/2 (+) [642]} K = 2. The inversion spin 17.5h. (spin at inversion point) of th is band fits well to the systematic Variation trend of inversion spin, incr easing with N and decreasing with Z, for the known pi1/2(-) [541] x nui(13/ 2) bands observed in odd-odd deformed nuclei around A = 170.