Rotational Structures In Sn-106 - A New Form Of Band Termination

Two weakly populated rotational bands have been established in Sn-106 from the (Fe(Ni, alpha2p))-Fe-54-Ni-58 reaction at 243 MeV. One of the bands shows evidence of termination. The result is consistent with cranked Nilsson model calculations, which predict band terminations with a smooth and gradual shape change from a prolate collective to an oblate noncollective structure.