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53, No. 3 September 1999 p. 407 M 1 and E 2 band structures in the Sn-Xe-Ba region R SRINIVASA CHAKRAWARTHY* Institut für Kernphysik, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany Abstract. In the present talk I will discuss some 'rare' aspects of the E 2 band structures and the novel features concerning the dipole bands in this mass region. Reliable and accurate lifetimes have been measured using coincidence recoil distance method. The results of 129 ; 130 Ba will be discussed. In contrast to the predictions of the tilted axis cranking model, the dipole bands in Sb-Xe-Ba nuclei can be nicely described as high-K prolate bands. New data from multi-detector arrays has established extended bands structure, their decay to low lying states have been established and the angular correlation supports the predominant, D I = 1 character. Finally the sensitive measures, i.e. B ( M 1) rates of the tilted axis model are compared with the high-K formula based on 1-dim cranking model. Keywords. Nuclear structure; recoil distance method; cranking model. PACS Nos 21.10.Tg; 23.20.Lv |