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High-spin states up to I~22, 37/2 and 24ћ have been studied in the 134,135Ba (Z=56) and 120Te (Z=52) nuclei respectively. The reaction used to populate 134Ba and 135Ba high-spin states was 124Sn(14C,4n and 3n) at a beam energy of 57 and 50 MeV respectively. High-spin states in 120Te were populated using the 110Pd(14C,4n) reaction at a beam energy of 64 MeV. Through these reactions and using the FSU y-ray detector array of Compton suppressed Ge detectors, significant extensions to the level schemes for each of these nuclei were made. In 134Ba, a large number of states are observed for the first time beyond the 10+ isomer. The most prominent feature of the 134Ba level scheme is the newly discovered dipole (Δ I=1) band (group P). This structure is interpreted as oblate collective rotational in character with the configuration πg7/2 h11/2υh11/2x1/h11/2-2. Comparisons with neighboring nuclei leading to this interpretation are discussed. Previous to the present study only a handful of gamma-ray transitions had been assigned to 135Ba. In the present work a level scheme with over 25 new transitions and 24 new levels has been constructed for this nucleus. In the 135Ba level scheme the prominent feature is another dipole (ΔI=1) band (group F). This band is interpreted as the 3 quasiparticle configuration πh11/2g7/2x1/h11/2-1. Another interesting structure of this nucleus is the 21/2 level of group K which carries a substantial fraction (14%) of the decay intensity. This long lived level is interpreted as analogous to the 10+ isomeric state in 134Ba. New structures in 120Te have been identified at high spin which indicate a transition to oblate non-collective structure. These observations are consistent with Cranked Nilsson Strutinsky calculations which predict specific favored configurations for high-spin states.
A Dissertation submitted to the Department of Physics in partial fulfillment of the requirements for the degree of Doctor of Philosophy.
Bibliography Note
Includes bibliographical references.
Advisory Committee
Mark A. Riley, Professor Directing Thesis; Sanford Safron, Outside Committee Member; Jorge Piekarewicz, Committee Member; Ingo Wiedenhoever, Committee Member; Oedro Schlottman, Committee Member.
Publisher
Florida State University
Identifier
FSU_migr_etd-3576
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