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• W2556040992 abstract "The low-lying collective levels in 224-234 Th isotopes are investigated in the frame work of the interacting boson approximation model (IBA-1). The contour plot of the potential energy surfaces, , shows two wells on the prolate and oblate sides which indicate that all thorium nuclei are deformed and have rotational characters. The levels energy, electromagnetic transition rates B(E1) and B(E2) are calculated. Bending at angular momentum 20 has been observed for 230 Th. Staggering e ect has been calculated and beat patterns are obtained which indicate the existence of an interaction between the ground state band, (GSB), and the octupole negative parity band, (NPB). All calculated values are compared with the available experimental data and show reasonable agreement. The level schemes of 224-234 Th isotopes are characterized by the existence of two bands of opposite parity and lie in the region of octupole deformations. The primary evidence for this octupole deformaton comes from the parity-doublet bands, fast electric transition between the negative and positive parity bands and the low-lying , and excitation energy states. This kind of deformation has o ered a real challenge for nuclear structure models. Even-even thorium nuclei have been studied within the frame work of the interacting boson model [1] and found the properties of the low-lying states can be understood without stable octupole deformation. High spin states in some of these nuclei suggest that octupole deformation develops with increasing spin. A good description of the first excited positive and negative parity bands of nuclei in the rare earth and the actinide region has achieved [2‐4] using the interacting vector boson model. The analysis of the eigen values of the model Hamiltonian reveals the presence of an interaction between these bands. Due to this interaction staggering e ect has reproduced including the beat patterns. Shanmugam-Kamalahran (SK) model [5] for -decay has been applied successfully to 226-232 Th for studying their shapes, deformations of the parent and daughter nuclei as well as the charge distribution process during the decay. Also, a solution of the Bohr Hamiltonian [6] aiming at the description of the transition from axial octupole deformation to octupole vibrations in light actinides Ra and Th is worked out.The parameter free predictions of the model are in good agreement with the experimental data of the two nuclei, where they known to lie closest to the transition from octupole deformation to octupole vibrations in this region. A new frame-work for comparing fusion probabilities in reactions [7] forming heavy elements, Th, eliminates both theoretical and experimental uncertinities, allowing insights into systematic behavior, and revealing previously hidden characteristics in fusion reactions forming heavy elements. It is found that cluster model [8] succeeded in reproducing satisfactorily the properties of normal deformed ground state and super deformed excited bands [9, 10] in a wide range of even-even nuclei, 6 > [11]. The calculated spin dependences [12] to the parity splitting and the electric multi pole transition moments are in agreement with the experimental data. Also, a new formula between half-lives, decay energies and microscopic density-dependent cluster model [13] has been used and the half-lives of cluster radioactivity are well reproduced. A new imperical formula [14], with only three parameters, is proposed for cluster decay half-lives. The parameters of the formula are obtained by making least square fit to the available experimental cluster decay data. The calculated half-lives are compared with the results of the earlier proposed models models, experimental available data and show excellent agreement. A simple description of the cluster decay by suggesting a folding cluster-core interaction based on a self-consistant mean-field model [15]. Cluster decay in even-even nuclei above magic numbers have investigated. Until now scarce informations are available about the actinide region in general and this is due to the experimental di culties associated with this mass region. The aim of the present work is to:" @default.
• W2556040992 created "2016-11-30" @default.
• W2556040992 creator A5028591196 @default.
• W2556040992 date "2008-04-01" @default.
• W2556040992 modified "2023-09-28" @default.
• W2556040992 title "Low-Lying Collective Levels in 224-234 Th Nuclei" @default.
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