Brisure De La Symétrie Su3 Dans La Structure Des 178-186 Os

Résumé: n this memory, we studied details the structure of the osmium nuclei the framework of « IBM » model By using empirical quantities characterizingsu(3) symmetry we concluded that these nuclei are close to this symmetry. The Break of this symmetry was taken into account by introducing a perturbation whose origin is the so(6)limit. « PHINT ». Program was used for the calculation of the energy levels of the three bands, fundamental, y and (3.The electric reduced transition probability theory of was carried out by using « FBEM ». program. Os , within We compared our results with those of H.C.chiang et al. which studied the structure of the osmium nuclei180't88Os within the framework of IBM model by using a mixture of three symmetries u(5), su(3) and so(6). Our results are in perfect agreement with the experimental results compared to those of H.C.chiang et al., which justifies the study of 178-180 the structure of the Os nuclei by the su(3) limit berturbed so(6). 178-180 We calculated excitation energies of the y band of the framework of the model of the triaxial rigid rotor (RTR). The results obtained are in good agreement with the experiment. In spite of its limits, the rigid triaxial rotor model was used to analyze certain experimental data (energy levels and reduced transitions probabilities ) and to carry out some forecasts. Os nuclei, within the While basing itself on the results of A.M.Shirkov et al., we calculated for each nuclei the parameters of the Hamiltonian which gives the same spectrum.

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