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Iouldashbaeva, E.; Libert, J.; Quentin, P.; Girod, M.
Centre d'Etudes Nucleaires, Bordeaux-1 Univ., 33 Gradignan (France)
Report of activity, 1995 - 19961997
Centre d'Etudes Nucleaires, Bordeaux-1 Univ., 33 Gradignan (France)
Report of activity, 1995 - 19961997
AbstractAbstract
[en] The formalism of time dependent Hartree-Fock-Bogolyubov adiabatic approximation (ATDHFB) has been studied in the most general case. The adiabatic path is approached by the solutions of the static Hartree-Fock-Bogolyubov under an even time reversal constraint (corresponding to different mean values of the Q operator). The time reversal odd part of the corresponding motion equations can be expressed under the form of a HFB variational problem submitted to two even and odd time reversal constraints, generalizing an earlier study without pairing correlations. The time reversal odd constraint entails occurrence of normal and non-normal density < Q> derivatives of the static solutions. Starting from explicit solutions of the linear response to the odd constraint (i.e by neglecting the effects of rearrangement of the odd part of the HFB field) we have obtained a compact formula for the adiabatic mass parameters generalizing the Inglis-Beleayev mass formulae. Numerical calculations for the Inglis-Beleayev mass parameters derived from our formalism were carried out with Gogny D1 for several nuclei for the quadrupolar modes (β, γ modes and their coupling). In contrast with the case of parameters obtained with mass formulae using sum rules, our mass parameters present large fluctuations especially in the regions where the pairing vanishes. Although, generally, the spectroscopic consequences of these fluctuations are negligible, we have evidenced physical situations where they become of capital importance for a good description of the phenomena (spontaneous fission lifetime in the actinide region and width of the collective wave functions of the superdeformed states in the region of rare earths
Original Title
Parametres de masse et formalisme de Hartree-Fock Bogolyubov dependant du temps a l'approximation adiabatique
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Aguer, Pierre (Centre d'Etudes Nucleaires, Bordeaux-1 Univ., 33 Gradignan (France)); Centre d'Etudes Nucleaires, Bordeaux-1 Univ., 33 Gradignan (France); 198 p; Jun 1997; p. 95; 2 refs.
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Report
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Progress Report
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