Structure and decay properties of spin-dipole giant resonances within a semimicroscopical approach

Details Structure and decay properties of spin-dipole giant resonances within a semimicroscopical approach Structure and decay properties of spin-dipole giant resonances within a semimicroscopical approach

1998-04-30

arxiv.org/abs/nucl-th/9804076v1

Phys.Lett. B447 (1999) 8-14

Physics

Nuclear Physics

Nuclear Theory

15 pages, 4 figures, submitted to Phys. Lett. B

Scientific paper

10.1016/S0370-2693(98)01578-0

A semimicroscopical approach is applied to calculate: (i) strength functions for the charge-exchange spin-dipole giant resonances in the 208Pb parent nucleus; (ii) partial and total branching ratios for the direct proton decay of the resonance in 208Bi. The approach is based on continuum-RPA calculations of corresponding reaction-amplitudes and phenomenological description of the doorway-state coupling to many-quasiparticle configurations. The only adjustable parameter needed for the description is found by comparison of the calculated and experimental total widths of the resonance. Other model parameters used in calculations are taken from independent data. The calculated total branching ratio is found to be in reasonable agreement with the experimental value.

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