Elsevier

Nuclear Physics A

Volume 288, Issue 3, 3 October 1977, Pages 376-396
Nuclear Physics A

Fragmentation of giant multipole resonances over two-phonon states in spherical nuclei

https://doi.org/10.1016/0375-9474(77)90338-4Get rights and content

Abstract

A method for the calculation of the strength function photoexcitation of giant multipole resonances in spherical nuclei is presented. The method is developed in the framework of the model based on the quasiparticle-phonon interaction. The one-phonon states are calculated in the random phase approximation. The fragmentation of one-phonon states over two-phonon ones is calculated. The strength function b(Eλ, η) and the positions of giant isovector dipole and isoscalar quadrupole resonances in 90Zr, 120Sn and 124Te are found. The calculations of the transition strengths and positions of these resonances are in reasonable agreement with experiment. The strength function b(E2, η) is calculated for the isovector quadrupole resonance in 90Zr. The description of the lowenerev octupole resonances in 90Zr and 120Sn is in agreement with experiment.

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