Characteristics of Pygmy and Giant Resonances within a Microscopic Model for Taking into Account Complex Configurations: Formalism

Expressions for describing characteristics of pygmy dipole and giant multipole resonances (PDR and GMR, respectively) were obtained within the microscopic model developed in [ 1 ] for taking into account complex configurations. This was done via formulating an equation for the density matrix and der...

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Bibliographic Details
Published in:Physics of atomic nuclei 2022-10, Vol.85 (5), p.425-433
Main Authors: Kamerdzhiev, S. P., Shitov, M. I.
Format: Article
Language:English
Subjects:
Configurations
Dipoles
Fine structure
Multipoles
NUCLEI/Theory
Particle and Nuclear Physics
Phonons
Physics
Physics and Astronomy
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Summary:Expressions for describing characteristics of pygmy dipole and giant multipole resonances (PDR and GMR, respectively) were obtained within the microscopic model developed in [ 1 ] for taking into account complex configurations. This was done via formulating an equation for the density matrix and deriving an expression for the polarization operator. The results obtained in this way make it possible to calculate the energies and excitation probabilities for PDR and GMR levels, including their fine structure. A comparison of the present approach with the well-known two-phonon model based on replacing a particle–hole pair by a phonon revealed a significant distinction between these two approaches.
ISSN:1063-7788
1562-692X
DOI:10.1134/S1063778822050052