Learning the structure of giant resonances from their $\gamma$-decay

Abstract

The direct $\gamma$-decays of the giant dipole resonance (GDR) and the giant quadrupole resonance (GQR) of ${}^{208}$Pb to low-lying states are investigated by means of a microscopic self-consistent model. The model considers effects beyond the linear response approximation. The strong sensitivity of $\gamma$-decay to the isospin of the involved states is proven. By comparing their decay widths, a much larger weight of the $3_1^{-}$ component in the GQR wave function of ${}^{208}$Pb is deduced, with respect to the weight of the $2_1^{+}$ component in the GDR wave function. Thus, we have shown that $\gamma$-decay is a unique probe of the resonance wave functions, and a testground for nuclear structure models.

arXiv comment6 pages, 3 figures

References in corpus (18)

• Nuclear Equation of State from ground and collective excited state properties of nuclei
• From Brueckner Approach to Skyrme-type Energy Density Functional
• A new Skyrme interaction with improved spin-isospin properties
• Extended Theory of Finite Fermi Systems (Collective Vibrations in Closed Shell Nuclei)
• Covariant theory of particle-vibrational coupling and its effect on the single-particle spectrum
• Escape and Spreading Properties of Charge-Exchange Resonances in Bi 208
• Isovector Giant Dipole Resonance from the 3D Time-Dependent Density Functional Theory for Superfluid Nuclei
• Dynamics of nuclear single-particle structure in covariant theory of particle-vibration coupling: from light to superheavy nuclei
• Particle-vibration coupling effect on the $\beta$-decay of magic nuclei
• Fine structure of the isovector giant dipole resonance in 208Pb: Characteristic scales and level densities
• Gamow-Teller response and its spreading mechanism in doubly magic nuclei
• Time-reversed particle-vibration loops and nuclear Gamow-Teller response
• Temperature dependence of nuclear spin-isospin response and beta decay in hot astrophysical environments
• Towards a self-consistent dynamical nuclear model
• Isoscalar monopole and quadrupole modes in Mo isotopes: microscopic analysis
• Microscopic theory of the γ-decay of nuclear giant resonances
• Particle-vibration coupling for giant resonances beyond the diagonal approximation
• Proton decay from the isoscalar giant dipole resonance in ${}^{58}$Ni

Cited by in corpus (2)

• Gamma decay of the ${}^{154}$Sm Isovector Giant Dipole Resonance: Smekal-Raman Scattering as a Novel Probe of Nuclear Ground-State Deformation
• Photoneutron cross section measurements on ${}^{208}$Pb in the Giant Dipole Resonance region