Finite-temperature relativistic nuclear field theory: an application to the dipole response

Abstract

Nuclear response theory beyond the one-loop approximation is formulated for the case of finite temperature. For this purpose, the time blocking approximation to the time-dependent part of the in-medium nucleon-nucleon interaction amplitude is adopted for the thermal (imaginary-time) Green's function formalism. We found that introducing a soft blocking, instead of a sharp blocking at zero temperature, brings the Bethe-Salpeter equation to a single frequency variable equation also at finite temperatures. The method is implemented self-consistently in the framework of Quantum Hadrodynamics and designed to connect the high-energy scale of heavy mesons and the low-energy domain of nuclear medium polarization effects in a parameter-free way. In this framework, we investigate the temperature dependence of dipole spectra in the even-even nuclei ${}^{48}$Ca, ${}^{120}$Sn and ${}^{132}$Sn with a special focus on the giant dipole resonance's width problem and on the low-energy dipole strength distribution.

Article; 5 pages, 2 figures

References in corpus (10)

• Isospin Character of the Pygmy Dipole Resonance in 124Sn
• Relativistic quasiparticle time blocking approximation. Dipole response of open-shell nuclei
• Covariant theory of particle-vibrational coupling and its effect on the single-particle spectrum
• Particle-vibration coupling within covariant density functional theory
• Low-lying dipole response in the Relativistic Quasiparticle Time Blocking Approximation and its influence on neutron capture cross sections
• Relativistic quasiparticle time blocking approximation. II. Pygmy dipole resonance in neutron-rich nuclei
• Low-energy dipole strength in 112,120Sn
• Population of dipole states via isoscalar probes: the splitting of pygmy dipole resonance in ${}^{124}$Sn}
• Fragmentation of spin-dipole strength in ${}^{90}$Zr and ${}^{208}$Pb
• Multipole excitations in hot nuclei within the finite temperature quasiparticle random phase approximation framework

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