2015/04/06 by Arvind Kumar, A. K. Rhine Kumar, P. Arumugam +2 · 16 citations
Chemistry · Physics and Astronomy · #Advanced NMR Techniques and Applications #Atomic physics #Condensed matter physics #Dipole #Formalism (music) #Giant resonance #Nuclear physics research studies #Observable #Pairing #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Resonance (particle physics) #Statistical fluctuations #Statistical physics #Thermal #Thermal fluctuations #Thermodynamics #nucl-th
paper · pdf · doi:10.1103/physrevc.91.044305
published in Physical Review C 91(4) (American Institute of Physics) · 35 pages, 12 figures, Accepted for publication in Physical Review C
arxiv created 2015/04/06 · openalex publication_date 2015/04/07 · arxiv updated 2015/04/28 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Apart from the higher limits of isospin and temperature, the properties of atomic nuclei are intriguing and less explored at the limits of lowest but finite temperatures. At very low temperatures there is a strong interplay between the shell (quantal fluctuations), statistical (thermal fluctuations), and residual pairing effects as evidenced from the studies on giant dipole resonance (GDR). In our recent work [Phys. Rev. C 90, 044308 (2014)], we have outlined some of our results from a theoretical approach for such warm nuclei where all these effects are incorporated along within the thermal shape fluctuation model (TSFM) extended to include the fluctuations in the pairing field. In this article, we present the complete formalism based on the microscopic-macroscopic approach for determining the deformation energies and a macroscopic approach which links the deformation to GDR observables. We discuss our results for the nuclei 97Tc,120Sn,179Au, and 208Pb, and corroborate with the experimental data available. The TSFM could explain the data successfully at low temperature only with a proper treatment of pairing and its fluctuations. More measurements with better precision could yield rich information about several phase transitions that can happen in warm nuclei.