Thermal shape fluctuation model study of the giant dipole resonance in Gd152

A. K. Rhine Kumar and P. Arumugam
Phys. Rev. C 92, 044314 – Published 16 October 2015

Abstract

We have studied the giant dipole resonance (GDR) in the hot and rotating nucleus Gd152 within the framework of the thermal shape fluctuation model (TSFM) built on the microscopic-macroscopic calculations of the free energies with a macroscopic approach for the GDR. Our results for GDR cross sections are in good agreement with the experimental values except for a component peaking around 17 MeV, where the data has large uncertainties. Such a component is beyond our description which properly takes care of the splitting of GDR components due to the deformation and Coriolis effects. Around 17 MeV lies the half maximum in experimental cross sections, and hence the extracted GDR widths and deformations (estimated from these widths) turn out to be overestimated and less reliable. Reproducing these widths with empirical formulas could conceal the information contained in the cross sections. Fully microscopic GDR calculations and a more careful look at the data could be useful to understand the GDR component around 17 MeV. We also discuss the occurrence of γ softness in the free energy surfaces of Gd152 and its role on GDR.

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  • Received 9 May 2015
  • Revised 18 August 2015

DOI:https://doi.org/10.1103/PhysRevC.92.044314

©2015 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

A. K. Rhine Kumar* and P. Arumugam

  • Department of Physics, Indian Institute of Technology Roorkee, Uttarakhand 247 667, India

  • *rhinekumar@gmail.com

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Issue

Vol. 92, Iss. 4 — October 2015

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