Giant dipole resonance width and the universality of the Critical Temperature included Fluctuation Model

2013/11/14 by Deepak Pandit, Pandit, Deepak, Srijit Bhattacharya +13
Physics and Astronomy · #FOS: Physical sciences #Nuclear Experiment (nucl-ex) #Nuclear Theory (nucl-th) #nucl-ex #nucl-th

paper · pdf · doi:10.48550/arxiv.1311.3392

6 pages, 7 Figures, Accepted for publication in Phys. Rev. C

arxiv created 2013/11/14 · arxiv updated 2013/11/15

Abstract

The universality of the Critical Temperature included Fluctuation Model (CTFM) in explaining the evolution of the giant dipole resonance (GDR) width as a function of angular momentum is examined in the light of recent experimental data on ¹⁴⁴Sm and ¹⁵²Gd. We compare both the data sets with the phenomenological formula based on the CTFM and the thermal shape fluctuation model (pTSFM). The CTFM describes both the data sets reasonably well using the actual ground state GDR width (Γ₀) values, whereas, the pTSFM describes the ¹⁴⁴Sm data well but is unable to explain the ¹⁵²Gd data using a single value of Γ₀ for two excitation energies. These interesting results clearly indicate that the phenomenological CTFM can be used universally to describe the evolution of the GDR width with both angular momentum and temperature in the entire mass region. Moreover, it should provide new insights into the modification of the TSFM.

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