Probing the critical behavior in the evolution of GDR width at very low temperatures in A~100 mass region

Balaram Dey; Debasish Mondal; Deepak Pandit; S. Mukhopadhyay; Surajit Pal; Srijit Bhattacharya; A. De; K. Banerjee; N. Dinh Dang; N. Quang Hung; S. R. Banerjee

doi:10.1016/j.physletb.2014.02.007

arXiv · 1402.7210

Probing the critical behavior in the evolution of GDR width at very low temperatures in A~100 mass region

Balaram Dey·Debasish Mondal·Deepak Pandit·S. Mukhopadhyay·Surajit Pal·Srijit Bhattacharya·A. De·K. Banerjee·N. Dinh Dang·N. Quang Hung·S. R. Banerjee

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Abstract

The influence of giant dipole resonance (GDR) induced quadrupole moment on GDR width at low temperatures is investigated experimentally by measuring GDR width systematically in the unexplored temperature range $T$=0.8-1.5 MeV, for the first time, in $A$ $\sim$ 100 mass region. The measured GDR widths, using alpha induced fusion reaction, for $^{97}$Tc confirm that the GDR width remains constant at the ground state value up to a critical temperature and increases sharply thereafter with increase in $T$. The data have been compared with the adiabatic Thermal Shape Fluctuation Model (TSFM), phenomenological Critical Temperature Fluctuation Model (CTFM) and microscopic Phonon Damping Model (PDM). Interestingly, CTFM and PDM give similar results and agree with the data, whereas the TSFM differs significantly even after incorporating the shell effects.

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Balaram Dey, Debasish Mondal, Deepak Pandit, S. Mukhopadhyay, Surajit Pal, Srijit Bhattacharya, A. De, K. Banerjee, N. Dinh Dang, N. Quang Hung, S. R. Banerjee. 2014-02-28. Probing the critical behavior in the evolution of GDR width at very low temperatures in A~100 mass region. https://doi.org/10.1016/j.physletb.2014.02.007

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