Sunday, May 19, 2013

1305.3360 (Deepak Pandit et al.)

Giant dipole resonance width as a probe for nuclear deformation at
finite excitation

Deepak Pandit, Balaram Dey, Debasish Mondal, S. Mukhopadhyay, Surajit Pal, Srijit Bhattacharya, A. De, S. R. Banerjee
The systematic study of the correlation between the experimental giant dipole resonance (GDR) width and the average deformation <\beta> of the nucleus at finite excitation is presented for the mass region A ~ 59 to 208. We show that the width of the GDR (\Gamma) and the quadrupole deformation of the nucleus do not follow a linear relation, as predicted earlier, due to the GDR induced quadrupole moment and the correlation also depends on the mass of the nuclei. The different empirical values of <\beta> extracted from the experimental GDR width match exceptionally well with the thermal shape fluctuation model. As a result, this universal correlation between <\beta> and \Gamma provides a direct experimental probe to determine the nuclear deformation at finite temperature and angular momentum in the entire mass region.
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