Applicability of shape parameterizations for giant dipole resonance in warm and rapidly rotating nucleiP. Arumugam1, A. Ganga Deb2 and S. K. Patra1
1 Institute of Physics - Sachivalaya Marg, Bhubaneswar 751 005, India
2 Sonepur College - Subarnapur 767017, Orissa, India
received 2 February 2005; accepted in final form 23 March 2005
published online 13 April 2005
We investigate how well the shape parameterizations are applicable for studying the giant dipole resonance (GDR) in nuclei, in the low-temperature and/or high-spin regime. The shape fluctuations due to thermal effects in the GDR observables are calculated using the actual free energies evaluated at fixed spin and temperature. The results obtained are compared with Landau theory calculations done by parameterizing the free energy. We exemplify that the Landau theory could be inadequate where shell effects are dominating. This discrepancy at low temperatures and high spins is well reflected in GDR observables and hence insists on exact calculations in such cases.
24.30.Cz - Giant resonances.
21.60.-n - Nuclear structure models and methods.
24.60.-k - Statistical theory and fluctuations.
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