Giant dipole resonance and Jacobi transition with exact treatment of fluctuations

Arumugam, P.; Shanmugam, Ganesh; Patra, S. K.

doi:10.1103/physrevc.69.054313

Cited by 21 publications

(56 citation statements)

References 49 publications

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“…For deformation energy calculations, we adopt a formalism based on the finite temperature Nilsson-Strutinsky method [13], which is extended to include thermal pairing. Regarding Strutinsky's (microscopic-macroscopic) prescription [41], the total free energy (F TOT ) at a fixed deformation is calculated by using the expression…”

Section: A Finite Temperature Nilsson-strutinsky Methodsmentioning

confidence: 99%

“…with the last term included to give better plateaus conditions [13]. Here f (x) is the averaging function given by …”

Section: A Finite Temperature Nilsson-strutinsky Methodsmentioning

confidence: 99%

“…In such a case there could be numerical uncertainties at very low T ( 0.2 MeV). To avoid such problems it would be nice to extend the maximum term approximation method [13,53] to include pairing. The quasiparticle occupation numbers resulting from both thermal and pairing effects are given by…”

Section: A Finite Temperature Nilsson-strutinsky Methodsmentioning

confidence: 99%

“…Our excited state can have pairs in thermal equilibrium, which replaces the ground-state (13). Hence we can assume that the resultant distribution is the combined effect of these two distributions.…”

Section: B Bcs Approach For Pairingmentioning

confidence: 99%

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Effects of thermal shape fluctuations and pairing fluctuations on the giant dipole resonance in warm nuclei

2015

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Apart from the higher limits of isospin and temperature, the properties of atomic nuclei are intriguing and less explored at the limits of lowest but finite temperatures. At very low temperatures there is a strong interplay between the shell (quantal fluctuations), statistical (thermal fluctuations), and residual pairing effects as evidenced from the studies on giant dipole resonance (GDR).In our recent work [Phys. Rev. C 90, 044308 (2014)], we have outlined some of our results from a theoretical approach for such warm nuclei where all these effects are incorporated along within the thermal shape fluctuation model (TSFM) extended to include the fluctuations in the pairing field. In this article, we present the complete formalism based on the microscopic-macroscopic approach for determining the deformation energies and a macroscopic approach which links the deformation to GDR observables. We discuss our results for the nuclei 97 Tc, 120 Sn, 179 Au, and 208 Pb, and corroborate with the experimental data available. The TSFM could explain the data successfully at low temperature only with a proper treatment of pairing and its fluctuations. More measurements with better precision could yield rich information about several phase transitions that can happen in warm nuclei.

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Section: A Finite Temperature Nilsson-strutinsky Methodsmentioning

confidence: 99%

“…with the last term included to give better plateaus conditions [13]. Here f (x) is the averaging function given by …”

Section: A Finite Temperature Nilsson-strutinsky Methodsmentioning

confidence: 99%

Section: A Finite Temperature Nilsson-strutinsky Methodsmentioning

confidence: 99%

Section: B Bcs Approach For Pairingmentioning

confidence: 99%

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Effects of thermal shape fluctuations and pairing fluctuations on the giant dipole resonance in warm nuclei

2015

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“…For shape calculations we follow the Nilsson-Strutinsky (NS) method extended to high spin and temperature [16]. The total free energy (F TOT ) at fixed deformation is calculated using the expression…”

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confidence: 99%

Applicability of shape parameterizations for giant dipole resonance in warm and rapidly rotating nuclei

Arumugam

Deb²,

Patra

2005

Europhys. Lett.

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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 are well reflected in GDR observables and hence insists on exact calculations in such cases.

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Study of giant dipole resonance in hot rotating light mass nucleus 31P

et al. 2018

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Giant dipole resonance and Jacobi transition with exact treatment of fluctuations

Cited by 21 publications

References 49 publications

Effects of thermal shape fluctuations and pairing fluctuations on the giant dipole resonance in warm nuclei

Effects of thermal shape fluctuations and pairing fluctuations on the giant dipole resonance in warm nuclei

Applicability of shape parameterizations for giant dipole resonance in warm and rapidly rotating nuclei

Study of giant dipole resonance in hot rotating light mass nucleus 31P

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