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

Arumugam, P.; Deb, A. Ganga; Patra, S. K.

doi:10.1209/epl/i2005-10012-8

Cited by 9 publications

(12 citation statements)

References 34 publications

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“…Our region of interest in this work is the low-T one where the earlier TSF calculations are not yielding satisfactory results [35]. As a first step, we include the pairing correlations in the TSF calculations within the BCS approach, but with free energies corresponding to the GCE approach [14].…”

Section: Resultsmentioning

confidence: 99%

“…[13,35,40,60], but here η is redefined to include the effect of pairing. From these GDR frequencies (energies), the GDR cross sections are constructed as a sum of Lorentzians given by…”

Section: Macroscopic Approach For Gdrmentioning

confidence: 99%

“…However, in Ref. [35] it was reported that a proper inclusion of shell effects leads to an increase in GDR width in 179 Au and there is a need for an exact treatment of the pairing fluctuations (along with the TSF) to overcome this discrepancy. Subsequently, the importance of considering pairing in the TSFM has been reported in Refs.…”

Section: Introductionmentioning

confidence: 99%

“…In the present work we discuss a proper TSFM that is also applicable at low T . The success of a modified pairing approach [11,16,26,31,33] at low-T and that of the TSFM elsewhere [13,27,35,[38][39][40] have motivated us to consider a combination of pairing correlations within the TSFM. Preliminary results of our approach can be found in Refs.…”

Section: Introductionmentioning

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: Resultsmentioning

confidence: 99%

“…[13,35,40,60], but here η is redefined to include the effect of pairing. From these GDR frequencies (energies), the GDR cross sections are constructed as a sum of Lorentzians given by…”

Section: Macroscopic Approach For Gdrmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

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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“…We employ the TSFM built on Nilsson-Strutinsky (NS) calculations with a macroscopic approach to GDR. Our formalism is well tested to explain several GDR observations at higher T and I [5,[28][29][30]. In a recent work [18,19], the GDR properties of hot and rotating 144 Sm were studied and the experimental data were very well explained with the TSFM results.…”

Section: Introductionmentioning

confidence: 90%

Thermal shape fluctuation model study of the giant dipole resonance in $^{152}$Gd

Kumar,

Arumugam

2015

Preprint

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We have studied the giant dipole resonance (GDR) in the hot and rotating nucleus 152 Gd within the framework of thermal shape fluctuation model (TSFM) built on the microscopic-macroscopic calculations of the free energies with a macroscopic approach for the GDR. Our results for GDR cross sections are in good agreement with the experimental values except for a component peaking around 17 MeV where the data has large uncertainties. Such a component is beyond our description which properly takes care of the splitting of GDR components due to the deformation and Coriolis effects. Around this 17 MeV lies the half maximum in experimental cross sections, and hence the extracted GDR widths and deformations (estimated from these widths) turn out to be overestimated and less reliable. Reproducing these widths with empirical formulae could conceal the information contained in the cross sections. Fully microscopic GDR calculations and a more careful look at the data could be useful to understand the GDR component around 17 MeV. We also discuss the occurrence of γ-softness in the free energy surfaces of 152 Gd and its role on GDR.

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Decoupling the effect of temperature on GDR widths in excited compound nucleus¹⁴⁴Sm

Mukul¹,

Roy²,

Sugathan³

et al. 2014

J. Phys. G: Nucl. Part. Phys.

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We measured giant dipole resonance (GDR) γ-rays in the 28 Si + 116 Cd reaction at ∼105 and 120 MeV excitation energies. The resonance widths were extracted as a function of temperature at different angular momentum values to decouple the effect of these two variables on resonance widths. The high energy GDR γ-rays from the decay of compound nucleus (CN) 144 Sm were measured using a large NaI(Tl) detector in coincidence with a sum-spin multiplicity filter. The experimental data were analyzed under the framework of statistical decay of CN. The GDR cross sections were also calculated with a thermal shape fluctuation model (TSFM), which incorporates the temperature and spin dependent shell corrections within the Nilsson-Strutinsky approach. The GDR widths were extracted in the temperature range 1.5-2.2 MeV. The measured widths indicate that the increase of GDR widths with temperature at different average spin values follows a similar trend and is borne out by theoretical calculations. Present calculation shows that TSFM satisfactorily reproduces the GDR cross section as well as widths in the temperature range 1-2.2 MeV over a wide range of angular momentum.

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

Cited by 9 publications

References 34 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

Thermal shape fluctuation model study of the giant dipole resonance in $^{152}$Gd

Decoupling the effect of temperature on GDR widths in excited compound nucleus¹⁴⁴Sm

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

Cited by 9 publications

References 34 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

Thermal shape fluctuation model study of the giant dipole resonance in $^{152}$Gd

Decoupling the effect of temperature on GDR widths in excited compound nucleus144Sm

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Decoupling the effect of temperature on GDR widths in excited compound nucleus¹⁴⁴Sm