Critical behavior in the variation of GDR width at low temperature

Abstract

We present the first experimental giant dipole resonance (GDR) width systematics, in the temperature region 0.8 $\sim$ 1.2 MeV for ${}^{201}$Tl, a near Pb nucleus, to investigate the evolution of the GDR width in shell effect & pairing dominated region. The extracted GDR widths are well below the predictions of shell effect corrected thermal shape fluctuation model (TSFM) and thermal pairing included phonon damping model. A similar behavior of the GDR width is also observed for ${}^{63}$Cu measured in the present work and ${}^{119}$Sb, measured earlier. This discrepancy is attributed to the GDR induced quadrupole moment leading to a critical point in the increase of the GDR width with temperature. We incorporate this novel idea in the phenomenological description based on the TSFM for a better understanding of the GDR width systematics for the entire range of mass, spin and temperature.

Accepted for publication in Phys. Lett. B, 7 pages, 4 figures

References in corpus (15)

• Nuclear Ground-State Masses and Deformations
• Critical temperature for quenching of pair correlations
• Scaling Properties of the Giant Dipole Resonance Width in Hot Rotating nuclei
• Photon data shed new light upon the GDR spreading width in heavy nuclei
• Non-Linear Vibrations in Nuclei
• Experimental study of the electric dipole strength in the even Mo nuclei and its deformation dependence
• A realistic technique for selection of angular momenta from hot nuclei: A case study with 4He + 115In \to 119Sb at E_Lab = 35 MeV
• Evidence for the Jacobi shape transition in hot 46Ti
• Couplings between dipole and quadrupole vibrations in tin isotopes
• Extreme nuclear shapes examined via Giant Dipole Resonance lineshapes in hot light mass system
• LAMBDA: Large Area Modular BaF2 Detector Array for the measurement of high energy gamma rays
• Measurement of Giant Dipole Resonance width at low temperature: A new experimental perspective
• Coherent bremsstrahlung and GDR width from 252Cf cold fission
• Shear-Viscosity to Entropy-Density Ratio from Giant Dipole Resonances in Hot Nuclei
• Giant Dipole Resonance Width in near-Sn Nuclei at Low Temperature and High Angular Momentum

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