Examination of level density prescriptions in the interpretation of high energy gamma-ray spectra

Abstract

High energy $\gamma$-ray spectra measured by our group involving the compound nuclei (CN) ${}^{63}$Cu at excitation energy ($E^{\ast }$) $\sim$ 36 MeV with average angular momentum ($J$) = 12 - 17 $\hslash$, ${}^{97}$Tc at $E^{\ast }\sim$ 29 - 50 MeV with $J$ = 12 - 14 $\hslash$, ${}^{113}$Sb at $E^{\ast }$ = 109 MeV and 121 MeV with $J$ = 49 - 59 $\hslash$ and ${}^{201}$Tl at $E^{\ast }$ = 39.5, 47.5 MeV with $J$ = 18 - 24 $\hslash$ have been analyzed utilizing the level density prescriptions of (i)Ignatyuk, Smirenkin and Tishin (IST), (ii)Budtz-Jorgensen and Knitter (BJK), and (iii) Kataria, Ramamurthy and Kapoor (KRK). These three prescriptions have been tested for correct statistical model description of high energy $\gamma$-rays in the light of extracting the giant dipole resonance (GDR) parameters at low excitation energy and spin where shell effects might play an important role as well as at high excitation energy where shell effects have melted. Interestingly, only the IST level density prescription could explain the high energy $\gamma$-ray spectra with reasonable GDR parameters for all the four nuclei.

arXiv comment9 pages, 10 figure, Accepted for publication in Physical Review C

References in corpus (14)

• The Giant Dipole Resonance as a quantitative constraint on the symmetry energy
• Total and Parity-Projected Level Densities of Iron-Region Nuclei in the Auxiliary Fields Monte Carlo Shell Model
• Scaling Properties of the Giant Dipole Resonance Width in Hot Rotating nuclei
• Critical behavior in the variation of GDR width at low temperature
• Evidence for the Jacobi shape transition in hot 46Ti
• A realistic technique for selection of angular momenta from hot nuclei: A case study with 4He + 115In \to 119Sb at E_Lab = 35 MeV
• 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
• Probing the critical behavior in the evolution of GDR width at very low temperatures in A~100 mass region
• 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 as a probe for nuclear deformation at finite excitation
• Giant Dipole Resonance Width in near-Sn Nuclei at Low Temperature and High Angular Momentum

Cited by in corpus (2)

• Experimental signature of collective enhancement in nuclear level density
• Experimental investigation on the temperature dependence of the nuclear level density parameter