Giant dipole resonance width in nuclei near Sn at low temperature and high angular momentum

Journal Article · Fri Feb 15 00:00:00 EST 2008 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.77.024318· OSTI ID:21068123

Bhattacharya, Srijit ^[1]; Mukhopadhyay, S; Pandit, Deepak; Pal, Surajit; Bhattacharya, S; Bhattacharya, C; Banerjee, K; Kundu, S; Rana, T K; Dey, A; Mukherjee, G; Ghosh, T; Gupta, D; Banerjee, S R ^[2]; De, A ^[3]

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1. Darjeeling Government College, Darjeeling-734 101 (India)
2. Variable Energy Cyclotron Centre, 1/AF Bidhan Nagar, Kolkata-700 064 (India)
3. Raniganj Girls' College, Raniganj-713 347 (India)

High energy {gamma} rays in coincidence with low energy yrast {gamma} rays have been measured from {sup 113}Sb, at excitation energies of 109 and 122 MeV, formed by bombarding {sup 20}Ne on {sup 93}Nb at projectile energies of 145 and 160 MeV, respectively, to study the role of angular momentum (J) and temperature (T) over giant dipole resonance (GDR) width ({gamma}). The maximum populated angular momenta for fusion were 67({Dirac_h}/2{pi}) and 73({Dirac_h}/2{pi}), respectively, for the above-mentioned beam energies. The high energy photons were detected using a Large Area Modular BaF{sub 2} Detector Array (LAMBDA) along with a 24-element multiplicity filter. After pre-equilibrium corrections, the excitation energy E* was averaged over the decay steps of the compound nucleus (CN). The average values of temperature, angular momentum, CN mass, etc., have been calculated using the statistical model code CASCADE. Using those average values, results show the systematic increase of GDR width with T, which is consistent with Kusnezov parametrization and the thermal shape fluctuation model (TSFM). The rise of GDR width with temperature also supports the assumptions of adiabatic coupling in the TSFM. But the GDR widths and corresponding reduced plots with J are not consistent with those of the theoretical model at high spins.

• OSTI ID: 21068123
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 77, Issue 2; Other Information: DOI: 10.1103/PhysRevC.77.024318; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANTIMONY 113
C CODES
COMPOUND NUCLEI
CORRECTIONS
COUPLING
DIPOLES
ELECTRONS
EXCITATION
FLUCTUATIONS
GAMMA RADIATION
GIANT RESONANCE
MEV RANGE
NEON 20 REACTIONS
NIOBIUM 93 TARGET
NUCLEAR DECAY
NUCLEAR STRUCTURE
NUCLEAR TEMPERATURE
SPIN
STATISTICAL MODELS
YRAST STATES