The temperature dependence of the width of the giant dipole resonance

Technical Report · Sun Dec 31 04:00:00 EST 1995

DOI:https://doi.org/10.2172/195730· OSTI ID:195730

Ormand, W E ^[1]; Bortignon, P F ^[2]; Broglia, R A ^[2]

---

1. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics
2. Univ. Degli Studi di Milano (Italy). Dipt. di Fisica

A systematic study of the full-width-at-half-maximum (FWHM) of the giant-dipole resonance (GDR) as a function of temperature for the nuclei {sup 120}Sn and {sup 208}Pb confirms the overall theoretical picture of the GDR in hot nuclei; in particular, the role played by large-amplitude thermal fluctuations of the nuclear shape. This is confirmed by the good agreement between theory and experiment achieved over a range of temperatures from 1.25--32 MeV and by the differences in the behavior of the FWHM for {sup 120}Sn and {sup 208}Pb, which can be attributed to the presence of strong shell corrections favoring spherical shapes in {sup 208}Pb that are absent in {sup 120}Sn. Finally, the increase in the FWHM over that expected from thermal averaging at temperatures of the order 3.0 MeV is in accordance with the increase expected from the particle evaporation of the compound system.

• Research Organization: Oak Ridge National Lab., TN (United States); Tennessee Univ., Knoxville, TN (United States). Dept. of Physics
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC05-84OR21400; FG05-93ER40770
• OSTI ID: 195730
• Report Number(s): CONF-9506131--2; ON: DE96005425
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
COMPARATIVE EVALUATIONS
GIANT RESONANCE
LEAD 208
NUCLEAR MODELS
STRENGTH FUNCTIONS
TEMPERATURE DEPENDENCE
THEORETICAL DATA
TIN 120