Rapid increase in prescission GDR {gamma}-ray emission with energy

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:192520

Hofman, D J; Back, B B ^[1]; Paul, P ^[2]

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1. Argonne National Lab., IL (United States)
2. State Univ. of New York, Stony Brook, NY (United States). Dept. of Physics

A rapid increase in the emission of prescission giant dipole resonance (GDR) {gamma}-rays with bombarding energy is observed in excited Th and Cf nuclei formed in the reactions {sup 16}O+{sup 20B}Pb and {sup 32}S+{sup nat}W,{sup 208}Pb. This increase begins around E{sub exc} = 40 MeV for the {sup 16}O+{sup 208}Pb reaction and E{sub exc} = 70 MeV for the {sup 32}S-induced reactions. The excess {gamma}-ray yield above these thresholds cannot be described within the standard statistical model. Statistical model calculations which include a temperature dependent nuclear dissipation are able to reproduce simultaneously the observed GDR {gamma}-ray spectra and recently measured evaporation residue across sections.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 192520
• Report Number(s): ANL/PHY/CP--87651; CONF-9506131--1; ON: DE96004821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CALIFORNIUM
CROSS SECTIONS
ENERGY DEPENDENCE
FISSION
GAMMA RADIATION
GIANT RESONANCE
GIANT RESONANCE MODEL
LEAD 208 TARGET
OXYGEN 16 REACTIONS
PHOTON EMISSION
SULFUR 32 REACTIONS
THORIUM