Statistical [gamma] decay of the giant dipole resonance in highly excited [sup 46]Ti and [sup 52]Cr

Journal Article · Thu Apr 01 04:00:00 EST 1993 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.47.1436· OSTI ID:6650888

Feldman, G; Snover, K A; Behr, J A; Gossett, C A; Gundlach, J H; Kicinska-Habior, M ^[1]

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1. Nuclear Physics Laboratory, University of Washington, Seattle, Washington, 98195 (United States)

We have measured inclusive [gamma]-ray spectra from the reactions [alpha]+[sup 48]Ti[r arrow][sup 52]Cr and [sup 19]F+[sup 27]Al[r arrow][sup 46]Ti, populating final states at moderate temperature and spin. These spectra were analyzed using a statistical model including giant resonance strength functions in the [gamma]-decay width. The parameters of the giant dipole resonance (GDR) strength function were varied to fit the data. Two different level-density formulations were utilized---one (Puehlhofer) in which the level-density parameters were adjusted to obtain the best overall fit to the data, and the other (Reisdorf) which contained no free parameters. While the magnitudes of the extracted GDR parameters differed in the two cases, their dependence on final-state energy was similar. The GDR energy was observed to be nearly constant with the final-state energy, and the GDR strength exhausted nearly a full [ital E]1 sum rule. In the [alpha]+[sup 48]Ti reaction, the GDR width was observed to increase slightly with increasing bombarding energy. In the [sup 19]F+[sup 27]Al reaction, a pronounced GDR width increase was observed with increasing bombarding energy and was attributed to an increase in compound nucleus spin. These results are consistent with current calculations based on the rotating liquid-drop model and with recent experimental reports.

• OSTI ID: 6650888
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 47:4; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA REACTIONS
ALUMINIUM 27 TARGET
ANGULAR MOMENTUM
CHARGED-PARTICLE REACTIONS
CHROMIUM 52
CHROMIUM ISOTOPES
COMPOUND NUCLEI
DECAY
EVEN-EVEN NUCLEI
FLUORINE 19 REACTIONS
GAMMA DECAY
GIANT RESONANCE
HEAVY ION REACTIONS
INTERMEDIATE MASS NUCLEI
ISOTOPES
LIQUID DROP MODEL
MATHEMATICAL MODELS
NUCLEAR DECAY
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEAR TEMPERATURE
NUCLEI
PARTICLE PROPERTIES
RESONANCE
SPIN
STABLE ISOTOPES
STATISTICAL MODELS
TARGETS
TITANIUM 46
TITANIUM 48 TARGET
TITANIUM ISOTOPES