Heat partition in the E / A =8. 5 MeV sup 74 Ge+ sup 165 Ho reaction

Journal Article · Thu Mar 01 04:00:00 EST 1990 · Physical Review, C (Nuclear Physics); (USA)

DOI:https://doi.org/10.1103/PhysRevC.41.958· OSTI ID:6915438

Kwiatkowski, K; Planeta, R; Zhou, S H; Viola, V E ^[1]; Breuer, H ^[2]; McMahan, M A ^[3]; Mignerey, A C ^[4]

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1. Department of Chemistry, Indiana University, Bloomington, Indiana 47405 (USA) Indiana University Cyclotron Facility, Indiana University, Bloomington, Indiana 47405 (USA)
2. Department of Physics, University of Maryland, College Park, Maryland 20742 (USA)
3. Accelerator and Fusion Research Division, Lawrence Berkeley Laboratory, Berkeley, California 94720 (USA)
4. Department of Chemistry, University of Maryland, College Park, Maryland 20742 (USA)

The excitation-energy distribution of projectilelike fragments formed in the {ital E}/{ital A}=8.5 MeV {sup 74}Ge+{sup 165}Ho reaction has been obtained by applying a statistical evaporation calculation to the difference between primary fragment mass yields derived from kinematic coincidence measurements and directly measured yields. A gradual transition from approximate equipartition of excitation energy for small energy losses to a division that favors the targetlike fragment for highly damped events is observed, in agreement with previous measurements. For a given energy loss, heat partition is found to correlate with the direction of net nucleon transfer. The variances of the excitation-energy distributions are shown to increase monotonically as a function of energy loss. The average data are compared with predictions of the nucleon exchange transport model. The results suggest that energy-loss mechanisms in addition to nucleon exchange may be important in the early stages of the collision.

• OSTI ID: 6915438
• Journal Information: Physical Review, C (Nuclear Physics); (USA), Journal Name: Physical Review, C (Nuclear Physics); (USA) Vol. 41:3; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651820* -- Nuclear Properties & Reactions
A=150-189
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CHARGED-PARTICLE REACTIONS
COINCIDENCE METHODS
COUNTING TECHNIQUES
DIRECT REACTIONS
DISTRIBUTION FUNCTIONS
EVAPORATION MODEL
FUNCTIONS
GERMANIUM 74 REACTIONS
HEAVY ION REACTIONS
HOLMIUM 165 TARGET
MASS TRANSFER
MATHEMATICAL MODELS
NUCLEAR FRAGMENTATION
NUCLEAR MODELS
NUCLEAR REACTION YIELD
NUCLEAR REACTIONS
STATISTICAL MODELS
TARGETS
TRANSFER REACTIONS
YIELDS