Limitation of the linear momentum transfer in sup 4 He+ sup 59 Co collisions

Journal Article · Fri Jun 01 04:00:00 EDT 1990 · Physical Review, C (Nuclear Physics); (USA)

DOI:https://doi.org/10.1103/PhysRevC.41.2605· OSTI ID:6847942

Skulski, W; Jastrzebski, J ^[1]; Singh, P P; Chen, Q; Fatyga, M ^[2]

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1. Heavy Ion Laboratory, Warsaw University, 02-097 Warsaw, Poland (USA)
2. Indiana University Cylcotron Facility, Bloomington, Indiana 47405 (USA)

Recoil range distributions for the {sup 4}He+{sup 59}Co radioactive reaction products were measured with the differential recoil-range method at 90, 150, and 200-MeV bombarding energies. Mean recoil velocities and second moments of recoil-velocity distributions were determined for 16 residual nuclei. The second moment is an increasing function of the mass difference {Delta}{ital A} between the compound nucleus and residual nucleus; it may be explained by a statistical particle evaporation from a hot, intermediate reaction product. The mean recoil velocity for heavier residual nuclei is an increasing function of {Delta}{ital A}. For lighter products the mean velocity saturates at a common level, independent of the mass difference and bombarding energy. The saturation is associated with slowly rising excitation energy in the most central {sup 4}He+{sup 59}Co collisions. Complete fusion ceases to be the dominating reaction mechanism for bombarding energies larger than about 30 MeV/nucleon.

• OSTI ID: 6847942
• Journal Information: Physical Review, C (Nuclear Physics); (USA), Journal Name: Physical Review, C (Nuclear Physics); (USA) Vol. 41:6; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACCELERATORS
ALPHA REACTIONS
CHARGE DISTRIBUTION
CHARGED-PARTICLE REACTIONS
COBALT 59 TARGET
COMPOUND-NUCLEUS REACTIONS
CROSS SECTIONS
CYCLIC ACCELERATORS
CYCLOTRONS
ENERGY RANGE
EVAPORATION MODEL
ISOCHRONOUS CYCLOTRONS
IU CYCLOTRON
LINEAR MOMENTUM TRANSFER
MASS DIFFERENCE
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 10-100
MEV RANGE 100-1000
MOMENTUM TRANSFER
NUCLEAR MODELS
NUCLEAR REACTIONS
PARTICLE PROPERTIES
RECOILS
TARGETS