Mechanisms for light charged particle production in the reactions 905-and 1030-MeV sup 121 Sb + sup 27 Al and 550 and 750 MeV sup 86 Kr + sup 63 Cu

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 1989

OSTI ID:5845516

Parker, W E

Emission of {sup 4}He and {sup 1}H has been studied in the reactions 905 and 1030 MeV {sup 121}Sb {plus} 27Al and 550 and 750 MeV {sup 86} Kr {plus} {sup 63}Cu. Measurements of the energy spectra and angular distributions were made for the light charged particles in the inclusive mode, in coincidence with heavy fragments from DIR and FF reactions, and in coincidence with other light charged particles ({sup 4}He/{sup 1}H). These reactions were chosen to facilitate the study of entrance channel effects. The emission of {sup 4} He and {sup 1}H detected in coincidence with a heavy fragment from a DIR or FF reaction can be well described by three sources: the detected fragment, the undetected partner fragment, and the composite system prior to scission. Particles not described by these three sources are attributed to near-scission emission. The multiplicities determined for the {sup 1}H ana {sup 4}He in coincidence with these fragments are all much less than one. For both {sup 121}Sb {plus} {sup 27} Al reactions, and for the 550 MeV {sup 86}Kr {plus} {sup 63}Cu reaction, the particle-particle coincidences are dominated by reactions that lead to evaporation residues (over 80% of all particle-particle reactions are from ERs). For the 750 MeV {sup 86}Kr {plus} {sup 63} Cu reaction, 50% of the alphas and protons come from reactions that lead to evaporation residues. These particle-particle correlations arise from cross sections that are subsets of the total evaporation residue cross sections, {sigma}{sub ER}. The particle chain lengths that are observed for the four reactions are {approximately}2. For the 1030 MeV {sup 121}Sb {plus} {sup 27}Al and the 550 MeV {sup 86}Kr {plus} {sup 63} Cu reactions, an entrance channel effect is observed in the size of the subset cross sections. For the asymmetric entrance channels the subset cross sections are smaller than the {sigma}{sub ER}.

• Research Organization: Carnegie-Mellon Univ., Pittsburgh, PA (USA)
• OSTI ID: 5845516
• Country of Publication: United States
• Language: English

Related Subjects

651420* -- Nuclear Properties & Reactions
A=20-38
Experimental
651620 -- Nuclear Properties & Reactions
A=59-89
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA PARTICLES
ALUMINIUM 27 TARGET
ANGULAR DISTRIBUTION
BARYONS
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
COPPER 63 TARGET
DISTRIBUTION
ELEMENTARY PARTICLES
ENERGY RANGE
ENERGY SPECTRA
FERMIONS
HADRONS
HEAVY ION REACTIONS
KRYPTON 86 REACTIONS
MEV RANGE
MEV RANGE 100-1000
NUCLEAR FRAGMENTATION
NUCLEAR FRAGMENTS
NUCLEAR REACTIONS
NUCLEONS
PRECOMPOUND-NUCLEUS EMISSION
PROTONS
SPECTRA
TARGETS