Inclusive neutron cross sections at forward angles from Nb-Nb and Au-Au collisions at 800 MeV/nucleon

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

DOI:https://doi.org/10.1103/PhysRevC.42.1068· OSTI ID:6279000

Madey, R; Zhang, W; Anderson, B D; Baldwin, A R; Elaasar, M; Flanders, B S; Keane, D; Pairsuwan, W; Varga, J; Watson, J W ^[1]; Westfall, G D ^[2]; Hartnack, C; Stoecker, H ^[3]; Frankel, K ^[4]

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1. Kent State University, Kent, OH (USA)
2. Michigan State University, East Lansing, MI (USA)
3. Institut fuer Theoretische Physik, J. W. Goethe Universitaet, D-6000 Frankfurt (Federal Republic of Germany)
4. Research Medicine and Radiation Biology Division, Lawrence Berkeley Laboratory, Berkeley, CA (USA)

Inclusive neutron spectra were measured at 0{degree}, 4{degree}, 8{degree}, 15{degree}, 30{degree}, and 42{degree} from Nb-Nb and Au-Au collisions at 800 MeV/nucleon. A peak that originates from neutron evaporation from the projectile appears in the spectra at angles out to 8{degree}. The shapes and magnitudes of the spectra are compared with those calculated from models of nucleus-nucleus collisions. The differential cross sections for Au-Au collisions are about four times those for Nb-Nb collisions. The predictions of the Vlasov-Uehling-Uhlenbeck (VUU) and QMD theories agree with the angular distributions of the differential cross sections except at small angles; the VUU prediction overestimates the angular distributions from a few degrees to about 20{degree}, whereas the QMD prediction underestimates the angular distributions below 8{degree}. The Firestreak model overestimates the angular distribution for Nb-Nb collisions and underestimates it for Au-Au collisions. Also, the VUU and QMD models agree with the measured double-differential cross sections in more angular and energy regions than the Firestreak and intranuclear cascade models; however, none of the models can account for the peaks at small angles ({theta}{le}15{degree}).

• DOE Contract Number: FG02-89ER40531; AC03-76SF00098
• OSTI ID: 6279000
• Journal Information: Physical Review, C (Nuclear Physics); (USA), Journal Name: Physical Review, C (Nuclear Physics); (USA) Vol. 42:3; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
CHARGED-PARTICLE REACTIONS
COMPOUND-NUCLEUS REACTIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
DISTRIBUTION
EMISSION
ENERGY RANGE
EQUATIONS
EQUATIONS OF STATE
EVAPORATION MODEL
GEV RANGE
GEV RANGE 10-100
GEV RANGE 100-1000
GOLD 197 REACTIONS
GOLD 197 TARGET
HEAVY ION REACTIONS
INCLUSIVE INTERACTIONS
INTERACTIONS
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
NEUTRON EMISSION
NIOBIUM 93 REACTIONS
NIOBIUM 93 TARGET
NUCLEAR CASCADES
NUCLEAR FIREBALL MODEL
NUCLEAR MODELS
NUCLEAR REACTIONS
PARTICLE INTERACTIONS
PLASTIC SCINTILLATION DETECTORS
RADIATION DETECTORS
SCINTILLATION COUNTERS
SOLID SCINTILLATION DETECTORS
TARGETS
TIME-OF-FLIGHT METHOD