Space-time evolution of the reactions sup 14 N+ sup 27 Al, sup 197 Au at E / A =75 MeV and sup 129 Xe+ sup 27 Al, sup 122 Sn at E / A =31 MeV probed by two-proton

Journal Article · Mon Apr 01 04:00:00 EST 1991 · Physical Review, C (Nuclear Physics); (USA)

DOI:https://doi.org/10.1103/PhysRevC.43.1804· OSTI ID:5771493

Gong, W G; Gelbke, C K; Bauer, W; Carlin, N; de Souza, R T; Kim, Y D; Lynch, W G; Murakami, T; Poggi, G; Sanderson, D P; Tsang, M B; Xu, H M ^[1]; Fields, D E; Kwiatkowski, K; Planeta, R; Viola, Jr, V E; Yennello, S J ^[2]; Pratt, S ^[3]

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1. National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan (USA) Department of Physics Astronomy, Michigan State University, East Lansing, Michigan 48824 (USA)
2. Indiana University Cyclotron Facility, Indiana University, Bloomington, Indiana 47405 (USA)
3. Department of Physics, University of Wisconsin, Madison, Wisconsin 53706 (USA)

Two-proton correlation functions have been measured at {theta}{sub lab}{approx}25{degree} for the forward kinematics'' reactions {sup 14}N+{sup 27}Al, {sup 14}N+{sup 197}Au at {ital E}/{ital A}=75 MeV, for the inverse kinematics'' reaction {sup 129}Xe+{sup 27}Al at {ital E}/{ital A}=31 MeV, and for the nearly symmetric reaction {sup 129}Xe+{sup 122}Sn at {ital E}/{ital A}=31 MeV. For the reactions at 75 MeV per nucleon, the correlation functions exhibit pronounced maxima at relative proton momenta, {ital q}{approx}20 MeV/{ital c}, and minima at {ital q}{approx}0 MeV/{ital c}. These correlations indicate emission from fast, nonequilibrium processes. They are analyzed in terms of standard Gaussian source parametrizations and compared to microscopic simulations performed with the Boltzmann-Uehling-Uhlenbeck equation. For the reactions at 31 MeV per nucleon, the two-proton correlation functions do not exhibit maxima at {ital q}{approx}20 MeV/{ital c}, but only minima at {ital q}{approx}0 MeV/{ital c}. These correlations indicate emission on a slower time scale. They can be reproduced by calculations based on the Weisskopf formula for evaporative emission from fully equilibrated compound nuclei. For all reactions, the measured longitudinal and transverse correlation functions are very similar, in agreement with theoretical predictions.

• DOE Contract Number: FG02-88ER40404
• OSTI ID: 5771493
• Journal Information: Physical Review, C (Nuclear Physics); (USA), Journal Name: Physical Review, C (Nuclear Physics); (USA) Vol. 43:4; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALUMINIUM 27 TARGET
CHARGED-PARTICLE REACTIONS
CORRELATION FUNCTIONS
DATA
EXPERIMENTAL DATA
FUNCTIONS
GOLD 197 TARGET
HEAVY ION REACTIONS
INELASTIC SCATTERING
INFORMATION
NITROGEN 14 REACTIONS
NUCLEAR REACTIONS
NUMERICAL DATA
PARTICLE KINEMATICS
SCATTERING
TARGETS
TIN 122 TARGET
XENON 129 REACTIONS