Pion correlations in relativistic heavy ion collisions for three symmetric systems

Journal Article · Sat Jun 01 04:00:00 EDT 1991 · Physical Review, C (Nuclear Physics); (USA)

DOI:https://doi.org/10.1103/PhysRevC.43.2670· OSTI ID:5537126

Chacon, A D; Bistirlich, J A; Bossingham, R R; Bossy, H; Bowman, H R; Clawson, C W; Crowe, K M; Humanic, T J; Justice, M; Kammel, P; Kurck, J M; Ljungfelt, S; Meyer, C A; Petitjean, C; Rasmussen, J O; Stoyer, M A ^[1]; Hashimoto, O ^[2]; McHarris, W C ^[3]; Sullivan, J P; Wolf, K L ^[4] ; Zajc, W A ^[5]

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1. Lawrence Berkeley Laboratory, University of California, Berkeley, CA (USA)
2. Institute for Nuclear Study, University of Tokyo, Tanashi, Tokyo 188 (Japan)
3. Michigan State University, East Lansing, MI (USA)
4. Cyclotron Institute, Texas A M University, College Station, TX (USA)
5. Columbia University, New York, NY (USA)

The method of two-pion interferometry was used to obtain source-size and lifetime parameters for the pions produced in heavy ion collisions. Two acceptances (centered at approximately 0{degree} and approximately 90{degree}, in the center of mass) were used for each of three systems, 1.70 GeV/nucleon {sup 56}Fe+Fe, 1.82 GeV/nucleon {sup 40}Ar+KCl, and 1.54 GeV/nucleon {sup 93}Nb+Nb, allowing a search for dependences on nuclear mass and viewing angle. The correlation functions were calculated by comparing data samples to event-mixed reference samples. The effect of the particle correlations on the reference samples was corrected by weighting the events appropriately to remove the residual correlation effect. The source parameters, in the nucleus-nucleus center-of-mass frame, show an oblate source (i.e., {ital R}{sub {perpendicular}}{gt}{ital R}{sub {parallel}}) for the lighter systems and an approximately spherical source for the heaviest system. The dependence on nuclear mass shows that {ital R}{sub {perpendicular}} is essentially constant (under both viewing angles), whereas {ital R}{sub {parallel}} for the 90{degree} (c.m.) data increases with the nuclear mass. No evidence was found for a dependence of the source size on the pion momentum.

• OSTI ID: 5537126
• Journal Information: Physical Review, C (Nuclear Physics); (USA), Journal Name: Physical Review, C (Nuclear Physics); (USA) Vol. 43:6; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

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653003 -- Nuclear Theory-- Nuclear Reactions & Scattering
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALI METAL COMPOUNDS
ANGULAR DISTRIBUTION
ARGON 40 REACTIONS
BOSE-EINSTEIN STATISTICS
BOSONS
CHARGED-PARTICLE REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CORRELATION FUNCTIONS
DISTRIBUTION
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
FUNCTIONS
GEV RANGE
GEV RANGE 10-100
GEV RANGE 100-1000
HADRONS
HALIDES
HALOGEN COMPOUNDS
HEAVY ION REACTIONS
INTERFEROMETRY
IRON
IRON 56 REACTIONS
LIFETIME
MESONS
METALS
NIOBIUM
NIOBIUM 93 REACTIONS
NUCLEAR REACTIONS
PARTICLE PRODUCTION
PIONS
POTASSIUM CHLORIDES
POTASSIUM COMPOUNDS
PSEUDOSCALAR MESONS
RELATIVISTIC RANGE
TRANSITION ELEMENTS