Two-pion correlations and multiplicity effects in La on La collisions

Journal Article · Thu Apr 01 04:00:00 EST 1993 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.47.1659· OSTI ID:6610490

Bossy, H; Bistirlich, J A; Bossingham, R R; Chacon, A D; Crowe, K M; Dardenne, Y; Justice, M; Rasmussen, J O; Shihab-Eldin, A A; Stoyer, M A; Wyatt, K D ^[1]; Sullivan, J P; Wolf, K L ^[2]

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1. Lawrence Berkeley Laboratory, University of California, Berkeley, Berkeley, California 94720 (United States)
2. Cyclotron Institute, Texas A M University, College Station, Texas 77843 (United States)

Bose-Einstein correlations of negative pions in heavy ion collisions have been investigated for the reaction [sup 139]La+[sup nat]La[r arrow]2[pi][sup [minus]][ital X] at 12.6 GeV/nucleon at two acceptances, centered at laboratory observation angles of approximately 0[degree] and 45[degree] with respect to the beam axis. A scintillation counter array downstream of the target was used to sample the charged particle multiplicity of each event and hence give some information on the impact parameter of the collision. Including results from previous experiments, space-time dimensions of the pion source are now available for mass-symmetric collisions in the mass range of [ital A]=40 to 139. The sources are oblate for nearly all systems, except for La+La central collisions viewed near 45[degree] in the laboratory (90[degree] in the center of mass) where the source is spherical. The perpendicular radius [ital R][sub [perpendicular]] is never less than 4 fm, regardless of the centrality of the La+La collision. Furthermore, [ital R][sub [perpendicular]] seems independent of the mass of the collision system.

• DOE Contract Number: FG03-87ER40323; FG05-88ER40437; AC03-76SF00098
• OSTI ID: 6610490
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 47:4; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

663450* -- Heavy-Ion-Induced Reactions & Scattering-- (1992-)
663560 -- Nuclear Mass Ranges-- A=90-149-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BOSE-EINSTEIN STATISTICS
BOSONS
CHARGED-PARTICLE REACTIONS
CORRELATION FUNCTIONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
FUNCTIONS
HADRONS
HEAVY ION REACTIONS
LANTHANUM
LANTHANUM 139 REACTIONS
MESONS
METALS
MULTIPLICITY
NUCLEAR REACTIONS
PARTICLE PRODUCTION
PIONS
PIONS MINUS
PSEUDOSCALAR MESONS
RARE EARTHS
RELATIVISTIC RANGE
TEV RANGE
TEV RANGE 01-10