Spatial information on the pion-emitting source from pion interferometry

Journal Article · Fri Nov 01 04:00:00 EST 1991 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.44.1957· OSTI ID:5098845

Jiang, Y Z; Huo, L; Liu, Y M; Wang, S ^[1]; Keane, D ^[2]; Chu, S Y; Fung, S Y ^[3]

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1. Department of Physics, Harbin Institute of Technology, Harbin 150006 (People's Republic of China)
2. Department of Physics, Kent State University, Kent, Ohio (USA)
3. Department of Physics, University of California, Riverside, California (USA)

We discuss the physical meaning of the spatial source parameters obtained from two-pion interferometry. We propose that the average radius {l angle}{ital r}{r angle} of the source is a suitable quantity to describe the spatial extent of the source under various assumptions about the source density distribution, and demonstrate that the average radius is more appropriate than the root-mean-square radius proposed by Bartke and Kowalski. The mean square radius {l angle}{ital r}{sup 2}{r angle} of the source can be estimated using a correlation function for small relative momenta, and more detailed information about the source density distribution can be inferred from the value of {ital k}={l angle}{ital r}{sup 2}{r angle}/{l angle}{ital r}{r angle}{sup 2}. Studies of central collisions of 1.5{ital A} GeV Ar+KCl and 1.8{ital A} GeV Ar+Pb at the Bevalac streamer chamber show that the data are consistent with a phenomenological Gaussian model for the density distribution at the present level of experimental accuracy.

• OSTI ID: 5098845
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 44:5; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

653003* -- Nuclear Theory-- Nuclear Reactions & Scattering
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACCELERATORS
ALKALI METAL COMPOUNDS
ARGON 40 REACTIONS
BEVALAC
BOSE-EINSTEIN STATISTICS
BOSONS
CHARGED-PARTICLE REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CORRELATION FUNCTIONS
CYCLIC ACCELERATORS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
FUNCTIONS
GEV RANGE
GEV RANGE 10-100
HADRONS
HALIDES
HALOGEN COMPOUNDS
HEAVY ION REACTIONS
LEAD
MESONS
METALS
MONTE CARLO METHOD
NUCLEAR PROPERTIES
NUCLEAR RADII
NUCLEAR REACTIONS
PARTICLE SOURCES
PIONS
POTASSIUM CHLORIDES
POTASSIUM COMPOUNDS
PSEUDOSCALAR MESONS
RADIATION SOURCES