Projectile rapidity pions in 775 MeV/nucleon [sup 139]La+[sup 12]C and [sup 139]La+[sup 139]La reactions

Journal Article · Sat Jan 01 00:00:00 EST 1994 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.49.420· OSTI ID:5285721

Hashimoto, O; Hamagaki, H; Kobayashi, T; Nakayama, K; Shida, Y; Tanihata, I; Yamakawa, O; Yoshikawa, N ^[1]; Nagamiya, S ^[2]; Bistirlich, J A; Crowe, K M; Humanic, T J; Justice, M; Rasmussen, J O; Xu, Y ^[3]

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1. Institute for Nuclear Study, University of Tokyo, Tanashi, Tokyo 188 (Japan)
2. Department of Physics, Columbia University, New York, New York, 10027 (United States)
3. Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720 (United States)

Negative pion spectra emitted in the reactions of 775 MeV/nucleon [sup 139]La+[sup 12]C and [sup 139]La+[sup 139]La reactions have been measured in coincidence with the projectile fragments using the HISS spectrometer at the Bevalac. Prominent peaks near the beam velocity were observed in the pion spectra. Position and widths of the peaks were studied as a function of the sum charge'' of projectile fragments which is a good measure of impact parameter; the smaller the sum charge,'' the smaller the impact parameter. The peak position down shifts with the smaller sum charge.'' The pion peak is wider in the transverse than in the longitudinal direction, possibly mirroring the velocity dispersions of projectile fragments in the early stage of reactions.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5285721
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Vol. 49:1; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CARBON 12 TARGET
PIONS MINUS
LANTHANUM 139 TARGET
COINCIDENCE METHODS
DEEP INELASTIC HEAVY ION REACTIONS
GEV RANGE 100-1000
LANTHANUM 139 REACTIONS
PARTICLE RAPIDITY
BOSONS
CHARGED-PARTICLE REACTIONS
COUNTING TECHNIQUES
ELEMENTARY PARTICLES
ENERGY RANGE
GEV RANGE
HADRONS
HEAVY ION REACTIONS
MESONS
NUCLEAR REACTIONS
PARTICLE PROPERTIES
PIONS
PSEUDOSCALAR MESONS
TARGETS
663450* - Heavy-Ion-Induced Reactions & Scattering- (1992-)
663570 - Nuclear Mass Ranges- A=150-189- (1992-)