Production of pions and light fragments in 0. 8A GeV La+La collisions

Journal Article · Thu Sep 01 04:00:00 EDT 1988 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.38.1229· OSTI ID:6951645

Hayashi, S; Miake, Y; Nagae, T; Nagamiya, S; Hamagaki, H; Hashimoto, O; Shida, Y; Tanihata, I; Kimura, K; Yamakawa, O; others, and

The spectra of pions and light fragments at laboratory angles from 10/sup 0/ to 89/sup 0/ were measured in 0.8A GeV La+La collisions. Event multiplicity was also measured to select central collisions. For inclusive data, the slope of the pion spectrum at theta/sub c.m./ = 90/sup 0/ for La+La is as steep as that for Ar+KCl while the slope of the proton spectrum at theta/sub c.m./ = 90/sup 0/ becomes less steep with increasing mass number of the colliding nuclei. Furthermore, the ..pi../sup -/ yield is about half of the geometrical estimate while total nuclear charge yield agrees well. Since the yield ratio of ..pi../sup -/ to total nuclear charge at theta/sub c.m./ = 90/sup 0/ is significantly larger for high multiplicity events than for inclusive data, it appears that pion absorption by spectator nucleons is important. An azimuthal correlation of charged particle emission was also observed, which is consistent with collective flow of nuclear matter. The coalescence relation between protons and composite fragments holds for inclusive data in La+La collisions.

• Research Organization: Department of Physics, Faculty of Science, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113, Japan
• OSTI ID: 6951645
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 38:3; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651720* -- Nuclear Properties & Reactions
A=90-149
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
BARYONS
BOSONS
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DEUTERONS
DISTRIBUTION
ELEMENTARY PARTICLES
ENERGY RANGE
ENERGY SPECTRA
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FERMIONS
GEV RANGE
GEV RANGE 100-1000
HADRONS
HEAVY ION REACTIONS
HELIUM 3
HELIUM 4
HELIUM ISOTOPES
ISOTOPES
LANTHANUM 139 REACTIONS
LANTHANUM 139 TARGET
LIGHT NUCLEI
MATTER
MESONS
MULTIPLICITY
NUCLEAR MATTER
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
PARTICLE PRODUCTION
PIONS
PIONS MINUS
PROTONS
PSEUDOSCALAR MESONS
SPECTRA
STABLE ISOTOPES
TARGETS
TRITONS