Subthreshold pion production in heavy-ion collisions at 85A MeV

Journal Article · Mon Mar 15 04:00:00 EST 1982 · Phys. Rev. Lett.; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.48.732· OSTI ID:5493769

Johansson, T; Gustafsson, H; Jakobsson, B; Kristiansson, P; Noren, B; Oskarsson, A; Carlen, L; Otterlund, I; Ryde, H; Julien, J; Guet, C; Bertholet, R; Maurel, M; Nifenecker, H; Perrin, P; Schussler, F; Tibell, G; Buenerd, M; Loiseaux, J M; Martin, P ; Bondorf, J P; Nielsen, O; Karvinen, A O.T.; Mougey, J

The ..pi../sup +/ production in 85A-MeV C+C and C+Au reactions has been studied for 20 MeV< or =E/sub ..pi../< or =80 MeV and theta/sub lab/>55/sup 0/. The cross sections, d/sup 2/sigma/d..cap omega.. dE, fall exponentially with E/sub ..pi../ and are 9 times larger for C+Au than for C+C. The angular distribution is backward peaked for C+Au in the nucleon-nucleon c.m. system, while it is weakly forward peaked in the nucleus-nucleus c.m. system. An independent nucleon-nucleon scattering model can explain the data only if diffuse internal momentum distributions are introduced.

• Research Organization: Centre Europeen de Recherches Nucleaires, CH-1211 Geneva 23, Switzerland
• OSTI ID: 5493769
• Journal Information: Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 48:11; ISSN PRLTA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
BARYON-BARYON INTERACTIONS
BOSONS
CARBON
CARBON 12 REACTIONS
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DISTRIBUTION
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
GOLD
HADRON-HADRON INTERACTIONS
HADRONS
HEAVY ION REACTIONS
INTERACTIONS
MESONS
METALS
MEV RANGE
MEV RANGE 100-1000
NONMETALS
NUCLEAR REACTIONS
NUCLEON-NUCLEON INTERACTIONS
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PIONS
PIONS PLUS
PSEUDOSCALAR MESONS
SCATTERING
TRANSITION ELEMENTS