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

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. Th...

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Veröffentlicht in:	Phys. Rev. Lett.; (United States) 1982-01, Vol.48, p.732-735
Hauptverfasser:	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.
Format:	Artikel
Sprache:	eng
Schlagworte:	651325 - Nuclear Properties & Reactions, A=6-19, Experimental- Nuclear Reactions & Scattering- (-1987) 651925 - Nuclear Properties & Reactions, A=190-219, Experimental- Nuclear Reactions & Scattering- (-1987) 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 Experiment NUCLEAR PHYSICS AND RADIATION PHYSICS NUCLEAR REACTIONS NUCLEON-NUCLEON INTERACTIONS PARTICLE INTERACTIONS PARTICLE PRODUCTION Physics PIONS PIONS PLUS PSEUDOSCALAR MESONS SCATTERING TRANSITION ELEMENTS
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Zusammenfassung:	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.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.48.732