Low-energy pion production in high-energy nucleus-nucleus collisions

Journal Article · Sat Dec 01 04:00:00 EST 1979 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.20.2210· OSTI ID:5727362

Nakai, K; Chiba, J; Tanihata, I; Sasao, M; Bowman, H; Nagamiya, S; Rasmussen, J O

Doubly differential cross sections for production of pions with 400-MeV/N /sup 20/Ne on C, NaF, Cu, and Pb have been measured for a range of 20 MeV < T/sub ..pi..//sup LAB/ < 100 MeV and 30/sup 0/ < theta/sub ..pi..//sup LAB/ < 150/sup 0/. The results are compared with previous data with 800-MeV/N /sup 20/Ne. The broad maximum at theta/sub ..pi..//sup c.m./ = 90/sup 0/ in the center-of-mass angular distribution of low-energy pions observed at 800 MeV/N is not seen at the present energy. Neither was such a maximum at the central-rapidity region observed in (p + nucleus) reactions at E/sub p/ = 730 MeV. The 90/sup 0/ maximum seems to be a phenomenon specific to nucleus-nucleus collisions around 1 GeV/N, where the multiplicity of ..delta.. formation is high and multiple ..delta.. interaction could influence the pion production. The distribution at higher bombarding energies has yet to be studied.

• Research Organization: Department of Physics, University of Tokyo, Tokyo, Japan
• OSTI ID: 5727362
• Journal Information: Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 20:6; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALI METAL COMPOUNDS
ANGULAR DISTRIBUTION
BOSONS
CARBON
CHARGED-PARTICLE REACTIONS
COPPER
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
DISTRIBUTION
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
FLUORIDES
FLUORINE COMPOUNDS
GEV RANGE
GEV RANGE 01-10
HADRONS
HALIDES
HALOGEN COMPOUNDS
HEAVY ION REACTIONS
INTERACTIONS
LEAD
MEASURING INSTRUMENTS
MESONS
METALS
MULTIPLICITY
NEON 20 REACTIONS
NONMETALS
NUCLEAR REACTIONS
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PIONS
PIONS PLUS
PLASTIC SCINTILLATION DETECTORS
PSEUDOSCALAR MESONS
RADIATION DETECTORS
SCINTILLATION COUNTERS
SODIUM COMPOUNDS
SODIUM FLUORIDES
SOLID SCINTILLATION DETECTORS
TRANSITION ELEMENTS