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

K. Nakai, J. Chiba, I. Tanihata, M. Sasao, H. Bowman, S. Nagamiya, and J. O. Rasmussen
Phys. Rev. C 20, 2210 – Published 1 December 1979
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Abstract

Doubly differential cross sections for production of pions with 400-MeV/N Ne20 on C, NaF, Cu, and Pb have been measured for a range of 20 MeV<TπLAB<100 MeV and 30°<θπLAB<150°. The results are compared with previous data with 800-MeV/N Ne20. The broad maximum at θπc.m.=90° 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 Ep=730 MeV. The 90° maximum seems to be a phenomenon specific to nucleus-nucleus collisions around 1 GeV/N, where the multiplicity of Δ formation is high and multiple Δ interaction could influence the pion production. The distribution at higher bombarding energies has yet to be studied.

NUCLEAR REACTIONS C, NaF, Cu, Pb(Ne20,π+)X, EA=400 MeV/nucleon; measured σ(Eπ,θπ), Eπ=20100 MeV, θπ=30°150°.

  • Received 21 June 1979

DOI:https://doi.org/10.1103/PhysRevC.20.2210

©1979 American Physical Society

Authors & Affiliations

K. Nakai and J. Chiba

  • Department of Physics, University of Tokyo, Tokyo, Japan and Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720

I. Tanihata and M. Sasao

  • Laboratory for Nuclear Studies, Osaka University, Toyonaka, Japan and Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720

H. Bowman, S. Nagamiya, and J. O. Rasmussen

  • Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720

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Issue

Vol. 20, Iss. 6 — December 1979

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