Elsevier

Physics Letters B

Volume 87, Issue 4, 19 November 1979, Pages 349-353
Physics Letters B

Negative pion production by 800 MeV/A C, Ne, and Ar beams

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Abstract

Energy and angular distributions of π's produced in relativistic heavy-ion collisions have been measured at 800 MeV/A incident energy. Cross sections for low-energy pions (Ecm ≈ 100–200 MeV) are forward and backward peaked in the nucleon-nucleon c.m. frame. Such anisotropy becomes weaker for higher energy pions. The shape of the energy spectra at θcm = 90° is approximately exponential. Their slopes are steeper than those observed for protons. The data are discussed in terms of several models.

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We would like to express our thanks to Dr. L. Anderson and Dr. W. Brückner for their participation in the experiment at an initial stage. Thanks also go to Mr. R. Fuzesy for his technical support and to Prof. K. Nakai for stimulating discussions. This work was supported by the Nuclear Science Division of the U.S. Department of Energy under contract W-7405-ENG-48 and by the Yamada Foundation and the Japan Society for the Promotion of Science.

1

On leave from Department of Physics, Osaka University, Japan.

2

Present address: D.Ph.N.B.E., CEN de Saclay, France.

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