Production of Negative Pions with 183-MeV/Nucleon Ne Beams

S. Nagamiya; H. Hamagaki; P. Hecking; S. Kadota; R. Lombard; Y. Miake; E. Moeller; S. Schnetzer; H. Steiner; I. Tanihata; S. Bohrmann; J. Knoll

doi:10.1103/PhysRevLett.48.1780

Production of Negative Pions with 183-MeV/Nucleon Ne Beams

S. Nagamiya, H. Hamagaki, P. Hecking, S. Kadota, R. Lombard, Y. Miake, E. Moeller, S. Schnetzer, H. Steiner, I. Tanihata, S. Bohrmann, and J. Knoll

Phys. Rev. Lett. 48, 1780 – Published 28 June 1982

Abstract

Cross sections for negative pion production in 183-MeV/nucleon Ne + NaF and Ne + Pb collisions have been measured at laboratory angles from 20° to 90°. Almost isotropic angular distributions in the nucleon-nucleon c.m. frame are observed. The energy spectra in this frame are of an exponential type with an inverse slope of 25 MeV for NaF and 26 MeV for Pb. No evidence of a bump predicted to result from pionic instability is observed. Possible mechanisms for producing high-energy pions are discussed.

Received 25 February 1982

DOI:https://doi.org/10.1103/PhysRevLett.48.1780

Authors & Affiliations

S. Nagamiya^*, H. Hamagaki^†, P. Hecking, S. Kadota^†, R. Lombard^‡, Y. Miake^§, E. Moeller^∥, S. Schnetzer^¶, H. Steiner^**, and I. Tanihata^†

Nuclear Science Division, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720

S. Bohrmann

Max Planck Institut für Kernforschung, D-6900 Heidelberg, Germany

J. Knoll

Gesellschaft für Schwerionenforschung, D-6100 Darmstadt, Germany

^*Also at Department of Physics, Faculty of Science, University of Tokyo, Hongo, Bunkyo-ku, Tokyo, Japan.
^†On leave from Institute for Nuclear Study, University of Tokyo, Tanashi-shi, Tokyo, Japan.
^‡Present address: Département de Physique Nucléaire/Moyenne Energie, Centre d'Etudes Nucléaires de Saclay, F-91191 Gif-sur-Yvette, France.
^§On leave from Department of Physics, Osaka University, Osaka, Japan.
^∥On leave from Institut für Theoretische Physik, Freie Universität Berlin, D-1000 Berlin 33, Germany.
^¶Present address: National Laboratory for High-Energy Physics (KEK), Oho-machi, Tsukuba-gun, Ibaraki-ken, Japan.
^**Also at Department of Physics, University of California, Berkeley, California 94720.