Download or read book Mid-rapidity Pion Cross Sections written by and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Pion production by collisions of relativistic heavy ions has been studied recently by Wolf et al. For the reaction 1.05 GeV/A 4°Ar + Ca .-->. .pi./sup +/, they discovered a peak in the invariant cross section at mid-rapidity at P/sub perpendicular/ approx. 0.5 m/sub .pi./c. This peak is not apparent in the 730 MeV p/sup +/p data of Cochran et al. and was attributed to possible hydrodynamic flow effects. Several authors have suggested that the .pi./sup +/ peak is a Coulomb effect. These models predict the .pi.− would be drawn in towards the fireball, leaving an essentially flat distribution in the mid-rapidity region. Mid-rapidity .pi./sup +/ and .pi.− cross sections were measured using a 1.05 GeV/A argon beam with a calcium target. The pions were measured with a magnetic spectrometer set at 15° to the beam and were stopped in a scintillator range telescope. Results are presented and discussed. (WHK).