Pions produced near the center-of-mass velocity in heavy-ion collisions

K. A. Frankel; J. A. Bistirlich; R. Bossingham; H. R. Bowman; K. M. Crowe; C. J. Martoff; D. Murphy; J. O. Rasmussen; J. P. Sullivan; W. A. Zajc; J. P. Miller; O. Hashimoto; M. Koike; J. Peter; W. Benenson; G. M. Crawley; E. Kashy; J. A. Nolen, Jr; J. Quebert

doi:10.1103/PhysRevC.25.1102

Rapid Communication

Pions produced near the center-of-mass velocity in heavy-ion collisions

K. A. Frankel, J. A. Bistirlich, R. Bossingham, H. R. Bowman, K. M. Crowe, C. J. Martoff, D. Murphy, J. O. Rasmussen, J. P. Sullivan, W. A. Zajc, J. P. Miller, O. Hashimoto, M. Koike, J. Peter, W. Benenson, G. M. Crawley, E. Kashy, J. A. Nolen, Jr., and J. Quebert

Phys. Rev. C 25, 1102(R) – Published 1 February 1982

Abstract

The cross section for producing $π^{+}$ and $π^{-}$ at velocities close to that of the center of mass was studied for the ${}^{40}{Ar}$ + ${}^{40}{Ca}$ reaction at $\frac{E}{A} = 1.05$ GeV. The $π^{+}$ and $π^{-}$ data show a flat plateau around $y_{c . m .} = 0$ . The $\frac{π^{-}}{π^{+}}$ ratio of 1.5 ±0.2 is much lower than published theoretical predictions. Data were also obtained for carbon and uranium targets.

NUCLEAR REACTIONS C( ${}^{40}{Ar}$ , $π^{\pm}$ )Ca( ${}^{40}{Ar}$ , $π^{\pm}$ ), U( ${}^{40}{Ar}$ , $π^{\pm}$ ); $\frac{E}{A} = 1050$ MeV; measured $σ (E, θ)$ .