Portal de Periódicos da CAPES

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

1982; American Institute of Physics; Volume: 25; Issue: 2 Linguagem: Inglês

10.1103/physrevc.25.1102

1538-4497

K.A. Frankel, J. Bistirlich, V. Singh, H. Bowman, K.M. Crowe, C. J. Martoff, D. L. Murphy, John Rasmussen, J. P. Sullivan, W. A. Zajc, J. Miller, Osamu Hashimoto, M. Koike, J. Péter, W. Benenson, G. M. Crawley, E. Kashy, J. A. Nolen, J. Québert,

Quantum Chromodynamics and Particle Interactions

The cross section for producing ${\ensuremath{\pi}}^{+}$ and ${\ensuremath{\pi}}^{\ensuremath{-}}$ at velocities close to that of the center of mass was studied for the $^{40}\mathrm{Ar}$+$^{40}\mathrm{Ca}$ reaction at $\frac{E}{A}=1.05$ GeV. The ${\ensuremath{\pi}}^{+}$ and ${\ensuremath{\pi}}^{\ensuremath{-}}$ data show a flat plateau around ${y}_{\mathrm{c}.\mathrm{m}.}=0$. The $\frac{{\ensuremath{\pi}}^{\ensuremath{-}}}{{\ensuremath{\pi}}^{+}}$ ratio of 1.5 \ifmmode\pm\else\textpm\fi{}0.2 is much lower than published theoretical predictions. Data were also obtained for carbon and uranium targets.NUCLEAR REACTIONS C($^{40}\mathrm{Ar}$, ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$)Ca($^{40}\mathrm{Ar}$,${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$), U($^{40}\mathrm{Ar}$,${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$); $\frac{E}{A}=1050$ MeV; measured $\ensuremath{\sigma}(E,\ensuremath{\theta})$.