Fragmentation cross sections of 2.1-GeV/nucleonC12andO16ions

Abstract

A tungsten-scintillator ionization spectrometer (1000 g/${\mathrm{cm}}^2$ total depth) has been exposed to 2.1-GeV/nucleon ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ and ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ ions at the Bevatron. Fragmentations of the incident ions could be observed in a five-layer CsI target (each layer 9 g/${\mathrm{cm}}^2$ thick) and in five tungstenscintillator layers (each 13 g/${\mathrm{cm}}^2$ thick). The number of fragmentations in each of these layers has been used to determine the total fragmentation cross sections. The Bradt-Peters overlap parameters are consistent with zero when calculated using these cross sections and a value of $r_0=1.25\mathrm{}\times {10}^{-13\mathrm{}}$ cm.