Probing the direct step of relativistic heavy ion fragmentation:(12C,11B + p) at 2.1 GeV/nucleon with C a

Quasifree (p,2p) and (p,pn)

“…The cross sections, for all three cases are comparable. The shapes of the momentum distributions in cases can be reproduced with a nucleon-nucleon cascade model including pion production, but the theoretical predictions for the quasi-elastic component is too large by a factor of 3 [94]. The low momentum transfer peak is consistent with two mechanisms, (1) an excitation and decay via proton emission of the carbon projectile and (2) a projectile proton scattering diffractively off the C target.…”

“…As shown from direct experimental analysis (see, e.g., Ref. [91]), the (p, pN) cross section gets contributions from (a) nucleon-nucleon quasielastic scattering, (b) nucleon-nucleon inelastic scattering, and (c) a low excitation energy. The cross sections, for all three cases are comparable.…”

“…However, such data have been measured so far only with very restricted angular acceptances. The analysis of Webb et al [91] shows that only around 50% of the inclusive cross section at 1 GeV/nucleon corresponds to quasielastic scattering. The cross section measured by those authors is 8.8(2.5) mb compared to our prediction of about 20 mb using elastic dσ pp /d at 1 GeV.…”

“…The experimental cross section in Ref. [91] has been acceptance corrected using the cascade model, meaning that it is model dependent. The fully exclusive experiments in inverse kinematics as planned at the radioactive-beam facilities [8][9][10][11] will provide a full solid-angle coverage, and will thus be directly comparable to our predictions.…”

Alpha-cluster description of excitation energies inC12(12Cucinotta1, Dubey2 1994Phys. Rev. C160130View full textAdd to dashboardCite

“…The abrasion response functions will also describe the excitation spectrum following nucleon abrasion through multiple quasielastic nucleon-nucleon scatterings and will be used [15] to describe the measurements of Webb et al [24] using the HISS detector for the excitation energy in the ( C, B+p) fragmentation channel where an important 6 production component is expected [24,15].…”