Knockout reactions fromO14at 305 MeV/nucleon

Abstract

The cross section for one-proton knockout from $^{14}\mathrm{O}$ on a carbon target at 305 MeV/nucleon was measured to be ${\ensuremath{\sigma}}_{\ensuremath{-}p}(^{14}\mathrm{O}\ensuremath{\rightarrow}^{13}\mathrm{N})=35(5)\phantom{\rule{0.28em}{0ex}}\mathrm{mb}$. The one-proton one-neutron ($pn$) removal cross section ${\ensuremath{\sigma}}_{\ensuremath{-}p\ensuremath{-}n}(^{14}\mathrm{O}\ensuremath{\rightarrow}^{12}\mathrm{N})=30(6)\phantom{\rule{0.28em}{0ex}}\mathrm{mb}$ and two-proton one-neutron ($2pn$) removal cross section ${\ensuremath{\sigma}}_{\ensuremath{-}2p\ensuremath{-}n}(^{14}\mathrm{O}\ensuremath{\rightarrow}^{11}\mathrm{C})=41(6)\phantom{\rule{0.28em}{0ex}}\mathrm{mb}$ were also obtained. The deduced reduction factor, the ratio of the experimental and theoretical cross sections, is close to unity for one-proton knockout from $^{14}\mathrm{O}$, consistent with the systematics as well as the result obtained at a much lower beam energy. The indirect reaction process, which involves a one-neutron knockout plus proton(s) evaporation mechanism, is expected to contribute much to the $pn$ and $2pn$ removal.