200-MeV- pi +-induced single-nucleon removal from 24Mg.

Abstract

Nuclear \ensuremath{\gamma} rays in coincidence with outgoing pions or protons following single-nucleon removal from $^{24}\mathrm{Mg}$ by 200-MeV ${\ensuremath{\pi}}^{+}$ have been detected with Ge(Li) detectors. Differential cross sections are reported for \ensuremath{\gamma} rays from the first excited mirror states of $^{23}\mathrm{Na}$ and $^{23}\mathrm{Mg}$ in coincidence with positive pions or protons detected in particle telescopes at 30\ifmmode^\circ\else\textdegree\fi{}, 60\ifmmode^\circ\else\textdegree\fi{}, 90\ifmmode^\circ\else\textdegree\fi{}, 120\ifmmode^\circ\else\textdegree\fi{}, and 150\ifmmode^\circ\else\textdegree\fi{}; angle-integrated absolute cross sections and cross section ratios \ensuremath{\sigma}${(\mathrm{}}^{23}$Mg)/\ensuremath{\sigma}${(\mathrm{}}^{23}$Na) are calculated. These results are compared with the predictions of a Pauli-blocked plane-wave impulse approximation and the intranuclear cascade and nucleon charge exchange reaction models. The plane-wave impulse approximation and the intranuclear cascade calculations generally agree with the angular dependence of the experimental results but not the absolute magnitude. The nucleon charge exchange calculation does not reproduce the observed cross section charge ratios.