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The preequilibrium (nucleon-in, nucleon-out) angular distributions of$^{27}$Al, $^{58}$Ni and $^{90}$Zr have been analyzed in the energy region from90 to 200 MeV in terms of the Quantum Moleculear Dynamics (QMD) theory. First,we show that the present approach can reproduce the measured (p,xp') and (p,xn)angular distributions leading to continuous final states without adjusing anyparameters. Second, we show the results of the detailed study of thepreequilibrium reaction processes; the step-wise contribution to the angulardistribution, comparison with the quantum-mechanical Feshbach-Kerman-Koonintheory, the effects of momentum distribution and surface refraction/reflectionto the quasifree scattering. Finally, the present method was used to assess theimportance of multiple preequilibrium particle emission as a function ofprojectile energy up to 1 GeV.Comment: 22pages, Revex is used, 10 Postscript figures are available by  request from chiba@hadron04.tokai.jaeri.go.j

Nucleon-induced preequilibrium reactions in terms of the quantum molecular dynamics