Abstract
A new kind of cluster quasieleastic knockout experiment is proposed based on the generalized distorted wave impulse approximation calculation which uses Glauber-Sitenko multiple scattering theory and takes into account deexcitation of virtual excited clusters in the nucleus. Elements of general formalism are presented, including the discussion of the difference between ``fast'' and ``slow'' cluster processes. The reaction $^{12}\mathrm{C}$(p,p\ensuremath{\alpha}${)}^{8}$Be is considered in detail. It shows a strong dependence of the ``effective momentum distribution'' of knocked-out cluster on both the scattering angle of fast proton and orientation angles of recoil momentum q with respect to the direction of the incident beam and to the scattering plane of a fast proton (i.e., ${\mathrm{\ensuremath{\Theta}}}_{\mathit{q}}$ and ${\mathit{cphi}}_{\mathit{q}}$ anisotropies). Experiments of this kind are desirable also for electron-induced cluster knockout. Finally, the possibility of observing ${\mathrm{\ensuremath{\Theta}}}_{\mathit{q}}$ and ${\mathit{cphi}}_{\mathit{q}}$ anisotropies in $^{2}\mathrm{H}$(e,e'p)${\mathit{N}}^{\mathrm{*}}$ and $^{1}\mathrm{H}$(e,e'${\mathrm{\ensuremath{\pi}}}^{+}$)n reactions at a few GeV energies due to the quark deexcitation effects is discussed.