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,pα${)}^8$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., ${\mathrm{\Theta }}_{\mathit{q}}$ and ${\mathit{cphi}}_{\mathit{q}}$ anisotropies). Experiments of this kind are desirable also for electron-induced cluster knockout. Finally, the possibility of observing ${\mathrm{\Theta }}_{\mathit{q}}$ and ${\mathit{cphi}}_{\mathit{q}}$ anisotropies in ${}_{}{}^2{}_{}{}^{}\mathrm{H}$(e,e’p)${\mathit{N}}^{\mathrm{*}}$ and ${}_{}{}^1{}_{}{}^{}\mathrm{H}$(e,e’${\mathrm{\pi }}^{+}$)n reactions at a few GeV energies due to the quark deexcitation effects is discussed.

• Received 17 December 1993

DOI:https://doi.org/10.1103/PhysRevC.50.148