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Results of a kinematically complete experiment on backward π[sup –]d quasielastic scattering by [sup 6]Li are presented. The experiment was carried out at the ITEP 3-m magnetic spectrometer with pion beams of momenta 0.72, 0.88, and 1.28GeV/c. The Fermi-motion parameters of a quasideuteron cluster and the effective number of quasideuterons in [sup 6]Li are determined for the [sup 6]Li(π[sup –],π[sup –]d)[sup 4]He reaction. These values agree well with the proton- and electron-beam measurements. The possibility of observation of the effects of deuteron wave-function modification in nuclear matter is discussed for this reaction. © 2001 MAIK “Nauka / Interperiodica”. [ABSTRACT FROM AUTHOR]

The plane-wave approximation was used to examine the proton Fermi-momentum distribution in experiments on quasielastic large-momentum-transfer pion–nucleon scattering in light nuclei [sup 6]Li,[sup 7]Li, and [sup 12]C. It was found that, unlike the (e,e′) reaction, the Fermi-gas model is in poor agreement with experiment, whereas the oscillator model adequately describes the spectrum shape. However, the parameters obtained for these distributions are sizably smaller than those derived from the (e,e′) experiments. This suggests that the plane-wave approach is inadequate and that more complicated theoretical approaches, supposedly allowing for pion–nucleon amplitude modification in nuclear matter, are necessary for the analysis of experimental data. © 2000 MAIK “Nauka / Interperiodica”. [ABSTRACT FROM AUTHOR]