Quasi-Free Scattering

Comparison of quasifree (p,2p) with (p,pn) scattering as a check of the impulse approx

“…(ii) and also for the effective polarization are t, one sees from expression (2) that the cross sections are affected by about 10%. In the ratio of the cross sections the effect is mostly smaller, because the functions P (8) for (p,p) and (p,n) scattering tend to have in our case the same sign and comparable magnitudes.…”

6Li(p, 2p)5He Reaction and Alpha-Deuteron Cluster Model for6Li

“…Angular correlation distributions for the knocking out of the leastbound proton in 6 Li are narrow and indicate the quantitative breakdown 7 ) of the shell modeL Further, the filling up of the dip at zero momentum transfer cannot be attributed to experimental resolutions 7 ) and reaction mechanisms. s) The corresponding summed energy spectrum is continuum.…”

“…In treating the quasi-free P-P collision in 6 Li followed by the n-a breaking-up of sHe, we use 10 l the plane wave impulse approximation for the primary process and the final state interaction theory for the subsequent one. The momenta (energies) of the incident and the two outgoing protons are denoted by k;(E;) (i=O, 1, 2), respectively.…”

Short range interaction of nucleons inside the nucleus viaHe4(e,e’p)Rreactions

“…Such a model gives a quite good description of the one-body properties of nuclei. Experimentalists have studied these properties rather extensively, initially with hadronic probes in pickup, stripping, and knockout reactions where the cross sections are relatively large [1], and more recently with electromagnetic probes for which the reaction dynamics are more straightforward [2]. For instance the momentum distribution in the diferent shells have been measured, giving direct evidence for the validity of the independent particle shell model.…”

“…This has been attempted [10] with (e, e') data on He [11,12]. However there are limitations which compromise the analysis: (1) The experimental error bars are such that there is actually little information; (2) the integral of the Coulomb sum can be measured up to a xnaximum energy transfer only; one must then use some extrapolationfor instance an exponential tailof the integrand to fully evaluate the integral;…”