508 research outputs found
Semi-inclusive deep inelastic lepton scattering off complex nuclei
It is shown that in semi-inclusive deep inelastic scattering (DIS) of
electrons off a complex nucleus A, the detection, in coincidence with the
scattered electron, of a nucleus (A-1) in the ground state, as well as of a
nucleon and a nucleus (A-2), also in the ground state, may provide unique
information on several long standing problems, such as : i) the nature and the
relevance of the final state interaction in DIS; ii) validity of the spectator
mechanism in DIS; iii) the medium induced modifications of the nucleon
structure function; iv) the origin of the EMC effect.Comment: Latex, 41 pages, 12 ps figures included in submission. To appear in
European Physics Journal A,
y-scaling in Quasielastic Electron Scattering from Nuclei
A relativistic single particle model is used to calculate the inclusive
reaction from 12, 40, 56, 197, and 208 nuclei in the quasielastic
region. We have shown that this model provides a very good description of the
available experimental cross sections when they are dominated by the
quasielastic process. In this paper we use this model to investigate the
dependence of -scaling on electron kinematics, particularly the electron
scattering angle, for a range of squared four momentum transfer
(GeV/c). In this kinematic domain, Coulomb distortion of the electron does
not significantly affect scaling, but final state interactions of the knocked
out nucleon do affect scaling particularly when the nucleons have lower
energies. In general, we find that scaling works for this reaction, but at
lower values of the four momentum transfer, the scaling function does have some
dependence on the electron scattering angle. We also consider a modification of
y-scaling to include small binding energy effects as a function of Z and A and
show that there is some improvement in scaling.Comment: 21 pages, 11 figure
Rescattering and finite formation time effects in electro-disintegration of the deuteron in the cumulative region
The role of rescattering due to the final state interaction (FSI) and the
influence of the finite formation time (FFT) on the inclusive and
exclusive electro-disintegration of the deuteron are studied in the
cumulative kinematical region and moderate values of the 4-momentum
transfer (GeV/c). The spins are averaged out. It is found
that in the inclusive process the relative magnitude of rescattering steadily
grows with and that at it has the same order as the plane wave
impulse approximation (PWIA) contribution, with the finite formation time
effects decreasing the rescattering contribution by %. In the
exclusive process, with increasing momentum transfer, FFT substantially reduces
the effects from FSI, although the latter are still appreciable in the region
of momentum transfer investigated.Comment: 5 pages, 5 EPS figures. Presented by M. A. Braun at the Fourth
International Conference on Hadronic Physics, Trieste (Italy), ICTP May
12-16, 2003. To appear in EPJ
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