3He spin-dependent cross sections and sum rules

We present a measurement of the spin-dependent cross sections for the 3He over -->(e over -->,e')X reaction in the quasielastic and resonance regions at a four-momentum transfer 0.1< or =Q2< or =0.9 GeV2. The spin-structure functions have been extracted and used to evaluate the nuclear Burkhardt-Cottingham and extended Gerasimov-Drell-Hearn sum rules for the first time. The data are also compared to an impulse approximation calculation and an exact three-body Faddeev calculation in the quasielastic region.

Proton-neutron and proton-proton correlations in medium-weight nuclei and the role of the tensor force

A detailed analysis of the effect of short-range and tensor correlations on one- and two-nucleon momentum distributions of medium-weight nuclei (12<or=A<or=40) is carried out. Although our Letter is primarily aimed at understanding the role of the tensor force on nucleon momentum distributions of medium-weight nuclei, the possible relevance of our results for the interpretation of (e, e'N) and (e, e'2N) processes at high Q2, aimed at investigating nucleon-nucleon correlations, is discussed.

Nonfactorized calculation of the process 3He(e,e'p)(2H) at medium energies

The exclusive process 3He(e,e'p)(2H) has been analyzed by a nonfactorized and parameter-free approach based upon realistic few-body wave functions corresponding to the AV18 interaction and treating the rescattering of the struck nucleon within a generalized eikonal approximation. The results of our calculations, compared with recent JLab experimental data, show that the left-right asymmetry exhibits a clear dependence upon the final state interaction demonstrating the breaking down of the factorization approximation at "negative" and large ( greater, similar300 MeV/c) values of the missing momentum.