Measurement of the helicity-dependent response in quasi-elastic proton knockout from40Ca

Le résumé fourni par la source

The role of the electron-helicity-dependent cross-section term and the structure function f01′ in the quasi-elastic A(e→,e′p) process was studied. The f01′ was measured for proton knockout from the 1d3/2 shell in 40Ca via the 40Ca(e→,e′p)39Kg.s. reaction, leaving the residual nucleus in a well-defined state. It requires a longitudinally polarized electron beam and out-of-plane proton detection. This structure function vanishes in the absence of final-state interactions (FSI) involving the ejected proton. Presented are the dependencies of f01′ on the missing momentum (closely related to the initial proton’s Fermi momentum) and the angle between the knocked-out proton and the virtual photon momenta. The role of the spin-orbit interaction in FSI through the L→·S→ term in a nuclear optical potential is discussed.

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