Measurement of the helicity-dependent response in quasi-elastic proton knockout from ⁴⁰\rm Ca

2025/04/14 by T. Kolar, I. Sabo-Napadensky, Kolar, Tim +69
Engineering · Medicine · #Radiation Effects in Electronics #Radiation Therapy and Dosimetry #Real-time simulation and control systems

paper · pdf · doi:10.48550/arxiv.2504.09972

Abstract

The role of the electron-helicity-dependent cross-section term and the structure function f^′₀₁ in the quasi-elastic A(e, e^′p) process was studied. The f^′₀₁ was measured for proton knockout from the 1d_3/2 shell in ⁴⁰Ca via the ⁴⁰\rm Ca(e,e' p)³⁹\rm K_{\rm g.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 f^′₀₁ 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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