Measurement of the helicity-dependent response in quasi-elastic proton knockout from $^{40}{\rm Ca}$
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2025
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| author | Kolar, Tim Sabo-Napadensky, Iris Achenbach, Patrick Christmann, Mirko Distler, Michael Otto Doria, Luca Eckert, Phillipp Esser, Anselm Giusti, Carlotta Geimer, Jennifer Gülker, Pepe Hoek, Matthias Klag, Pascal Lichtenstadt, Jechiel Littich, Maximilian Manoussos, Theodoros Markus, David Merkel, Harald Mihovilovič, Miha Müller, Julian Müller, Ulrich Pätschke, Jonas Paul, Sebouh J. Piasetzky, Eliezer Plura, Saskia Pochodzalla, Joseph Požun, Matej Ron, Guy Schlimme, Björn Sören Sfienti, Concettina Stengel, Sebastian Stephan, Ela Strauch, Steffen Szyszka, Constantin Širca, Simon Thiel, Michaela Wilczek, Andrzej |
| author_facet | Kolar, Tim Sabo-Napadensky, Iris Achenbach, Patrick Christmann, Mirko Distler, Michael Otto Doria, Luca Eckert, Phillipp Esser, Anselm Giusti, Carlotta Geimer, Jennifer Gülker, Pepe Hoek, Matthias Klag, Pascal Lichtenstadt, Jechiel Littich, Maximilian Manoussos, Theodoros Markus, David Merkel, Harald Mihovilovič, Miha Müller, Julian Müller, Ulrich Pätschke, Jonas Paul, Sebouh J. Piasetzky, Eliezer Plura, Saskia Pochodzalla, Joseph Požun, Matej Ron, Guy Schlimme, Björn Sören Sfienti, Concettina Stengel, Sebastian Stephan, Ela Strauch, Steffen Szyszka, Constantin Širca, Simon Thiel, Michaela Wilczek, Andrzej |
| contents | The role of the electron-helicity-dependent cross-section term and the structure function $f^{\prime}_{01}$ in the quasi-elastic $A(\vec{e}, e^{\prime}p)$ process was studied. The $f^{\prime}_{01}$ was measured for proton knockout from the $1\mathrm{d}_{3/2}$ shell in $^{40}\mathrm{Ca}$ via the $^{40}{\rm Ca}(\vec{e},e' p)^{39}{\rm K}_{\rm g.s.}$ 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 $f^{\prime}_{01}$ 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 $\vec{L}\cdot \vec{S}$ term in a nuclear optical potential is discussed. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_09972 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Measurement of the helicity-dependent response in quasi-elastic proton knockout from $^{40}{\rm Ca}$ Kolar, Tim Sabo-Napadensky, Iris Achenbach, Patrick Christmann, Mirko Distler, Michael Otto Doria, Luca Eckert, Phillipp Esser, Anselm Giusti, Carlotta Geimer, Jennifer Gülker, Pepe Hoek, Matthias Klag, Pascal Lichtenstadt, Jechiel Littich, Maximilian Manoussos, Theodoros Markus, David Merkel, Harald Mihovilovič, Miha Müller, Julian Müller, Ulrich Pätschke, Jonas Paul, Sebouh J. Piasetzky, Eliezer Plura, Saskia Pochodzalla, Joseph Požun, Matej Ron, Guy Schlimme, Björn Sören Sfienti, Concettina Stengel, Sebastian Stephan, Ela Strauch, Steffen Szyszka, Constantin Širca, Simon Thiel, Michaela Wilczek, Andrzej Nuclear Experiment The role of the electron-helicity-dependent cross-section term and the structure function $f^{\prime}_{01}$ in the quasi-elastic $A(\vec{e}, e^{\prime}p)$ process was studied. The $f^{\prime}_{01}$ was measured for proton knockout from the $1\mathrm{d}_{3/2}$ shell in $^{40}\mathrm{Ca}$ via the $^{40}{\rm Ca}(\vec{e},e' p)^{39}{\rm K}_{\rm g.s.}$ 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 $f^{\prime}_{01}$ 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 $\vec{L}\cdot \vec{S}$ term in a nuclear optical potential is discussed. |
| title | Measurement of the helicity-dependent response in quasi-elastic proton knockout from $^{40}{\rm Ca}$ |
| topic | Nuclear Experiment |
| url | https://arxiv.org/abs/2504.09972 |