## Abstract

Polarization transfer to a bound proton in polarized electron knock-out reactions, A(e→,e^{′}p→), is a powerful tool to look for an in-medium modification of the bound proton. It requires comparison to calculations that consider the many-body effects accompanying the quasi-free process. We report here measured components P_{x}^{′}, P_{z}^{′}, and their ratio P_{x}^{′}/P_{z}^{′}, of polarization transfer to protons bound in Ca40, which is described well by the shell model and for which reliable calculations are available. While the calculations capture the essence of the data, our statistical precision allows us to observe deviations that cannot be explained by simple scaling, including by varying the proton electromagnetic form factor ratio G_{E}/G_{M}. We further explore the deviations of the ratio of the polarization transfer components from that of a free proton, (P_{x}^{′}/P_{z}^{′})_{A}/(P_{x}^{′}/P_{z}^{′})_{H}, and its dependence on the bound-proton virtuality.

Original language | English |
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Article number | 138309 |

Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |

Volume | 847 |

DOIs | |

State | Published - 10 Dec 2023 |

### Funding

Funders | Funder number |
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Israel Academy of Arts and Sciences | |

Slovenian Research Agency.We | |

State of Rhineland-Palatinate Ministry of Education Science Further Education and Culture | |

National Science Foundation | PHY-2111050, 2020742 |

National Science Foundation | |

Deutsche Forschungsgemeinschaft | |

Ministry of Science, Technology and Space | 294/18 |

Ministry of Science, Technology and Space | |

United States-Israel Binational Science Foundation | |

Israel Science Foundation | 951/19 |

Israel Science Foundation | |

Javna Agencija za Raziskovalno Dejavnost RS | P1–0102 |

Javna Agencija za Raziskovalno Dejavnost RS | |

Ministry of Science and Technology, Israel | |

PAZY Foundation | |

Uniwersytet Śląski w Katowicach |

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