Measurement of recoil proton polarization in the $\mathrm{^{12}C(\vec e, e' \vec p)}$ process at large virtualitiesKolar, Tim (Avtor) Širca, Simon (Mentor) polarized electron beamelectron-proton scatteringlepton-induced reactionsnuclear shell modelpolarimetrymagnetic charged-particle spectrometersElectron scattering experiments of the A$(\vec{e},e'\vec{p})$ type involving degrees of freedom related to the polarization of the particles are a rich source of information about the proton structure, both when embedded inside nucleus or when it is free (A=$^1$H). This was established by numerous experiments which were conducted on $^1$H, $^2$H, $^4$He, $^{12}$C, and $^{16}$O targets. These measurements presented the results, typically, as a function of momentum transfer squared or missing momentum. Only recently a new variable, called virtuality, has become a more popular choice. This is mainly due to the fact that the polarization transfer component ratio normalized with the same ratio for hydrogen, $\mathrm{(P'_x/P'_z)_A/(P'_x/P'_z)_{^1H}}$, which can be related to the change of electromagnetic form-factor ratio, $\mathrm{G^p_E/G^p_M}$, of the bound proton, exhibits universal behavior once it is considered as a function of virtuality, regardless of which target nucleus is used. This work presents the first measurement of the polarization transfer components in the A$(\vec{e},e'\vec{p})$ process in quasi-elastic kinematics for protons of similar virtualities that were knocked out from the s$_{1/2}$ and p$_{3/2}$ shells in $^{12}$C. With this experiment we wanted to exploit the predicted difference between the local nuclear densities exhibited by protons when bound in s$_{1/2}$ and p$_{3/2}$ shells to study possible density-dependent in-medium modifications of proton's electromagnetic form factors. Within the uncertainties of our measurements we observed no such modification and found a relatively good agreement between experimental results and the predicted polarization components calculated in relativistic distorted-wave impulse approximation (RDWIA).20212021-02-13 08:15:02Doktorsko delo/naloga124741sl