• asymmetry
• neutron skin
• nuclear
• nucleus

The work of this thesis focuses on the measurement of the transverse asymmetry, carried out at the Mainz microtron accelerator (MAMI), for electron carbon scattering. The measurement consists in the determination of the transverse asymmetry using two Cherenkov detectors made of fused-silica materials coupled to 3 and 8 photo-multiplier tubes. The two detectors have been tested in the laboratory, together with the new electronics for the data read-out, that consist in the NINO-asic board with which the impulse signals coming from the detectors are acquired. The beam parameters, as the transverse position of the beam, the scattering angles, and the current intensity and energy are determined with particular accuracy because their variation over time can result in effects that overlap with the transverse asymmetry. This required the development of a new analysis program, processing the raw data to extract the beam parameters relevant for the analysis, and separating the contributions of the false asymmetries.
The work consisted in a first part dedicated to the calibration of the monitors, to measure the parameters of the beam. The second part was focused on the analysis of the data collected during the beam time, removing the outliers, identifying possible errors and isolating the contribution of false asymmetries.
The transverse asymmetry has been measured for electron-carbon scattering at a two fixed angles, + 22.5° and - 22.5°. The measured values are -21 +/- 5 (stat) ppm for detector B and 23.1 +/- 1.7 (stat) ppm for detector A.