Comparison of recoil polarization in the C12(e→,e

Measurements of the electron-helicity asymmetry in the quasi-elastic A(e→,e′p)<

“…proton-polarimeter and spinprecession cuts). This results in much higher event tally compared to those measurements [11][12][13][14][15][16][17].…”

“…These two methods of beampolarization measurement produced mutually consistent results as described in [12,13,15,16]. The target used for the 2 H measurements was a 50 mm long oblong cell filled with liquid deuterium [11][12][13] while the 12 C target consisted of three 0.8 mm-thick graphite foils [14][15][16]. We also performed calibration runs using a liquidhydrogen target.…”

“…The beam polarization was measured periodically with a Møller polarimeter [22,23], and verified by a Mott polarimetry measurement [24]. These two methods of beampolarization measurement produced mutually consistent results as described in [12,13,15,16]. The target used for the 2 H measurements was a 50 mm long oblong cell filled with liquid deuterium [11][12][13] while the 12 C target consisted of three 0.8 mm-thick graphite foils [14][15][16].…”

“…The electron spectrometer was equipped with a Čerenkov detector in order to distinguish the scattered electrons from other types of particles. More details of the experiment can be found in [11][12][13][14][15][16].…”

“…A series of measurements of the A( e, e p) reaction was performed at the Mainz Microtron (MAMI) using 2 H and 12 C targets. The polarization transfer to the knock-out proton was measured to investigate the properties of deeply bound (highly off-mass-shell) protons in the nucleus [11][12][13][14][15][16]. In search of deviations of the form factors of a bound proton from the free proton ones these measurements have been compared to calculations which are sensitive to this ratio.…”