“…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].…”