“…Many additional details about the apparatus are given in Refs. ͓1,4,8,9͔ In run period II, a new neutron counter hodoscope was installed in the polarimeter arm, and it became fully operational for run periods III and IV. The hodoscope detected protons and consisted of 11 bars of scintillator, each with cross sectional area 8͑h͒ϫ20͑w͒ cm 2 and length 137 cm, with photomultipliers mounted on each end.…”