Jc. Bergstrom et al., MEASUREMENT OF THE H-1(GAMMA,PI(0)) CROSS-SECTION NEAR-THRESHOLD .2. PION ANGULAR-DISTRIBUTIONS, Physical review. C. Nuclear physics, 55(4), 1997, pp. 2016-2023
This paper represents a continuation of our earlier report on the meas
urement of the reaction H-1(gamma, pi(0)) in the threshold region (144
.7-169.3 MeV). More specifically we present pion angular distributions
reconstructed using information on the pi(0)-decay photon energies no
t previously utilized. Analysis of these distributions reconfirms most
of our previous conclusions. in particular, we confirm the rapid incr
ease in the real part of the S-wave multipole, ReE04 at energies above
the pi(+) threshold. New results for the P-wave amplitude P-1 are pre
sented.