Cross sections for [Formula Presented] have been measured at incident proton energies of 294.3, 299.3, 306.3, 314.1, and 319.2 MeV [Formula Presented] to investigate hadronic [Formula Presented] production near threshold. Pion angular distributions are presented for 294.3, 299.3, and 319.2 MeV. At 294.3 and 299.3 MeV they are consistent with isotropy, indicating [Formula Presented]-wave dominance for the angular momentum of the [Formula Presented] system. The shapes of the [Formula Presented], [Formula Presented], and [Formula Presented] invariant mass distributions provide further evidence for dominance of [Formula Presented]-wave mechanisms close to threshold. At 319.2 MeV significant anisotropy indicates contributions from higher partial waves. The total cross sections show an energy dependence consistent with an early partial conservation of axial current based calculation and with a recent calculation that considers only [Formula Presented]-wave contributions. Tentative values for the strongest contributing partial wave amplitudes are presented. © 1997 The American Physical Society.
Hardie, J. G., Dytman, S. A., Daehnick, W. W., Brooks, W. K., Flammang, R. W., Bland, L. C., Jacobs, W. W., Pancella, P. V., Rinckel, T., Brown, J. D., & Jacobsen, E. (1997). Kinematically complete measurement of [Formula Presented] near threshold. Physical Review C - Nuclear Physics, 20-37. https://doi.org/10.1103/PhysRevC.56.20