I=1/2 S-wave scattering
Very nice agreement between model and data.
P. Estabrooks, Phys. Rev. D19, 2678 (1979),
P. Estabrooks et al., Nucl. Phys. B133, 490 (1978).
D. Aston et al., Nucl. Phys. B296, 493 (1988).