The Threshold Photoproduction of pi0 on Nucleons and on Few Nucleon Systems

Argan, P. ; Audit, G. ; Bloch, A. ; et al.
Phys.Lett.B 206 (1988) 4, 1988.
Inspire Record 251858 DOI 10.17182/hepdata.29971

The absolute value of the π 0 photoproduction cross section on the proton recently measured near threshold enables to reanalyze previous data collected on 2 H, 3 He, and 4 He relatively to the proton. Absolute cross sections are presented for these nuclei in the energy region extending up to 10 MeV above threshold. The threshold s-wave amplitudes for 2 H and 3 He thus obtained are discussed in relation with the neutron threshold amplitude E ( nπ 0 ) 0+ value.

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