Trinucleon photonuclear reactions withΔ-isobar excitation: Processes below pion-production threshold

Compton scattering from the deuteron below pion-production threshold

Pion interaction with the trinucleon up to the eta production threshold.

Pion elastic, charge exchange scattering and induced eta production on the trin-ucleon systems are investigated in a coupled-channels approach in momentum space with Fadeev wave functions. The channel πN → ηN is included using an isobar model with S-, P-, and D-wave resonances. While the coherent reactions like 3 He(π, π) 3 He can be reasonably well reproduced up to T π =500 MeV, large discrepa...

Deuteron Compton Scattering below Pion Photoproduction Threshold

Deuteron Compton scattering below pion photoproduction threshold is considered in the framework of the non-relativistic diagrammatic approach with the Bonn OBE potential. The complete gauge-invariant set of diagrams is taken into account which includes resonance diagrams without and with rescattering and diagrams with oneand two-body seagulls. The obtained results are compared with predictions ...

Double Pion Production Reactions

We report on reactions producing two pions induced by real and virtual photons or nucleons. The role of different resonances in these reactions is emphasized. Novel results on coherent 2π photoproduction in nuclei are also reported. 1 Double pion photoproduction on the nucleon. The γN → π+π−N reaction is attracting attentions of both theoretical and experimental groups and is bound to play a si...

Novel soft - photon analysis of pp γ below pion - production threshold

A novel soft-photon amplitude is proposed to replace the conventional Low soft-photon amplitude for nucleon-nucleon bremsstrahlung. Its derivation is guided by the standard meson-exchange model of the nucleon-nucleon interaction. This new amplitude provides a superior description of ppγ data. The predictions of this new amplitude are in close agreement with potential-model calculations, which i...