Nuclear coherent ${\pi }^0$ photoproduction with charge-exchange and spin-flip rescattering

Abstract

In this work, we present an updated model for nuclear ${\pi }^0$ photoproduction, which incorporates pion second-order rescattering on intermediate excited nuclear states. Our approach is based on the distorted wave impulse approximation in momentum space. The many-body medium effects are incorporated in the complex effective $\Delta$ self-energy, employing the results of the recently developed second-order pion-nucleus scattering potential. The experimental data for ${}^{12}$C and ${}^{40}$Ca are successfully described without the need to fit the model parameters of the photoproduction amplitude as a result of incorporating the second-order part of nuclear photoproduction potential, which involves intermediate nucleon spin-flip and charge exchange.

References in corpus (8)

• Unitary Isobar Model - MAID2007
• Electromagnetic excitation of the Delta(1232)-resonance
• Proton and neutron electromagnetic form factors and uncertainties
• Neutron density distributions from antiprotonic 208Pb and 209Bi atoms
• Chiral Effective-Field Theory in the Delta(1232) Region: Pion Electroproduction on the Nucleon
• Effective Lagrangian Approach to pion photoproduction from the nucleon
• Chiral symmetry restoration at high matter density observed in pionic atoms
• Momentum-space second-order pion-nucleus potential including medium effects in the $\Delta (1232)$ region

Cited by in corpus (1)

• Bridging reaction theory and nuclear structure in ${\pi }^{\pm }$-${}^{48}$Ca scattering