Coherent Compton scattering on light nuclei in the ∆-resonance region is studied in the impulse approximation and is shown to be a sensitive probe of the in-medium properties of the ∆ resonance. The elementary amplitude on a single nucleon is calculated from the unitary K-matrix approach developed previously. Modifications of the properties of the ∆ resonance due to the nuclear medium are accounted for through the self-energy operator of the ∆, calculated from the one-pion loop. The dominant medium effects such as the Pauli blocking, mean-field modification of the nucleon and ∆ masses, and particle-hole excitations in the pion propagator are consistently included in nuclear matter.
Physical Review C
- Pub Date:
- January 2002
- Photon absorption and scattering;
- Elastic and Compton scattering;
- Nuclear Theory
- 30 pages, 11 figures, accepted for publication in Phys. Rev. C