6533b872fe1ef96bd12d3101
RESEARCH PRODUCT
Coherent $\eta$-photoproduction on $^4$He and $^{12}$C in the near-threshold region
Hartmuth ArenhövelA. Fixsubject
PhysicsCoupling constantNuclear and High Energy PhysicsParticle physicsMesonNuclear TheoryNuclear TheoryResonancePropagatorNuclear physicsAmplitudeIsospinHigh Energy Physics::ExperimentVector mesonNucleonNuclear Experimentdescription
Coherent $\eta$ meson photoproduction on $^4$He and $^{12}$C is considered in the near-threshold region. The elementary $\eta$ photoproduction operator includes contributions from the $S_{11}(1535)$ and $D_{13}(1520)$ resonances as well as $t$-channel vector meson exchange and the nucleon pole terms. Due to the suppression of the dominant $S_{11}(1535)$ resonance for spin and isospin saturated nuclei, the reaction is mainly governed by $\omega$ exchange. Furthermore, the influence of Fermi motion and of different prescriptions for the choice of the invariant reaction energy $W_{\gamma N}$ in the elementary amplitude is studied.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1997-02-28 |