6533b873fe1ef96bd12d5f94
RESEARCH PRODUCT
Threshold enhancement in η photoproduction from 2H and 4He
B. KruscheJ. R. M. AnnandA. SchmidtR. W. NovotnyV. MetagU. SiodlaczekM. KotullaV. HejnyV. Olmos De LeónV. KuhrMatthias WolfMartin SchumacherJ. WeißF. WissmannR. BeckJ. AhrensPatrick AchenbachR. LeukelF. RamboH. StröherI. J. D. Macgregorsubject
PhysicsNuclear and High Energy Physics010308 nuclear & particles physicsNuclear TheoryHadron01 natural sciences7. Clean energyNuclear physicsMomentumElectromagnetic calorimeter0103 physical sciencesNuclear fusionHigh Energy Physics::ExperimentAtomic physicsPhoton beamNuclear Experiment010306 general physicsdescription
The photoproduction of η-mesons from 2H and 4He has been studied for energies close to the production thresholds. The experiments were carried out with the tagged photon beam of the Mainz MAMI accelerator. The η-mesons were detected via their two photon decays with the electromagnetic calorimeter TAPS. Total cross-sections, angular and momentum distributions of the η-mesons have been determined for both reactions. The total cross-sections in the threshold region show a large enhancement over the predictions of a participant-spectator model, indicating significant final-state interaction effects. The results are compared to recent model calculations taking into account nucleon-nucleon and nucleon-η final-state interaction effects on different levels of sophistication.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2002-04-01 | The European Physical Journal A |