Abstract
In this work, we are presenting a combination of two preliminary results for quasi-free photoproduction of η-mesons from the liquid deuterium and 3 He targets for incident photon energies from threshold up to 1.4 GeV. The experiments were performed at the Mainz MAMI electron accelerator, using the Glasgow tagged photon facility. Decay photons of the η-mesons and the recoil nucleons were detected with an almost 4π covering electromagnetic calorimeter combining the Crystal Ball and TAPS detectors. The data from both targets show a narrow structure in the excitation function of γ + n → n + η. The results from the two measurements are consistent within the expected effects from nuclear Fermi motion.
Highlights
We are presenting a combination of two preliminary results for quasi-free photoproduction of η-mesons from the liquid deuterium and 3He targets for incident photon energies from threshold up to 1.4 GeV
We report preliminary results from two different experiments performed at the tagged-photon beam facility at MAMI
The target was surrounded by a cylindrical plastic scintillator strip detector,[14] which was used for charged particle identification, and the spherical electromagnetic calorimeter Crystal Ball.[15]
Summary
We are presenting a combination of two preliminary results for quasi-free photoproduction of η-mesons from the liquid deuterium and 3He targets for incident photon energies from threshold up to 1.4 GeV. The experiments were performed at the Mainz MAMI electron accelerator, using the Glasgow tagged photon facility. Decay photons of the η-mesons and the recoil nucleons were detected with an almost 4π covering electromagnetic calorimeter combining the Crystal Ball and TAPS detectors.
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