Abstract
Two high-energy photon beamlines, LEPS and LEPS2, have been operated at SPring-8. In both beamlines, linearly polarized photon beams up to 2.9 GeV produced by laser-induced backward Compton scattering from 8 GeV electrons have been used to study quark-nuclear physics via the photo-production of hadrons. In this article, I present some recent results from LEPS including the coherent ø photoproduction from 4He and γp → π− Δ++ reaction, and report on the current status of the developments of the LEPS2 solenoid spectrometer.
Highlights
A photon beam in the multi-GeV energy region is a unique tool to investigate hadrons because it acts as a flavor-independent virtual qqpair beam with JPC = 1−−
Photons produced by laser-induced backward Compton scattering (BCS) have some advantages
The energy distribution is rather flat so that the backgrounds from low energy photons are much less than the Bremsstrahlung photon beam
Summary
The typical intensity of the photon beam was 3×106/sec (2×105/sec) in the energy region of 1.52.4 GeV (1.5-2.9 GeV) [2]. These energies are suitable to study photoproductions of the φ mesons and hyperon resonances near the thresholds. In the LEPS2 facility, large acceptance detectors have been prepared to measure precisely both the photoproduction process and decay process simultaneously. [3] After the summer in 2016, we switched the main detector system for the LEPS2 experiments from BGOegg to the large acceptance solenoid spectrometer, and have started installation of parts of detectors into the solenoid magnet and developed a new data acquisition (DAQ) system. The detector system has not been the full setup yet, the commissioning run with beam has been started
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