Σp scattering experiment at J-PARC - results of commissioning run -

摘要

The Ep scattering experiment has just been started at J-PARC this year (2018). We made "E beam factory" a reality where a beam with an intensity of more than 5×10~5Σ~- beam per day could be produced by using 20 M/spill π~- beam. The CATCH system, which is a dedicated system to detect recoil proton from the Σp scattering, operated stably under the high counting rate, and its successful operation was confirmed by identifying the pp scattering events in J-PARC. In the June beam time, the production run of the Σ~-p scattering was carried out for 2 days, which was just 10% of the requested beam time. The remaining beam time of the Σ~-p channel and the Σ~+p channel will take place in the spring of 2019.