Speaker
Description
The BGOegg experiment located at SPring-8 Synchrotron radiation facility in Japan was started since April 2014. The main goal of the experiment is to study the photoproduction of hadrons from the interaction of high energy photon and several targets like carbon, liquid hydrogen. For the purpose of measuring the recoiled proton from the reaction p(γ,p)X, where X is a meson, we have built a large Time of Flight detector (ToF) system based on the Resistive Plate Chamber (RPC). The ToF-RPC system of BGOegg experiment contains 32 separated RPC chambers which are aligned to cover an area of 6.4m2 in the forward region. The development and the prototype testing of the detector have been finalized in 2013, we started the mass production in the beginning of 2014. After establishing a suitable calibration method, we have obtained the first physics data from RPC. The initial analysis of the data show excellent performance of RPC in the experiment in term of proton selection, proton velocity measurement. Since we do not have any other detectors which are effectively able to separate proton from other charged particles flying forward, RPC data become very important. Furthermore, A good measurement of the recoiled proton in the two-body reaction, p(γ,p)X, given by RPC is useful to recalibrate the initial photon energy measuring by a tagging counter. At RPC workshop 2016, we would like to report about the current working status of our RPCs, the benefits of using RPC at the BGOegg experiment. Other aspects like selecting recoiled proton in the extreme forward angle from several 2-body reactions, proton missing mass analysis obtained from RPC will also be presented.
