On-site background measurements for the J-PARC E56 experiment: A search for the sterile neutrino at J-PARC MLF

The J-PARC E56 experiment aims to search for sterile neutrinos at the J-PARC Materials and Life Science Experimental Facility (MLF). In order to examine the feasibility of the experiment, we measured the background rates of dierent detector candidate sites, which are located at the third oor of the MLF, using a detector consisting of plastic scintillators with a ducial