Abstract
A neutron beamline for the study of fundamental physics has been constructed at the spallation neutron source of the Japan Proton Accelerator Research Complex (J-PARC). In-flight measurement of the neutron lifetime and the development of the transport optics of ultracold neutrons are in progress. The present status of the beamline and these experiments is reported.
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1 High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0802, Japan
2 Institute for the Promotion of Excellence in Higher Education, Kyoto University, Yoshida, Kyoto 606-8501, Japan
3 Department of Physics, University of Tokyo, Bunkyo, Tokyo 113-0033, Japan
4 Research Reactor Institute, Kyoto University, Kumatori, Osaka Kyoto 590-0494, Japan
5 Nishina Center, RIKEN, Wako, Saitama 351-0198, Japan
6 Department of Physics, Kyoto University, Kyoto 606-8502, Japan
7 Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
8 International Center for Elementary Particle Physics, University of Tokyo, Bunkyo, Tokyo 113-0033, Japan
9 Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
10 Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
11 Department of Physics, Nagoya University, Nagoya 464-8602, Japan
12 Department of Physics, Kyushu University, Fukuoka 812-8581, Japan