Reopening of Research Activities on Strangeness Nuclear Physics at J-PARC

Recovery of the Japan Proton Accelerator Research Complex (J-PARC) Hadron Experimental Facility from the radioactive material leakage incident occurred on 23 May 2013 is reported. After long-term efforts for renovation of the facility, we completed it at the end of March 2015 and then restarted the beam operation of the facility on 9 April 2015. Experiments with slow extraction beams started on 24 April 2015. The beam intensity delivered to the Hadron Experimental Facility reached approximately 42 kW by the end of 2015, which is almost twice higher than the beam power before the incident. Recent new activities especially on strangeness nuclear physics in the Hadron Experimental Facility are also summarized briefly in this report.