Precision Spectroscopy of Kaonic Helium-3 Atoms X-rays at J-PARC

¹ RIKEN Nishina Center, RIKEN, Saitama 351-0198, Japan
² Department of Physics, Seoul National University, Seoul, 151-742, South Korea
³ Stefan Meyer Institut für subatomare Physik, A-1090 Vienna, Austria
⁴ Laboratori Nazionali di Frascati, INFN, I-00044 Frascati, Italy
⁵ Research Center for Nuclear Physics (RCNP), Osaka University, Osaka, 567-0047, Japan
⁶ Department of Physics, Kyoto University Kyoto 606-8502, Japan
⁷ Department of Physics, The University of Tokyo, Tokyo 113-0033, Japan
⁸ IPNS, High Energy Accelerator Research Organization (KEK), Ibaraki 305-0801, Japan
⁹ Department of Physics, Tokyo Institute of Technology, Tokyo, 152-8551, Japan
¹⁰ Technische Universiät München, D-85748, Garching, Germany
¹¹ Graduate School of Arts and Sciences, The university of Tokyo, Tokyo, 153-8902, Japan

^a e-mail: iio@riken.jp

Abstract

We will measure the Balmer-series x-rays of kaonic-³He atoms using large-area high-resolution silicon drift x-rays detectors in order to provide the crucial information of K⁻-nucleus strong interaction at the low energy limit. The strong interaction 2p level shift will be determined with a precision of a few eV. At the present status, the construction of all detectors is in progress. In February, 2009, the first tuning of K1.8BR beamline was performed by the secondary beam generated in J-PARC hadron facility. The data taking will be started soon.