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Abstract
High-resolution spectrometers for both incident beams and scattered particles have been constructed at the K1.8 beam line of the Hadron Experimental Facility at J-PARC. A point-to-point optics is realized between the entrance and exit of QQDQQ magnets for the beam spectrometer. Fine-pitch wire chamber trackers and hodoscope counters are installed in the beam spectrometer to accept a high rate beam up to 107 Hz. The superconducting kaon spectrometer for scattered particles was transferred from KEK with modifications to the cryogenic system and detectors. A missing-mass resolution of 1.9 ± 0.1 MeV/c2 (FWHM) was achieved for the Σ peaks of (π±,K+) reactions on a proton target in the first physics run of E19 in 2010.
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Details
1 Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
2 Department of Physics, Kyoto University, Kyoto 606-8502, Japan
3 Dipartimento Scienza Applicata e Tecnologia, Politecnico di Torino, 24 Torino, Italy
4 Department of Physics and Astronomy, The University of New Mexico, Albuquerque, NM 87131-0001, USA
5 Dipartmento di Fisca, Universitá di Torino, Torino I-10125, Italy; INFN, Sezione di Torino, Torino I-10125, Italy
6 Department of Physics, Tohoku University, Sendai 980-8578, Japan
7 Joint Institute for Nuclear Reserch, Dubna, Moscow Region 141980, Russia
8 INFN, Sezione di Torino, Torino I-10125, Italy
9 Fakultät für Physik, University of Freiburg, Freiburg D-79104, Germany
10 Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
11 RIKEN Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, Japan
12 Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea
13 Department of Physics, The University of Tokyo, Bunkyo, Tokyo 113-0033, Japan
14 J-PARC Center, Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki 319-1195, Japan
15 Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki, Osaka 567-0047, Japan