The superconducting toroidal spectrometer for hypernuclear studies at KEK-PS

A. Kawachi, H. Tamura, J. Imazato, M. Aoki, J. Chiba, Y. Fujita, R. S. Hayano, T. Ishikawa, K. Kubota, J. M. Lee, T. Miyamoto, H. Outa, I. S. Park, Y. Shimizu, T. Yamazaki

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


A spectrometer using a toroidal magnet with 12 superconducting coils was constructed at the north experimental hall of the KEK 12 GeV proton synchrotron. The spectrometer comprised 12 individual sectors surrounding the target point and served to measure π momentum for the purpose of hypernuclear studies via the (stopped K-, π-) reaction. A large solid angle of more than 6% × 4πstr was achieved in a wide momentum range between 180 and 350 MeV/c at the maximum 1.8 T magnetic excitation, and in a range between 70 and 150 MeV/c at 0.65 T. A momentum resolution of 1.5 MeV/c FWHM was measured at 205 MeV/c, and a resolution around 3MeV/c FWHM at 130-200 MeV/c was obtained including energy loss fluctuation in the experimental thick targets.

Original languageEnglish
Pages (from-to)253-262
Number of pages10
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number2-3
Publication statusPublished - 1998 Nov 21


  • Hypernuclei
  • Magnetic spectrometer
  • Superconducting magnet
  • Tracking chambers

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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