Measurement of K L 0 flux at the J-PARC neutral-kaon beam line

K. Shiomi, K. Y. Baek, J. Comfort, E. Iwai, N. Kawasaki, J. W. Ko, T. K. Komatsubara, J. W. Lee, G. Y. Lim, Y. Maeda, T. Masuda, D. Naito, Y. Nakaya, H. Nanjo, T. Nomura, M. Sasaki, N. Sasao, K. Sato, T. Shimogawa, Y. SugiyamaY. Tajima, G. Takahashi, M. Togawa, H. Watanabe, T. Yamanaka, Y. Yanagida, H. Y. Yoshida

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


We describe the KL0 flux measurements performed at the J-PARC neutral-kaon beam line. This beam line was constructed for an experiment aiming to observe the CP-violating rare decay KL0→ π0νν̄. The primary proton energy was 30 GeV and the KL0 production angle was 16°. Prior to the physics run, the KL0 flux and spectrum were measured by counting KL0→ ππ-π0 decays with a simple setup, which was composed of an electromagnetic calorimeter and a hodoscope system. Results from these measurements are presented and compared with various hadron-interaction simulations.

Original languageEnglish (US)
Pages (from-to)264-271
Number of pages8
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number1
StatePublished - Feb 1 2012


  • J-PARC
  • K production

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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