Cosmic-ray test of a time-of-flight detector for double-strangeness experiments at J-PARC

S. H. Kim, S. H. Hwang, J. K. Ahn, H. Ekawa, S. Hayakawa, B. Hong, K. Hosomi, K. Imai, M. H. Kim, J. Y. Lee, T. J. Moon, S. Y. Ryu, H. Sako, T. Takahashi, K. Tanida

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


We have developed a time-of-flight (ToF) array consisting of 24 plastic scintillators for triggering and timing measurements in a series of planned experiments to study double-strangeness hadronic and nuclear systems at the K1.8 beamline of J-PARC. Each ToF scintillator is 180 cm long with a cross-section of 8×3cm2, and is read out by H1949-50 photomultiplier tubes at both ends. The timing and attenuation properties of the scintillators are measured using cosmic-ray muons and β rays from 90Sr. The cosmic-ray muon events are triggered by three pairs of 120-cm-long plastic scintillators, sandwiching the ToF array. The intrinsic time resolutions of the scintillators are estimated to be in the range 60-100 ps, which is adequate for reliable separation between π and K at 1.2GeV/c. The attenuation length is measured to be approximately 210 cm, which is half that for a bulk scintillator.

Original languageEnglish
Pages (from-to)39-44
Number of pages6
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Publication statusPublished - 2015 Jun 10

Bibliographical note

Funding Information:
This research was supported by the National Research Foundation of Korea (Grant no. (2012R1A2A1A01011926) ), BK21-Plus Program (Initiative for Creative and Independent Scientist) , a Grant-in-Aid for Scientific Research on Innovative Areas from MEXT (Grant no. (24105002) ), and a Grant-in-Aid for Scientific Research (A) from JSPS (Grant no. (24244038) ).

Publisher Copyright:
© 2015 Elsevier B.V. All rights reserved.


  • Particle identification
  • Plastic scintillator
  • Time-of-flight detector

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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