Precise measurements of atmospheric muon fluxes with the BESS spectrometer

M. Motoki, T. Sanuki, S. Orito, K. Abe, K. Anraku, Y. Asaoka, M. Fujikawa, H. Fuke, S. Haino, M. Imori, K. Izumi, T. Maeno, Y. Makida, N. Matsui, H. Matsumoto, H. Matsunaga, J. Mitchell, T. Mitsui, A. Moiseev, J. NishimuraM. Nozaki, J. Ormes, T. Saeki, M. Sasaki, E. S. Seo, Y. Shikaze, T. Sonoda, R. Streitmatter, J. Suzuki, K. Tanaka, I. Ueda, J. Z. Wang, N. Yajima, T. Yamagami, A. Yamamoto, Y. Yamamoto, K. Yamato, T. Yoshida, K. Yoshimura

Research output: Contribution to journalArticlepeer-review

58 Citations (Scopus)

Abstract

The vertical absolute fluxes of atmospheric muons and muon charge ratio have been measured precisely at different geomagnetic locations by using the BESS spectrometer. The observations had been performed at sea level (30 m above sea level) in Tsukuba, Japan, and at 360 m above sea level in Lynn Lake, Canada. The vertical cutoff rigidities in Tsukuba (36.2°N, 140.1°E) and in Lynn Lake (56.5°N, 101.0°W) are 11.4 and 0.4 GV, respectively. We have obtained vertical fluxes of positive and negative muons in a momentum range from 0.6 to 20 GeV/c with systematic errors <3% in both measurements. By comparing the data collected at two different geomagnetic latitudes, we have seen an effect of cutoff rigidity. The dependence on the atmospheric pressure and temperature, and the solar modulation effect have been also clearly observed. We also clearly observed the decrease of charge ratio of muons at low momentum side with at higher cutoff rigidity region.

Original languageEnglish
Pages (from-to)113-126
Number of pages14
JournalAstroparticle Physics
Volume19
Issue number1
DOIs
Publication statusPublished - 2003 Apr
Externally publishedYes

Keywords

  • Atmospheric muon
  • Atmospheric neutrino
  • Superconducting spectrometer

ASJC Scopus subject areas

  • Astronomy and Astrophysics

Fingerprint Dive into the research topics of 'Precise measurements of atmospheric muon fluxes with the BESS spectrometer'. Together they form a unique fingerprint.

Cite this