Abstract
We plan to observe solar neutrons at Mt. Sierra Negra (4,600 m above sea level) in Mexico using the SciBar detector. This project is named the SciBar Cosmic Ray Telescope (SciCRT). The main aims of the SciCRT project are to observe solar neutrons to study the mechanism of ion acceleration on the surface of the sun and to monitor the anisotropy of galactic cosmic-ray muons. The SciBar detector, a fully active tracker, is composed of 14,848 scintillator bars, whose dimension is 300 cm × 2.5 cm × 1.3 cm. The structure of the detector enables us to obtain the particle trajectory and its total deposited energy. This information is useful for the energy reconstruction of primary neutrons and particle identification. The total volume of the detector is 3.0 m × 3.0 m × 1.7 m. Since this volume is much larger than the solar neutron telescope (SNT) in Mexico, the detection efficiency of the SciCRT for neutrons is highly enhanced. We performed the calibration of the SciCRT at Instituto Nacional de Astrofisica, Optica y Electronica (INAOE) located at 2,150 m above sea level in Mexico in 2012. We installed the SciCRT at Mt. Sierra Negra in April 2013 and calibrated this detector in May and August 2013. We started continuous observation in March 2014. In this paper, we report the detector performance as a solar neutron telescope and the current status of the SciCRT.
Highlights
The particle acceleration mechanism on the solar surface has been studied through multi-wavelength observations
SciBar Cosmic Ray Telescope (SciCRT) detector The SciBar detector was initially developed for the K2K neutrino oscillation experiment in Japan (Yoshida et al 1999)
1) If more than 1 of the 32 channel signals from one MAPMT exceed the threshold level energy, a hit signal is generated on the front-end board (FEB) and sent to the trigger board (TRGB) via the back-end board (BEB). 2) Several hit signals are collected on the TRGB
Summary
Performance of the SciBar cosmic ray telescope (SciCRT) toward the detection of high-energy solar neutrons in solar cycle 24. Yoshinori Sasai1*, Yuya Nagai, Yoshitaka Itow, Yutaka Matsubara, Takashi Sako, Diego Lopez, Tsukasa Itow, Kazuoki Munakata, Chihiro Kato, Masayoshi Kozai, Takahiro Miyazaki, Shoichi Shibata, Akitoshi Oshima, Hiroshi Kojima, Harufumi Tsuchiya, Kyoko Watanabe, Tatsumi Koi, Jose Francisco Valdés-Galicia, Luis Xavier González, Ernesto Ortiz, Octavio Musalem, Alejandro Hurtado, Rocio Garcia and Marcos Anzorena
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