太陽ニュートリノの観測時刻情報を用いた太陽g-mode振動の探索

Outline of Final Research Achievements

In order to search for the periodic variation of solar neutrino flux originated the solar g-mode oscillation, solar neutrino data taken by the Super-Kamiokande detector was analyzed. At first, periodic signals whose phase is typically a few month are searched by using Lomb-Scargle method. However, no periodic signal was found in the solar neutrino data. To search for periodic signals of g-mode oscillations (typically 20-30 minutes), periodicities of background events in the solar neutrino data are investigated. One of background events is radioactive isotope produced by the decay of Radon dissolving into pure water. The other is spallation products cased by the cosmic ray muons.