Search for periodic modulations of the solar neutrino flux in Super-Kamiokande-I

A search for periodic modulations of the solar neutrinoflux was performed using the Super-Kamiokande-I data taken from May 31st, 1996 to July 15th, 2001. The detector's capability of measuring the exact time of events, combined with a relatively high yield of solar neutrinoevents, allows a search for short-time variations in the observed flux. We employed the Lomb test to look for periodic modulations of the observed solar neutrinoflux. The obtained periodogramis consistent with statistical fluctuationand no significant periodicity was found.