Solar Neutrino Measurement at SK-III

TL;DR

This paper reports on the solar neutrino measurements at Super-Kamiokande-III, highlighting improvements in detector performance, background reduction, and systematic error reduction, leading to more precise solar neutrino data collection.

Contribution

It introduces enhanced hardware and software for SK-III, achieving lower energy thresholds and reduced systematic errors in solar neutrino measurements.

Findings

Reduced low energy backgrounds compared to earlier periods

Nearly halved systematic errors

Achieved 4.5 MeV energy threshold for analysis

Abstract

The full Super-Kamiokande-III data-taking period, which ran from August of 2006 through August of 2008, yielded 298 live days worth of solar neutrino data with a lower total energy threshold of 4.5 MeV. During this period we made many improvements to the experiment's hardware and software, with particular emphasis on its water purification system and Monte Carlo simulations. As a result of these efforts, we have significantly reduced the low energy backgrounds as compared to earlier periods of detector operation, cut the systematic errors by nearly a factor of two, and achieved a 4.5 MeV energy threshold for the solar neutrino analysis. In this presentation, I will present the preliminary SK-III solar neutrino measurement results.