XMASS

TL;DR

The paper discusses the development and R&D of the XMASS detector, a large liquid Xenon scintillator designed for dark matter searches with ultra-low background technology and high sensitivity.

Contribution

It presents the design, R&D results, and prospects of an 800 kg liquid Xenon detector for dark matter detection, highlighting ultra-low background techniques.

Findings

Successful development of ultra-low background technologies.

Projected sensitivity of $10^{-45} { m cm}^2$ for dark matter detection.

Feasibility demonstrated with a 100 kg prototype.

Abstract

The XMASS detector is a large single phase liquid Xenon scintillator.After its feasibility had been studied using a 100 kg size prototype detector, an 800 kg size detector is being built for dark matter search with the sensitivity of $10^{-45} {\rm cm}^2$ region in spin-independent cross section. The results of R\&D study for 800 kg detector, especially ultra low background technologies, and the prospects of the experiment are described.