Abstract
The XMASS program at Kamioka Observatory uses self-shielding liquid xenon scintillation detectors to search for dark matter, double beta decay, and ultimately low energy solar neutrinos. For the next stage in this program, we envision building alt fiducial volume detector: XMASS 1.5. The upgraded detector design reflects our experience with the current XMASS detector. The new design requires PMTs that can intercept light traveling parallel to the inner detector surface. The first batch of these new PMTs has passed the performance verification test.
Highlights
Background from Liquid Xenon85Kr (
XMASS-1.5 is the next step of the running XMASS-I
1 t. Measures to counteract background have been developed to reect our best knowledge with the running detector
Summary
XIV International Conference on Topics in Astroparticle and Underground Physics Torino, Italy. The outer water Cherenkov detector will be reused in XMASS-1.5
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