XMASS is a multipurposephysics experiment inJapan. It is a largecryogenic storage dewar, a tank of liquidxenon equipped with photosensors monitoring flashes of light that might be caused by interactions with hypotheticaldark matter particles. Unlike acryogenic particle detector, it operates at temperatures relatively far fromabsolute zero (specifically, 165 K (−163 °F)).[1] In addition to searching for dark matter, XMASS is also studying neutrinoless double beta decay and solar neutrinos. The project is conducted by a team atInstitute for Cosmic Ray Research,University of Tokyo.[2]
Its results have not confirmed the annual variation seen in some earlier experiments.[3]
Construction started in April 2007. The detector was completed in September 2010. Commissioning run was conducted between October 2010 and June 2012. Scientific data taking begun in November 2013. The detector is sometimes calledXMASS-I, as it is planned to be superseded by an upgrade calledXMASS-1.5 (a 5-ton detector) and eventuallyXMASS-II (24 ton detector).
The XMASS-I experiment shut down and ceased data taking 20 February 2019.
Results were published in 2021.[4]
The detector is located 1000m underground in theKamioka Observatory in Japan. It contains about 800 kg of xenon.[5]
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