Dark matter search using charge amplification in liquid xenon
The XMASS detector also offers scalability benefits over gas-liquid two-phase xenon detectors as the charge amplification factor changes within these unless the liquid level at the phase boundary is kept constant at all times. This problem is exacerbated as the size of the detector increases, making it difficult to scale up these detectors to useful sizes. Furthermore, the necessity for the presence of a liquid/gas boundary restricts the possible shape formats of these detectors. The XMASS detector has a spherical shape, making it easy to scale up. However, this too offers a challenge due to its tendency to mis-reconstruct the location of scattering events, especially when these occur on the surface of the detector. Professor Hiroyuki Sekiya and his team from the Kamioka Observatory have discovered that the solution for this drawback is to use charge amplification in the liquid. This not only overcomes these obstacles, but also improves sensitivity to dark matter.
Keywords: AXION; CHARGE AMPLIFICATION; DARK MATTER CANDIDATES; ELECTRON-SCATTERING EVENTS; HEAVY SUPER-SYMMETRIC PARTICLES; LIQUID XENON SCINTILLATION DETECTOR; LIQUID/GAS BOUNDARY; LOCATION OF SCATTERING EVENTS; NEUTRINO OBSERVATORY; SHAPE FORMATS; SUPER-BOSONIC WEAKLY-INTERACTING MASSIVE PARTICLES (WIMPS); SUPER-KAMIOKANDE; VERY LOW ENERGY SOLAR NEUTRINOS; XMASS; XMASS DETECTOR
Document Type: Research Article
Publication date: 01 December 2018
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