Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session J10: Tonne Scale Neutrinoless Double Beta Decay R&D IV
1:30 PM–3:18 PM,
Sunday, April 14, 2019
Sheraton
Room: Governor's Square 12
Sponsoring
Units:
DNP DPF
Chair: Jason Detwiler, University of Washington
Abstract: J10.00009 : LIquid Xenon Optical Characterization (LIXO)*
3:06 PM–3:18 PM
Presenter:
Arun Kumar Soma
(University of Alabama)
Author:
Arun Kumar Soma
(University of Alabama)
Collaboration:
nEXO collaboration
The next generation of Enriched Xenon Observatory (nEXO) is ~5t liquid xenon experiment for studies of neutrinoless double beta decay of 136Xe. Liquid xenon (LXe) scintillates in vacuum ultraviolet region (VUV). nEXO plans to use SiPM as photon detectors. Not enough information is available about reflective properties of materials and photon detectors in VUV region, which complicates optimization of light collection and detection in nEXO. LIXO is a dedicated setup constructed at the University of Alabama aimed to measure reflectivity of active (SiPM) and passive samples (Teflon,PEEK) as a function of angle in LXe. The setup can also measure photon detection efficiency (PDE) of photon sensors as a function of angle in LXe. In LIXO, spontaneous nuclear fission of 252 Cf excites LXe to produce ~178 nm light. The light is incident onto the sample to be investigated. The reflected light is measured with SiPM's to obtain specular and diffused reflectivity. A dedicated SiPM is used to monitor light stability and to trigger on light flashes produced by spontaneous fission. Further details of the experimental setup, first preliminary results on reflectivity and PDE of SiPM’s from Hamamatsu and FBK will be presented.
*Nuclear Physics, DOE's Office of Science under grant number 26643
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