Speaker
Description
For direct dark matter search experiments, radiogenic neutrons from
the detector materials are one of the most significant background
sources, since they mimic nuclear recoil signals by weakly interacting
massive particles.
In the XENONnT experiment, the xenon dual-phase time projection
chamber (TPC) is enclosed by a gadolinium-doped water Cherenkov
detector, neutron veto (nVeto), to tag such neutrons by detecting
Cherenkov lights from Compton-scattered gamma rays released after the capture of
neutrons on gadolinium or hydrogen.
The XENONnT nVeto showed the neutron tagging efficiency of (53±3)% in
its pure water phase, and almost 80% in its 0.02% gadolinium-loaded
phase (preliminary).
In this poster, details of the detector configuration, the calibration
method to estimate the tagging efficiency, and the achieved results
are presented.
| Collaboration you are representing | XENON |
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