Detector response model based on multi-scatter neutron calibration in the LUX-ZEPLIN experiment
ORAL
Abstract
The LUX-ZEPLIN (LZ) experiment uses a dual-phase liquid xenon time projection chamber (TPC) to primarily detect low-energy nuclear recoils (NRs) from signals such as WIMP dark matter particle interactions and boron-8 solar neutrinos. Particle interactions in the LZ TPC generate scintillation and ionization signals, both of which can be measured by arrays of photomultiplier tubes. Accurate calibration of the microphysics of interactions in the TPC is critical for the construction of the detector response model to characterize these signals from low-energy NRs. In this work, we selected double-scatter NR events from 2.45 MeV neutrons generated by a deuterium-deuterium (DD) generator source. Using scattering angle measurements derived from the reconstructed double-scatter vertices, we estimate the nuclear recoil energy and calculate the corresponding ionization yield, a key component of the response model. This analysis provides crucial information to determine the LZ detector sensitivity to low-energy NR signals.
*This work is supported by the US DOE Office of Science, Office of High Energy Physics; the U.K. Science & Technology Facilities Council; Portuguese Foundation for Science and Technology; the Institute for Basic Science, Korea; the Swiss National Science Foundation; and the Australian Research Council Centre of Excellence for Dark Matter Particle Physics.
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Presenters
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Yen-Ting Chin
- Penn State University