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Title: Development of a tagged source of Pb-206 nuclei

Abstract

There is a particular class of unavoidable backgrounds that plague low-background experiments and rare event searches, particularly those searching for nuclear recoil event signatures: decaying daughters of the 238U nuclear decay chain, which result from radon plate-out on detector materials. One such daughter isotope, 210Po, undergoes α-decay and produces a recoiling 103 keV 206Pb nucleus. In this study, to characterize this important background in the context of noble element detectors, we have implemented a triggered source for these 206Pb recoils in a dual-phase xenon time projection chamber (Xe TPC) within the Davis Xenon R&D testbed system (DAX). By adhering 210Po to the surface of a PIN diode and electrically floating the diode on the cathode of the TPC, we tag the α signals produced in the PIN diode and trigger on the correlated nuclear recoils in the liquid xenon (LXe). Lastly, we discuss our methods for 210Po deposition, electronic readout of the PIN diode signals at high voltage, and analysis methods for event selection.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Univ. of California, Davis, CA (United States)
Publication Date:
Research Org.:
Nuclear Science and Security Consortium, Berkeley, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation (NA-20)
OSTI Identifier:
1477497
Grant/Contract Number:  
NA0003180
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Instrumentation
Additional Journal Information:
Journal Volume: 13; Journal Issue: 02; Journal ID: ISSN 1748-0221
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats

Cutter, J., Godfrey, B., Hillbrand, S., Irving, M., Manalaysay, A., Minaker, Z., Morad, J., and Tripathi, M. Development of a tagged source of Pb-206 nuclei. United States: N. p., 2018. Web. doi:10.1088/1748-0221/13/02/C02017.
Cutter, J., Godfrey, B., Hillbrand, S., Irving, M., Manalaysay, A., Minaker, Z., Morad, J., & Tripathi, M. Development of a tagged source of Pb-206 nuclei. United States. doi:10.1088/1748-0221/13/02/C02017.
Cutter, J., Godfrey, B., Hillbrand, S., Irving, M., Manalaysay, A., Minaker, Z., Morad, J., and Tripathi, M. Tue . "Development of a tagged source of Pb-206 nuclei". United States. doi:10.1088/1748-0221/13/02/C02017. https://www.osti.gov/servlets/purl/1477497.
@article{osti_1477497,
title = {Development of a tagged source of Pb-206 nuclei},
author = {Cutter, J. and Godfrey, B. and Hillbrand, S. and Irving, M. and Manalaysay, A. and Minaker, Z. and Morad, J. and Tripathi, M.},
abstractNote = {There is a particular class of unavoidable backgrounds that plague low-background experiments and rare event searches, particularly those searching for nuclear recoil event signatures: decaying daughters of the 238U nuclear decay chain, which result from radon plate-out on detector materials. One such daughter isotope, 210Po, undergoes α-decay and produces a recoiling 103 keV 206Pb nucleus. In this study, to characterize this important background in the context of noble element detectors, we have implemented a triggered source for these 206Pb recoils in a dual-phase xenon time projection chamber (Xe TPC) within the Davis Xenon R&D testbed system (DAX). By adhering 210Po to the surface of a PIN diode and electrically floating the diode on the cathode of the TPC, we tag the α signals produced in the PIN diode and trigger on the correlated nuclear recoils in the liquid xenon (LXe). Lastly, we discuss our methods for 210Po deposition, electronic readout of the PIN diode signals at high voltage, and analysis methods for event selection.},
doi = {10.1088/1748-0221/13/02/C02017},
journal = {Journal of Instrumentation},
number = 02,
volume = 13,
place = {United States},
year = {2018},
month = {2}
}

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