Journal
PHYSICAL REVIEW D
Volume 105, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.105.052004
Keywords
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Funding
- Canada Excellence Research Chairs Program
- Natural Sciences and Engineering Research Council of Canada [SAPIN-2017-00023]
- U.S. Department of Energy [DE-FG02-97ER41033]
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The NEWS-G collaboration used SPCs to measure the nuclear quenching factor in neon gas at 2 bar in a neutron beam at the TUNL facility. The results do not agree with expected values.
The NEWS-G collaboration uses spherical proportional counters (SPCs) to search for weakly interacting massive particles (WIMPs). In this paper, we report the first measurements of the nuclear quenching factor in neon gas at 2 bar using an SPC deployed in a neutron beam at the TUNL facility. The energy-dependence of the nuclear quenching factor is modeled using a simple power law: alpha E-nr(beta); we determine its parameters by simultaneously fitting the data collected with the detector over a range of energies. We measured the following parameters in Ne : CH4 at 2 bar: alpha = 0.2801 +/- 0.0050 (fit) +/- 0.0045 (sys) and beta = 0.0867 +/- 0.020 (fit) +/- 0.006 (sys). Our measurements do not agree with expected values from SLUM or Lindhard theory. We demonstrated the feasibility of performing quenching factor measurements at sub-keV energies in gases using SPCs and a neutron beam.
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