Low energy electronic recoils and single electron detection with a liquid Xenon proportional scintillation counter

Liquid xenon (LXe) is a well-studied detector medium to search for rare events in dark matter and neutrino physics. Two-phase time projection chambers (TPCs) can detect electronic nuclear recoils with energy down kilo-electron volts (keV). In this paper, we characterize the response of single-phase liquid proportional scintillation counter (LXePSC), which produces electroluminescence directly liquid, at low energies. Our design uses thin (10 - 25 $\mu$m diameter), central anode wire cylindrical LXe target where ionization electrons, created from radiation particles, drift radially towards anode, produced. Both primary (S1) (S2) are detected by photomultiplier tubes (PMTs) surrounding target. Up 17 photons produced per electron, obtained 10 diameter wire, allowing highly efficient detection beta decays tritium source roughly 1 keV. Single photo-emission cathode wires, observed gain 1.8 photoelectrons (PE) electron. The delayed signals following S2 dominated single-photon-like hits, without evidence electron two-phase TPCs. We discuss potential application such LXePSC reactor via Coherent Elastic Neutrino Nucleus Scattering (CE$\nu$NS).