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SUMMARY:VIRTUAL INPA SEMINAR | Andreas Biekert (UC Berkeley)
DESCRIPTION:Speaker: Andreas Biekert (UC Berkeley) \nTitle: Scintillation Yield From Electronic and Nuclear Recoils In Superfluid 4He  \nAbstract: \nHeRALD is a proposed sub-GeV scale dark matter detector based on a superfluid 4He target and transition edge sensor readout\, supported as part of the TESSERACT project. Possible signal channels available for readout include prompt photons\, triplet excimers\, and roton and phonon quasiparticles\, but the relative strength of these signals for low energy nuclear recoils requires experimental verification. We have measured the superfluid 4He scintillation yield at 1.75 K from nuclear recoils in the range of 50-1100 keV using a 16 cm3 target volume read out by six superfluid-immersed PMTs. Elastic scattering of 2.8 MeV neutrons produced by a deuterium-deuterium neutron generator and Compton scattering of 662 keV 137Cs gamma rays were used to determine the relative scintillation yield. Yields of both prompt and delayed scintillation components were measured and compared to a semi-empirical response model based on helium-helium and electron-helium scattering cross sections. We also discuss the development of a 24 keV neutron source to extend our measurements to smaller nuclear recoil energies. \nJoin Zoom Meeting https://lbnl.zoom.us/j/91625792208?pwd=WGhqZ29TVlQxMHpnVXpqRDJVNXNBZz09 \nMeeting ID: 916 2579 2208  \nPasscode: 793885
URL:https://inpa.lbl.gov/event/virtual-inpa-seminar-andreas-biekart-uc-berkeley/
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