First observation of isolated nuclear recoils following neutron capture for dark matter calibration

Abstract

Low-energy nuclear recoils (NRs) are hard to measure because they produce few e${}^{-}$/h${}^{+}$ pairs in solids -- i.e. they have low "ionization yield". A silicon detector was exposed to thermal neutrons over 2.5\,live-days, probing NRs down to 450\,eV. The observation of a neutron capture-induced component of NRs at low energies is supported by the much-improved fit upon inclusion of a capture NR model. This result shows that thermal neutron calibration of very low recoil energy NRs is promising for dark matter searches, coherent neutrino experiments, and improving understanding of ionization dynamics in solids.

arXiv comment10 pages, 6 figures, 1 table

References in corpus (22)

• emcee: The MCMC Hammer
• Light Dark Matter Search with Ionization Signals in XENON1T
• First results from the CRESST-III low-mass dark matter program
• CDMSlite: A Search for Low-Mass WIMPs using Voltage-Assisted Calorimetric Ionization Detection in the SuperCDMS Experiment
• Projected Sensitivity of the SuperCDMS SNOLAB experiment
• Migdal Effect in Dark Matter Direct Detection Experiments
• SENSEI: Direct-Detection Constraints on Sub-GeV Dark Matter from a Shallow Underground Run Using a Prototype Skipper-CCD
• Constraints on low-mass, relic dark matter candidates from a surface-operated SuperCDMS single-charge sensitive detector
• Probing sub-GeV Dark Matter with conventional detectors
• Directly detecting sub-GeV dark matter with electrons from nuclear scattering
• Light Dark Matter Search with a High-Resolution Athermal Phonon Detector Operated Above Ground
• Search for Low-Mass Dark Matter with CDMSlite Using a Profile Likelihood Fit
• The Two-Piece Normal, Binormal, or Double Gaussian Distribution: Its Origin and Rediscoveries
• Measurement of the ionization produced by sub-keV silicon nuclear recoils in a CCD dark matter detector
• Germanium response to sub-keV nuclear recoils: a multipronged experimental characterization
• Measurement of the low-energy quenching factor in germanium using an ${}^{88}$Y/Be photoneutron source
• Atomic limits in the search for galactic dark matter
• Improvement of Geant4 Neutron-HP package: from methodology to evaluated nuclear data library
• Extending light WIMP searches to single scintillation photons in LUX
• A measurement of the ionization efficiency of nuclear recoils in silicon
• Ionization yield measurement in a germanium CDMSlite detector using photo-neutron sources
• $\text{nrCascadeSim}$ -- A simulation tool for nuclear recoil cascades resulting from neutron capture

Cited by in corpus (8)

• First measurement of the nuclear-recoil ionization yield in silicon at 100 eV
• Observation of a nuclear recoil peak at the 100 eV scale induced by neutron capture
• Observation of a low energy nuclear recoil peak in the neutron calibration data of the CRESST-III Experiment
• Detection and Calibration of Low-Energy Nuclear Recoils for Dark Matter and Neutrino Scattering Experiments
• Intrinsic Fano factor of nuclear recoils for dark matter searches
• Neutron capture-induced silicon nuclear recoils for dark matter and CE$\nu$NS
• Neutron capture-induced nuclear recoils as background for CE$\nu$NS~measurements at reactors
• Novel coincidence detection technique for precision measurement of neutron-capture-induced nuclear recoils