Demonstration of neutron radiation-induced nucleation of supercooled water

Abstract

We present here direct evidence for neutrons causing nucleation of supercooled water. Highly purified water (20 nm filtration) is cooled to well below freezing (as low as -20 degrees C) with a radioactive calibration source of neutrons / gamma-rays either present or removed during each of many control cooling runs for the same volume of water. When it is primarily neutrons irradiating the sample bulk, the non-equilibrium freezing point (also known as the "supercooling point") is, on average, +0.7 degrees C warmer than the control equivalent, with a statistical significance of greater than 5 sigma, with systematic uncertainty included. This effect is not observed with water in the presence of gamma-rays instead of neutrons. While these neutrons should have theoretically had sufficient energy to mount the energy barrier, corroborating our results, their raising of supercooling temperature has never been reported experimentally to the best of our knowledge. The potential to use deeply supercooled solutions, not only water, as metastable detectors for radiation and perhaps dark matter or neutrino physics presents now a new avenue for exploration.

arXiv comment14 pages, 7 figures; pre-print, pre-acceptance version

References in corpus (11)

• Observation of Coherent Elastic Neutrino-Nucleus Scattering
• First dark matter search results from a 4-kg CF${}_3$I bubble chamber operated in a deep underground site
• Dark Matter Search Results from the PICO-60 C${}_3$F${}_8$ Bubble Chamber
• Dark Matter Search Results from the PICO-2L C${}_3$F${}_8$ Bubble Chamber
• Search for Light Dark Matter Interactions Enhanced by the Migdal effect or Bremsstrahlung in XENON1T
• The Astrophysical Uncertainties Of Dark Matter Direct Detection Experiments
• Design and Performance of the XENON10 Dark Matter Experiment
• Long-term deep supercooling of large-volume water via surface sealing with immiscible liquids
• Shrinking of Rapidly Evaporating Water Microdroplets Reveals their Extreme Supercooling
• Direct Measurement of the Bubble Nucleation Energy Threshold in a CF3I Bubble Chamber
• The effect of stirring on the heterogeneous nucleation of water and of clathrates of tetrahydrofuran/water mixtures

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