Low-threshold response of a scintillating xenon bubble chamber to nuclear and electronic recoils

Le résumé fourni par la source

A device filled with pure xenon first demonstrated the ability to operate simultaneously as a bubble chamber and scintillation detector in 2017. Initial results from data taken at thermodynamic thresholds down to $\ensuremath{\sim}4\text{ }\text{ }\mathrm{keV}$ showed sensitivity to $\ensuremath{\sim}20\text{ }\text{ }\mathrm{keV}$ nuclear recoils with no observable bubble nucleation by $\ensuremath{\gamma}$-ray interactions. This paper presents results from further operation of the same device at thermodynamic thresholds as low as 0.50 keV, hardware limited. The bubble chamber has now been shown to have sensitivity to $\ensuremath{\sim}1\text{ }\text{ }\mathrm{keV}$ nuclear recoils while remaining insensitive to bubble nucleation by $\ensuremath{\gamma}$-rays. A data-driven calibration of the chamber's nuclear recoil nucleation response, as a function of nuclear recoil energy and thermodynamic state, is presented. Stringent upper limits are established for the probability of bubble nucleation by $\ensuremath{\gamma}$-ray-induced Auger cascades, with a limit of $<1.1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$ set at 0.50 keV, the lowest thermodynamic threshold explored.

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