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29 March 2024 |
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Article overview
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First Demonstration of a Scintillating Xenon Bubble Chamber for Dark Matter and CE$
u$NS Detection | D. Baxter
; C.J. Chen
; M. Crisler
; T. Cwiok
; C.E. Dahl
; A. Grimsted
; J. Gupta
; M. Jin
; R. Puig
; D. Temples
; J. Zhang
; | Date: |
28 Feb 2017 | Abstract: | A 30-gram xenon bubble chamber, operated at Northwestern University in June
and November 2016, has for the first time observed simultaneous bubble
nucleation and scintillation by nuclear recoils in liquid xenon. This chamber
is instrumented with a CCD camera for near-IR bubble imaging, a solar-blind PMT
to detect 175-nm xenon scintillation light, and a piezoelectric acoustic
transducer to detect the ultrasonic emission from a growing bubble. The
time-of-nucleation determined from the acoustic signal is used to correlate
specific scintillation pulses with bubble-nucleating events. The observed
single- and multiple-bubble rates when exposed to a $^{252}$Cf neutron source
indicate that, for a thermodynamic "Seitz" threshold of 8.3 keV, the minimum
nuclear recoil energy required to nucleate a bubble is between 11 and 25 keV.
This is consistent with the observed scintillation spectrum for
bubble-nucleating events. We see no evidence for bubble nucleation by gamma
rays at the thresholds studied, setting a 90% CL upper limit of
$6.3 imes10^{-7}$ bubbles per gamma interaction at a 4.2-keV thermodynamic
threshold. This indicates stronger gamma discrimination than in CF$_3$I bubble
chambers, supporting the hypothesis that scintillation production suppresses
bubble nucleation by electron recoils, while nuclear recoils nucleate bubbles
as usual. These measurements establish the noble-liquid bubble chamber as a
promising new technology for WIMP and CE$
u$NS detection. | Source: | arXiv, 1702.8861 | Services: | Forum | Review | PDF | Favorites |
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