C. J. Chen
A5009848081- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- Radiation Therapy and Dosimetry
- Particle Detector Development and Performance
Northwestern University
2017-2019
Final results are reported from operation of the PICO-60 C$_3$F$_8$ dark matter detector, a bubble chamber filled with 52 kg located in SNOLAB underground laboratory. The was operated at thermodynamic thresholds as low 1.2 keV without loss stability. A new blind 1404-kg-day exposure 2.45 threshold acquired approximately same expected total background rate previous 1167-kg-day 3.3 keV. This increased is enabled part by optical tracking analysis to better identify events near detector walls,...
A 30-g xenon bubble chamber, operated at Northwestern University in June and November 2016, has for the first time observed simultaneous nucleation scintillation by nuclear recoils a superheated liquid. This chamber is instrumented with CCD camera near-IR imaging, solar-blind photomultiplier tube to detect 175-nm light, piezoelectric acoustic transducer ultrasonic emission from growing bubble. The of determined signal used correlate specific pulses bubble-nucleating events. We report on data...