A5040480025- Atomic and Subatomic Physics Research
- Dark Matter and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Calibration and Measurement Techniques
- Cosmology and Gravitation Theories
- Radiation Dose and Imaging
- Radio Astronomy Observations and Technology
- Advanced X-ray and CT Imaging
- Radioactivity and Radon Measurements
- Quantum, superfluid, helium dynamics
- Atmospheric Ozone and Climate
- Particle Detector Development and Performance
- Superconducting and THz Device Technology
- Traumatic Ocular and Foreign Body Injuries
- Nuclear Physics and Applications
- Neutrino Physics Research
- Analytical Chemistry and Sensors
- Luminescence Properties of Advanced Materials
University of California, Davis
2016-2024
University College Hospital
1957
University College London
1957
We are building an experiment to search for dark matter in the form of photons nano- milli-eV mass range. This is electromagnetic dual magnetic detector radio experiments. It also a frequency-time two ways: high-Q signal wide-band data rather than tuning high-$Q$ resonator, and we measure electric fields. In this paper describe pilot using room temperature electronics which demonstrates feasibility sets useful limits kinetic coupling $\epsilon \sim 10^{-12}$ over 50--300 MHz. With factor...
Tetraphenyl-butadiene (TPB) is a wavelength shifting material that can absorb ultraviolet photons and emit blue photons. It used in the detection of vacuum (VUV) photons, for which typical photo-sensors, such as most photomultiplier tubes (PMT) silicon photomultipliers (SiPM), do not have any quantum efficiency. The secondary light emitted isotropically, however, due to scattering within material, its angular distribution upon exiting be easily predicted. Here we describe procedure...
We report new limits on the kinetic mixing strength of dark photon spanning mass range 0.21 -- 1.24 $\mu$eV corresponding to a frequency span 50 300 MHz. The Dark E-Field Radio experiment is wide-band search for matter. In this paper we detail changes in calibration and upgrades since our proof-of-concept pilot run. Our detector employs wide bandwidth E-field antenna moved multiple positions shielded room, low noise amplifier, wideband ADC, followed by $2^{24}$-point FFT. An optimal filter...
We report new limits on the kinetic mixing strength of dark photon spanning mass range <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mn>0.21</a:mn><a:mo>−</a:mo><a:mn>1.24</a:mn><a:mtext> </a:mtext><a:mtext> </a:mtext><a:mi mathvariant="normal">μ</a:mi><a:mi>eV</a:mi></a:mrow></a:math> corresponding to a frequency span 50–300 MHz. The Dark E-field Radio experiment is wideband search for matter. In this paper we detail changes in calibration and upgrades...
Silicon photomultipliers (SiPMs) are potential solid-state alternatives to traditional photomultiplier tubes (PMTs) for single-photon detection. In this paper, we report on evaluating SensL MicroFC-10035-SMT SiPMs their suitability as PMT replacements. The devices were successfully operated in a liquid-xenon detector, which demonstrates that can be used noble element time projection chambers photosensors. also cooled down 170 K observe dark count dependence temperature. No dependencies the...
There is a particular class of unavoidable backgrounds that plague low-background experiments and rare event searches, particularly those searching for nuclear recoil signatures: decaying daughters the 238U decay chain, which result from radon plate-out on detector materials. One such daughter isotope, 210Po, undergoes α-decay produces recoiling 103 keV 206Pb nucleus. To characterize this important background in context noble element detectors, we have implemented triggered source these...
Thorium-X (224Ra) is a naturally occurring radioactive element of the thorium series which decays by emission α rays with half-life 3·64 days. These physical properties contribute mainly to its wide use in dermatological departments for treating variety skin conditions. In past it was prepared chemical separation from ores. Members and other radionuclides could have been present, therefore, as contaminants 224Ra dispensed clinical use. Wyard, Nightingale Austin (1955) considered possible...