A5054900080- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Nuclear Physics and Applications
- Scientific Research and Discoveries
Fermi National Accelerator Laboratory
2019-2023
University of Chicago
2019-2023
Donostia International Physics Center
2023
The European Spallation Source (ESS), presently well on its way to completion, will soon provide the most intense neutron beams for multi-disciplinary science. Fortuitously, it also generate largest pulsed neutrino flux suitable detection of Coherent Elastic Neutrino-Nucleus Scattering (CE$\nu$NS), a process recently measured first time at ORNL's Neutron Source. We describe innovative detector technologies maximally able profit from order-of-magnitude increase in provided by ESS, along with...
The 96.4 day exposure of a 3 kg ultralow noise germanium detector to the high flux antineutrinos from power nuclear reactor is described. A very strong preference (p<1.2×10^{-3}) for presence coherent elastic neutrino-nucleus scattering (CEνNS) component in data found, when compared background-only model. No such effect visible 25 days operation during outages. best-fit CEνNS signal good agreement with expectations based on recent characterization response sub-keV recoils. Deviations order...
To properly interpret scintillation data produced by nuclear recoils (NR), one requires knowledge of so-called quenching factors that relate the observed energy to electron same kinetic energy. An accurate understanding QFs is essential make sense data. In present paper, authors report on an ambitious and painstaking experimental determination for germanium, a material widely used in dark matter neutrino experiments. The study finds significant deviations from predictions most popular...
A new measurement of the quenching factor for low-energy nuclear recoils in CsI[Na] is presented. Past measurements are revisited, identifying and correcting several systematic effects. The resulting global data well-described by a physics-based model generation scintillation ions this material, agreement with phenomenological considerations. uncertainty reduced four respect to an energy-independent initially adopted as compromise COHERENT collaboration. significantly improved Standard Model...
The deployment of a low-noise 3 kg p-type point contact germanium detector at the Dresden-II power reactor, 8 meters from its 2.96 GW$_{th}$ core, is described. This location provides an unprecedented (anti)neutrino flux 8.1$\times 10^{13} ~\bar{\nu_{e}}/$cm$^{2}$s. When combined with 0.2 keV$_{ee}$ threshold achieved, first measurement CE$\nu$NS reactor source appears to be within reach. We report on characterization and abatement backgrounds during initial runs, deriving improved limits...
The bright scintillation of pure CsI operated at liquid-nitrogen temperature makes this material a promising dark matter and neutrino detector. We present the first measurement its quenching factor for nuclear recoils. Our findings indicate it is indistinguishable from that sodium-doped room temperature. Additional properties such as light yield, afterglow, decay electron recoils, energy proportionality are studied over \mbox{108-165 K} range, confirming vast potential medium rare-event searches.
We describe several omissions and deficiencies in the arguments presented by Ackermann et al. (arXiv:2401.07684), pointing at missing information necessary to back up its conclusions.
Coherent elastic neutrino-nucleus scattering (CE$\nu$NS) and other rare-event physics searches, like dark matter detection, have been especially furthered by increasing sensitivity to low-energy particle interactions. Experiments using multiple detector technologies sought CE$\nu$NS at the most intense terrestrial sources of neutrinos: spallation facilities nuclear reactors. This thesis reports on feasibility cryogenic pure CsI as an improved next-generation target up-and-coming European...
We demonstrate the feasibility of probing charged lepton flavor violating decay $\mu^{+}\!\!\rightarrow \!e^{+} X^{0}$ for presence a slow-moving neutral boson $X^{0}$ capable undergoing gravitational binding to large structures, and as such able participate in some cosmological scenarios. A short exposure surface antimuons from beamline M20 at TRIUMF generates branching ratio limit $\lesssim 10^{-5}$. This is comparable or better than previous searches this channel, although thus-far...