D. Z. Osterman
A5108852991- Atomic and Subatomic Physics Research
- Dark Matter and Cosmic Phenomena
- Superconducting and THz Device Technology
- Radiation Therapy and Dosimetry
- Particle physics theoretical and experimental studies
- Advanced Thermodynamics and Statistical Mechanics
- Quantum and electron transport phenomena
- Nuclear Physics and Applications
- Quantum, superfluid, helium dynamics
- Cold Atom Physics and Bose-Einstein Condensates
University of Massachusetts Amherst
2024-2025
The SPICE/HeRALD collaboration is performing research and development to enable studies of sub-GeV dark matter models using a variety target materials. Here we report our recent progress on instrumenting superfluid He4 mass with transition-edge sensor based calorimeter detect both atomic signals (scintillation) quasiparticle (phonon roton) excitations. sensitivity HeRALD the critical "quantum evaporation" signal from quasiparticles requires us block film flow calorimeter. We have developed...
We describe observations of low energy excess (LEE) events, background events observed in all light dark matter direct detection calorimeters, and noise a transition edge sensor based two-channel silicon athermal phonon detector with 375 meV baseline resolution. measure two distinct LEE populations: “shared” multichannel pulse shape consistent substrate sub-eV that couple nearly exclusively to single channel significantly faster shape. These “singles” are occurring within the aluminum...
We describe design studies for a pulsed quasi-monoenergetic 2-keV neutron source calibration of sub-keV nuclear recoils. Such is required detectors sensitive to sub-GeV dark matter and also the coherent elastic scattering reactor neutrinos. In our design, neutrons from commercial deuterium-tritium generator are moderated keV scale then filtered monoenergetic spectrum using feature in cross section scandium. this approach, unmoderated high-energy form challenging background, along with gammas...
We describe observations of low energy excess (LEE) events (background observed in all light dark matter direct detection calorimeters) and noise a two-channel silicon athermal phonon detector with 375 meV baseline resolution. measure two distinct LEE populations: ``shared'' multichannel pulse shape consistent events, sub-eV which couple nearly exclusively to single channel significantly faster shape. These ``singles'' are occurring within the aluminum collection fins. Similarly, our...
The SPICE/HeRALD collaboration is performing R&D to enable studies of sub-GeV dark matter models using a variety target materials. Here we report our recent progress on instrumenting superfluid $^4$He mass with transition-edge sensor based calorimeter detect both atomic signals (e.g. scintillation) and quasiparticle (phonon roton) excitations. sensitivity HeRALD the critical "quantum evaporation" signal from quasiparticles requires us block film flow calorimeter. We have developed...