M. Bressler
A5053644168- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- Radiation Therapy and Dosimetry
- Radiation Detection and Scintillator Technologies
- Particle Detector Development and Performance
- Superconducting Materials and Applications
- Astrophysics and Cosmic Phenomena
- Neutrino Physics Research
- Photocathodes and Microchannel Plates
- Particle accelerators and beam dynamics
- Cosmology and Gravitation Theories
- High-Energy Particle Collisions Research
- Geomagnetism and Paleomagnetism Studies
- Cold Atom Physics and Bose-Einstein Condensates
- Computational Physics and Python Applications
- Quantum, superfluid, helium dynamics
- Magnetic Field Sensors Techniques
- CCD and CMOS Imaging Sensors
- Physics of Superconductivity and Magnetism
Drexel University
2019-2025
Amherst College
2023-2024
University of Massachusetts Amherst
2023
Messiah College
2017
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,...
We present a new measurement of the positive muon magnetic anomaly, a_{μ}≡(g_{μ}-2)/2, from Fermilab Muon g-2 Experiment using data collected in 2019 and 2020. have analyzed more than 4 times number positrons decay our previous result 2018 data. The systematic error is reduced by factor 2 due to better running conditions, stable beam, improved knowledge field weighted distribution, ω[over ˜]_{p}^{'}, anomalous precession frequency corrected for beam dynamics effects, ω_{a}. From ratio...
We present details on a new measurement of the muon magnetic anomaly, $a_\mu = (g_\mu -2)/2$. The result is based positive data taken at Fermilab's Muon Campus during 2019 and 2020 accelerator runs. uses $3.1$ GeV$/c$ polarized muons stored in $7.1$-m-radius storage ring with $1.45$ T uniform field. value $ a_{\mu}$ determined from measured difference between spin precession frequency its cyclotron frequency. This normalized to strength field, using Nuclear Magnetic Resonance (NMR). ratio...
The physics reach of a low threshold (100 eV) scintillating argon bubble chamber sensitive to Coherent Elastic neutrino-Nucleus Scattering (CE$\nu$NS) from reactor neutrinos is studied. sensitivity the weak mixing angle, neutrino magnetic moment, and light $Z'$ gauge boson mediator are analyzed. A Monte Carlo simulation backgrounds performed assess their contribution signal. analysis shows that world-leading sensitivities achieved with one-year exposure for 10 kg at 3 m 1 MW$_{th}$ research...
We present a new measurement of the positive muon magnetic anomaly, $a_\mu \equiv (g_\mu - 2)/2$, from Fermilab Muon $g\!-\!2$ Experiment using data collected in 2019 and 2020. have analyzed more than 4 times number positrons decay our previous result 2018 data. The systematic error is reduced by factor 2 due to better running conditions, stable beam, improved knowledge field weighted distribution, $\tilde{\omega}'^{}_p$, anomalous precession frequency corrected for beam dynamics effects,...
The Scintillating Bubble Chamber (SBC) collaboration is developing liquid-noble bubble chambers for the detection of sub-keV nuclear recoils. These detectors benefit from electron recoil rejection inherent in moderately-superheated with addition energy reconstruction provided scintillation signal. ability to measure low-energy recoils allows search GeV-scale dark matter and measurement coherent elastic neutrino-nucleus scattering on argon MeV-scale reactor antineutrinos. first physics-scale...
The primary advantage of moderately superheated bubble chamber detectors is their simultaneous sensitivity to nuclear recoils from weakly interacting massive particle (WIMP) dark matter and insensitivity electron recoil backgrounds. A comprehensive analysis PICO gamma calibration data demonstrates for the first time that in ${\mathrm{C}}_{3}{\mathrm{F}}_{8}$ scale accordance with a new nucleation mechanism, rather than one driven by hot spike as previously supposed. Using this semiempirical...
In this paper, we report on the successful operation at Drexel University of PICO collaboration's first C$_3$F$_8$ buffer-free prototype fluorocarbon bubble chamber. Previous chambers have produced world-leading WIMP search results with target fluids, separated from steel bellows by a buffer layer water. Surface tension effects jar walls and liquid-liquid interface lead to class background events which nuclear-recoil-like acoustic signatures thus contaminate WIMP-like signal region in...
Many compelling models predict dark matter coupling to the electromagnetic current through higher multipole interactions, while remaining electrically neutral. Different couplings have been studied, among them anapole moment, electric and magnetic dipole moments, millicharge. This study sets limits on for these photon-mediated interactions using nonrelativistic contact operators in an effective field theory framework. Using data from PICO-60 bubble chamber leading masses between 2.7...
PICO bubble chambers have exceptional sensitivity to inelastic dark matter-nucleus interactions due a combination of their extended nuclear-recoil energy detection window from few keV $O(100\text{ }\text{ }\mathrm{keV})$ or more and the use iodine as heavy target. Inelastic scattering is interesting for studying properties matter, where many theoretical scenarios been developed. This study reports results search matter with PICO-60 chambers. The analysis reported here comprises physics runs...
The bubble nucleation efficiency of low-energy nuclear recoils in superheated liquids plays a crucial role interpreting results from direct searches for weakly interacting massive particle (WIMP) dark matter. PICO collaboration presents the efficiencies carbon and fluorine ${\mathrm{C}}_{3}{\mathrm{F}}_{8}$ calibration data taken with five distinct neutron spectra at various thermodynamic thresholds ranging 2.1 to 3.9 keV. Instead assuming any particular functional forms recoil efficiency,...
The Scintillating Bubble Chamber (SBC) Collaboration is developing liquid-noble bubble chambers for the quasi-background-free detection of low-mass (GeV-scale) dark matter and coherent scattering low-energy (MeV-scale) neutrinos (CE$\nu$NS). first physics-scale demonstrator this technique, a 10-kg liquid argon chamber dubbed SBC-LAr10, now being commissioned at Fermilab. This device will calibrate background discrimination power sensitivity superheated to nuclear recoils energies down 100...
The Scintillating Bubble Chamber (SBC) collaboration purchased 32 Hamamatsu VUV4 silicon photomultipliers (SiPMs) for use in SBC-LAr10, a bubble chamber containing 10~kg of liquid argon. A dark-count characterization technique, which avoids the single-photon source, was used at two temperatures to measure SiPMs breakdown voltage ($V_{\text{BD}}$), SiPM gain ($g_{\text{SiPM}}$), rate change $g_{\text{SiPM}}$ with respect ($m$), dark count (DCR), and probability correlated avalanche...
A device filled with pure xenon first demonstrated the ability to operate simultaneously as a bubble chamber and scintillation detector in 2017. Initial results from data taken at thermodynamic thresholds down ~4 keV showed sensitivity ~20 nuclear recoils no observable nucleation by $\gamma$-ray interactions. This paper presents further operation of same low 0.50 keV, hardware limited. The has now been shown have ~1 while remaining insensitive $\gamma$-rays. robust calibration chamber's...
Abstract Understanding and quantifying the gamma-induced bubble nucleation background in clean nuclear recoil detection chambers is of utmost importance to chamber based dark matter searches. We present data confirming hypothesis that large Auger cascades from high-Z elements such as iodine xenon dramatically increase response C 3 F 8 gamma rays. These tests, performed with a small calibration filled +𝒪(10) ppm xenon, show probability scales rate inner-shell vacancies, reaching values...
PICO bubble chambers have exceptional sensitivity to inelastic dark matter-nucleus interactions due a combination of their extended nuclear recoil energy detection window from few keV $O$(100 keV) or more and the use iodine as heavy target. Inelastic scattering is interesting for studying properties matter, where many theoretical scenarios been developed. This study reports results search matter with PICO-60 chambers. The analysis reported here comprises physics runs using CF$_{3}$I...
Cosmic ray muons are produced when high energy particles interact with nuclei in Earth's atmosphere. Muons make up the majority of charged that reach sea level and only (apart from neutrinos) can penetrate to significant depths underground. The muon flux underground decreases approximately exponentially as a function depth. We use cosmic detector developed by QuarkNet Program at Fermi National Laboratory map topography mountain above an abandoned Pennsylvania Turnpike tunnel analyzing...