A5057736043- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Black Holes and Theoretical Physics
- Computational Physics and Python Applications
- Atomic and Subatomic Physics Research
- Particle Accelerators and Free-Electron Lasers
- Medical Imaging Techniques and Applications
- Astrophysics and Cosmic Phenomena
- Superconducting Materials and Applications
- Nuclear physics research studies
- Radiation Detection and Scintillator Technologies
- Stochastic processes and statistical mechanics
- Quantum, superfluid, helium dynamics
- Cosmology and Gravitation Theories
- Nuclear Physics and Applications
- Particle accelerators and beam dynamics
- Distributed and Parallel Computing Systems
- Pulsars and Gravitational Waves Research
- Markov Chains and Monte Carlo Methods
- International Science and Diplomacy
- Advanced NMR Techniques and Applications
Massachusetts Institute of Technology
2023-2025
Indiana University
2020-2025
Indiana University Bloomington
2018-2024
University of Zurich
2013-2024
Istituto Nazionale di Fisica Nucleare, Sezione di Bologna
2023-2024
Cochin University of Science and Technology
2023-2024
Banaras Hindu University
2023-2024
Charles University
2023-2024
California Institute of Technology
2023-2024
RWTH Aachen University
2018-2023
A cryogenic apparatus is described that enables a new experiment, nEDM@SNS, with major improvement in sensitivity compared to the existing limit search for neutron Electric Dipole Moment (EDM). This uses superfluid 4He produce high density of Ultra-Cold Neutrons (UCN) which are contained suitably coated pair measurement cells. The be operated at Spallation Neutron Source Oak Ridge National Laboratory, polarized 3He from an Atomic Beam injected into and transported cells where it serves as...
EXO-200 is a single phase liquid xenon detector designed to search for neutrinoless double-beta decay of $^{136}$Xe. Here we report on various Majoron-emitting modes based 100 kg$\cdot$yr exposure A lower limit $T^{^{136}Xe}_{1/2} >1.2 \cdot 10^{24}$ yr at 90% C.L. the half-life spectral index = 1 Majoron was obtained, corresponding constraint Majoron-neutrino coupling constant $|< g^{M}_{ee} >|<$ (0.8-1.7)$\cdot$10$^{-5}$.
Alpha decays in the EXO-200 detector are used to measure fraction of charged $^{218}\text{Po}$ and $^{214}\text{Bi}$ daughters created from $\ensuremath{\alpha}$ $\ensuremath{\beta}$ decays, respectively. $^{222}\text{Rn} \ensuremath{\alpha}$ liquid xenon (LXe) found produce $^{218}\text{Po}^{+}$ ions $50.3\ifmmode\pm\else\textpm\fi{}3.0%$ time, while remainder atoms neutral. The $^{214}\text{Bi}^{+}$ $^{214}\text{Pb} \ensuremath{\beta}$ LXe is be $76.4\ifmmode\pm\else\textpm\fi{}5.7%$,...
The EXO-200 Collaboration is searching for neutrinoless double $\ensuremath{\beta}$ decay using a liquid xenon (LXe) time projection chamber. This measurement relies on modeling the transport of charge deposits produced by interactions in LXe to allow discrimination between signal and background events. Here we present measurements transverse diffusion constant drift velocity electrons at fields 20 V/cm 615 data. At operating field 380 measures...
The search for neutrinoless double-beta decay (0νββ) requires extremely low background and a good understanding of their sources influence on the rate in region parameter space relevant to 0νββ signal. We report studies various β γ backgrounds liquid-xenon-based EXO-2000νββ experiment. With this work we try better understand location strength specific compare conclusions radioassay results taken before during detector construction. Finally, discuss implications these EXO-200 as well...
Progress on a method of barium tagging for the nEXO double beta decay experiment is reported. Absorption and emission spectra deposits atoms ions in solid xenon matrices are presented. Excitation prominent lines, temperature dependence, bleaching fluorescence reveal existence different matrix sites. A regular series sharp lines observed ${\mathrm{Ba}}^{+}$ identified with some type hydride molecule. Lower limits quantum efficiency principal Ba transition Under current conditions, an image...
As neutrinoless double-beta decay experiments become more sensitive and intrinsic radioactivity in detector materials is reduced, previously minor contributions to the background must be understood eliminated. With this mind, cosmogenic backgrounds have been studied with EXO-200 experiment. Using TPC, muon flux (through a flat horizontal surface) underground at Waste Isolation Pilot Plant (WIPP) has measured {\Phi} = 4.07 $\pm$ 0.14 (sys) 0.03 (stat) $\times$ $10^{-7}$cm$^{-2}$ s$^{-1}$,...
Neutron beta decay is one of the most fundamental processes in nuclear physics and provides sensitive means to uncover details weak interaction. can evaluate ratio axial-vector vector coupling constants standard model, λ = g A / V , through multiple correlations. The Nab experiment will carry out measurements electron-neutrino correlation parameter a with precision δ 10 −3 Fierz interference term b 3 × unpolarized free neutron decay. These results, along more precise measurement lifetime,...
We describe a system to transport and identify barium ions produced in liquid xenon, as part of R&D towards the second phase double beta decay experiment, nEXO. The goal is Ba ion resulting from an extremely rare nuclear isotope 136Xe, hence providing confirmation occurrence decay. This achieved through Resonance Ionization Spectroscopy (RIS). In test setup described here, can be xenon or vacuum collected on clean substrate. substrate then removed analysis chamber under vacuum, where...
The performance of the ring-imaging Cherenkov detectors at LHCb experiment is determined during LHC Run 2 period between 2015 and 2018. stability angle resolution number detected photons with time running conditions measured. particle identification evaluated data found to satisfy requirements physics programme.
Searches for double beta decay of $^{134}$Xe were performed with EXO-200, a single-phase liquid xenon detector designed to search neutrinoless $^{136}$Xe. Using an exposure $29.6\text{ kg}\!\cdot\!\text{yr}$, the lower limits $\text{T}_{1/2}^{2\nu\beta\!\beta}>8.7\cdot10^{20}\text{ yr}$ and $\text{T}_{1/2}^{0\nu\beta\!\beta}>1.1\cdot10^{23}\text{ at 90% confidence level derived, corresponding half-life sensitivities $1.2\cdot10^{21}\text{ $1.9\cdot10^{23}\text{ yr}$. These exceed those in...
EXO-200 is a single phase liquid xenon detector designed to search for neutrinoless double-beta decay of $^{136}$Xe the ground state $^{136}$Ba. We report here on two-neutrino first $0^+$ excited state, $0^+_1$, $^{136}$Ba based 100 kg$\cdot$yr exposure $^{136}$Xe. Using specialized analysis employing machine learning algorithm, we obtain 90% CL half-life sensitivity $1.7 \times 10^{24}$ yr. find no statistically significant evidence $2\nu\beta\beta$ resulting in lower limit $T^{2\nu}_{1/2}$...
The Axion Resonant Interaction Detection Experiment (ARIADNE) is a nuclear-magnetic-resonance-based experiment that will search for novel axion-induced spin-dependent interactions between an unpolarized source mass rotor and spin-polarized $^{3}\mathrm{He}$ nuclei placed nearby. To detect feeble axion-mediated signal at the subattotesla level, relies on ultralow magnetic background noise. We measure characterize field from prototype tungsten rotor. show dominantly caused by few discrete...
The energy resolution of the EXO-200 detector is limited by electronics noise in measurement scintillation response. Here we present a new technique to extract optimal measurements for signals split across multiple channels presence correlated noise. implementation these techniques improves at neutrinoless double beta decay Q-value from [1.9641 ± 0.0039]% [1.5820 0.0044]%.
We report on a measurement of the flavor-specific $B^0_s$ lifetime and $D^-_s$ using proton-proton collisions at center-of-mass energies 7 8 TeV, collected by LHCb experiment corresponding to 3.0 $fb^{−1}$ integrated luminosity. Approximately 407 000 $B^0_s \to D^{(*)-}_s \mu^+\nu_{\mu}$ decays are partially reconstructed in $K^+ K^- \pi^- \mu^+$ final state. The natural widths determined using, as reference, kinematically similar same resulting differences between $B^0$ mesons $D^-$...
Cornell University is in the process of building a 10 m long superconducting accelerator module as prototype main linac proposed ERL facility. This houses 6 cavities- operated at 1.8 K continuous wave (CW) mode - with individual HOM absorbers and one magnet/BPM section. In pushing limits, high quality factor cavities (2•1010) beam currents (100 mA accelerated plus 100 decelerated) were targeted. We will review design shortly present results components tested before assembly. includes data...