J. A. Formaggio
A5012437197- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Particle Detector Development and Performance
- Particle accelerators and beam dynamics
- Atomic and Subatomic Physics Research
- High-Energy Particle Collisions Research
- Nuclear Physics and Applications
- Quantum Chromodynamics and Particle Interactions
- Muon and positron interactions and applications
- Radiation Detection and Scintillator Technologies
- Graphite, nuclear technology, radiation studies
- Quantum Mechanics and Applications
- Nuclear physics research studies
- Superconducting Materials and Applications
- Quantum Information and Cryptography
- Particle Accelerators and Free-Electron Lasers
- Computational Physics and Python Applications
- Quantum, superfluid, helium dynamics
- Quantum Computing Algorithms and Architecture
- Scientific Research and Discoveries
- Atomic and Molecular Physics
- Superconducting and THz Device Technology
- Electron and X-Ray Spectroscopy Techniques
Massachusetts Institute of Technology
2015-2024
University of Washington
2009-2024
Johannes Gutenberg University Mainz
2024
Joint Institute for Nuclear Astrophysics
2019
Seattle University
2007-2014
University of California, Santa Barbara
2009
Columbia University
1998-2006
University of Rochester
2004
Queen's University
2003
Kansas State University
2000-2001
Observations of neutral-current nu interactions on deuterium in the Sudbury Neutrino Observatory are reported. Using neutral current (NC), elastic scattering, and charged reactions assuming standard 8B shape, nu(e) component solar flux is phis(e) = 1.76(+0.05)(-0.05)(stat)(+0.09)(-0.09)(syst) x 10(6) cm(-2) s(-1) for a kinetic energy threshold 5 MeV. The non-nu(e) phi(mu)(tau) 3.41(+0.45)(-0.45)(stat)(+0.48)(-0.45)(syst) s(-1), 5.3sigma greater than zero, providing strong evidence flavor...
The Sudbury Neutrino Observatory (SNO) has measured day and night solar neutrino energy spectra rates. For charged current events, assuming an undistorted 8B spectrum, the minus rate is 14.0%+/-6.3%(+1.5%)(-1.4%) of average rate. If total flux active neutrinos additionally constrained to have no asymmetry, nu(e) asymmetry found be 7.0%+/-4.9%(+1.3%)(-1.2%). A global analysis in terms matter-enhanced oscillations two flavors strongly favors large mixing angle solution.
The Sudbury Neutrino Observatory has precisely determined the total active (nu(x)) 8B solar neutrino flux without assumptions about energy dependence of nu(e) survival probability. measurements were made with dissolved NaCl in heavy water to enhance sensitivity and signature for neutral-current interactions. is found be 5.21 +/- 0.27(stat)+/-0.38(syst) x 10(6) cm(-2) s(-1), agreement previous standard models. A global analysis these other reactor results yields Deltam(2)=7.1(+1.2)(-0.6)...
The NuTeV Collaboration has extracted the electroweak parameter sin(2)theta(W) from measurement of ratios neutral current to charged nu and (-)nu cross sections. Our value, sin(2)theta((on-shell))(W) = 0.2277 +/- 0.0013(stat) 0.0009(syst), is 3 standard deviations above model prediction. We also present a independent analysis same data in terms neutral-current quark couplings.
This white paper addresses the hypothesis of light sterile neutrinos based on recent anomalies observed in neutrino experiments and latest astrophysical data.
Since its original postulation by Wolfgang Pauli in 1930, the neutrino has played a prominent role our understanding of nuclear and particle physics. In intervening 80 years, scientists have detected measured neutrinos from variety sources, both man-made natural. Underlying all these observations, any inferences we may made them, is an how interact with matter. Knowledge interaction cross sections important necessary ingredient measurement. With advent new precision experiments, demands on...
Results are reported from the complete salt phase of Sudbury Neutrino Observatory experiment in which NaCl was dissolved D$_2$O target. The addition enhanced signal neutron capture, as compared to pure detector. By making a statistical separation charged-current events other types based on event-isotropy criteria, effective electron recoil energy spectrum has been extracted. In units $ 10^6$ cm$^{-2}$ s$^{-1}$, total flux active-flavor neutrinos $^8$B decay Sun is found be...
We report on the neutrino mass measurement result from first four-week science run of Karlsruhe Tritium Neutrino experiment KATRIN in spring 2019. Beta-decay electrons a high-purity gaseous molecular tritium source are energy analyzed by high-resolution MAC-E filter. A fit integrated electron spectrum over narrow interval around kinematic endpoint at 18.57 keV gives an effective square value $(-1.0^{+0.9}_{-1.1})$ eV$^2$. From this we derive upper limit 1.1 eV (90$\%$ confidence level)...
We report results from a combined analysis of solar neutrino data all phases the Sudbury Neutrino Observatory (SNO). By exploiting particle identification information obtained proportional counters installed during third phase, this improved background rejection in that phase experiment. The SNO resulted total flux active flavors ${}^{8}\mathrm{B}$ decays Sun...
The Sudbury Neutrino Observatory (SNO) used an array of 3He proportional counters to measure the rate neutral-current interactions in heavy water and precisely determined total active (nu_x) 8B solar neutrino flux. This technique is independent previous methods employed by SNO. flux found be 5.54_-0.31;+0.33(stat)-0.34+0.36(syst)x10(6) cm(-2) s(-1), agreement with measurements standard models. A global analysis reactor results yields Deltam2=7.59_-0.21;+0.19x10(-5) eV2 theta=34.4_-1.2;+1.3...
The axion is a promising dark matter candidate, which was originally proposed to solve the strong-CP problem in particle physics. To date, available parameter space for and axionlike relatively unexplored, particularly at masses m_{a}≲1 μeV. ABRACADABRA new experimental program search over broad range of masses, 10^{-12}≲m_{a}≲10^{-6} eV. ABRACADABRA-10 cm small-scale prototype future detector that could be sensitive QCD axion. In this Letter, we present first results from 1 month axions...
Many low-threshold experiments observe sharply rising event rates of yet unknown origins below a few hundred eV, and larger than expected from known backgrounds. Due to the significant impact this excess on dark matter or neutrino sensitivity these experiments, collective effort has been started share knowledge about individual observations. For this, EXCESS Workshop was initiated. In its first iteration in June 2021, ten rare search collaborations contributed initiative via talks...
Results are reported from a joint analysis of Phase I and II data the Sudbury Neutrino Observatory. The effective electron kinetic energy threshold used is ${T}_{\mathrm{eff}}=3.5$ MeV, lowest yet achieved with water Cherenkov detector data. In units ${10}^{6}$ cm${}^{\ensuremath{-}2}$ ${\mathrm{s}}^{\ensuremath{-}1}$, total flux active-flavor neutrinos $^{8}\mathrm{B}$ decay in Sun measured using neutral current (NC) reaction on deuterons, no constraint neutrino spectrum, found to be...
We present measurements of the semi-inclusive cross sections for νμ- and ν¯μ-nucleon deep inelastic scattering interactions with two oppositely charged muons in final state. These events dominantly arise from production a charm quark during process. The measurement was obtained analysis 5102 νμ-induced 1458 ν¯μ-induced collected NuTeV detector exposed to sign-selected beam at Fermilab Tevatron. also extract cross-section reanalysis 5030 1060 exposure same quad-triplet by Chicago Columbia...
The NuTeV experiment at Fermilab has obtained a unique high-statistics sample of neutrino and antineutrino interactions using its high-energy sign-selected beam. We present measurement the differential cross section for charged-current scattering from iron. determine relative ν¯ to ν section, r=σν¯/σν, high energy with errors factor 2 smaller than previous world average. Structure functions, F2(x,Q2) xF3(x,Q2), are determined by fitting inelasticity, y, dependence sections. This...
The Leggett-Garg inequality, an analogue of Bell's inequality involving correlations measurements on a system at different times, stands as one the hallmark tests quantum mechanics against classical predictions. phenomenon neutrino oscillations should adhere to quantum-mechanical predictions and provide observable violation inequality. We demonstrate how oscillation phenomena can be used test for violations bound by performing ensemble neutrinos distinct energies, opposed single times. A...
The most sensitive direct method to establish the absolute neutrino mass is observation of endpoint tritium beta-decay spectrum. Cyclotron radiation emission spectroscopy (CRES) a precision spectrographic technique that can probe much unexplored range with resolution. A lower bound set by observations oscillations, while KATRIN experiment—the current-generation experiment based on magnetic adiabatic collimation an electrostatic (MAC-E) filter—will achieve sensitivity . CRES aims avoid...
We present the potential sensitivity of a future recoil detector for first detection process coherent elastic neutrino nucleus scattering (CEνNS). use Chooz reactor complex in France as our luminous source neutrinos. Leveraging ability to cleanly separate rate correlated with thermal power against (uncorrelated) backgrounds, we show that 10 kg cryogenic bolometric array 100 eV threshold should be able extract CEνNS signal within one year running.
It has been understood since 1897 that accelerating charges must emit electromagnetic radiation. Although first derived in 1904, cyclotron radiation from a single electron orbiting magnetic field never observed directly. We demonstrate single-electron detection novel radio-frequency spectrometer. The relativistic shift the frequency permits precise energy measurement. Precise beta spectroscopy gaseous sources is key technique modern efforts to measure neutrino mass via tritium decay end...
The absolute scale of the neutrino mass plays a critical role in physics at every scale, from subatomic to cosmological. Measurements tritium end-point spectrum have provided most precise direct limit on scale. In this Letter, we present advances by Project 8 cyclotron radiation emission spectroscopy (CRES) technique culminating first frequency-based limit. With only cm^{3}-scale physical detection volume, m_{β}<155 eV/c^{2} (152 eV/c^{2}) is extracted background-free measurement continuous...
A search for neutral heavy leptons (NHLs) has been performed using an instrumented decay channel at the NuTeV (E-815) experiment Fermilab. The data were examined NHLs decaying into muonic final states ( $\ensuremath{\mu}\ensuremath{\mu}\ensuremath{\nu}$, $\ensuremath{\mu}e\ensuremath{\nu}$, $\ensuremath{\mu}\ensuremath{\pi}$, and $\ensuremath{\mu}\ensuremath{\rho}$); no evidence found in 0.25--2.0 GeV mass range. This analysis places limits on mixing of with standard light neutrinos a level...
This article provides the complete description of results from Phase I data set Sudbury Neutrino Observatory (SNO). The is based on a 0.65 kiloton-year exposure ${}^{2}{\mathrm{H}}_{2}$O (in following denoted as ${\mathrm{D}}_{2}$O) to solar $^{8}\mathrm{B}$ neutrino flux. Included here are details SNO physics and detector model, evaluations systematic uncertainties, estimates backgrounds. Also discussed SNO's approach statistical extraction signals three reactions (charged current, neutral...