S. H. Kettell
A5007156766- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Quantum Chromodynamics and Particle Interactions
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Superconducting Materials and Applications
- Nuclear Physics and Applications
- Quantum, superfluid, helium dynamics
- Muon and positron interactions and applications
- Computational Physics and Python Applications
- Advanced Semiconductor Detectors and Materials
- Black Holes and Theoretical Physics
- Gamma-ray bursts and supernovae
- Radioactive contamination and transfer
- Medical Imaging Techniques and Applications
- Photocathodes and Microchannel Plates
- Pulsars and Gravitational Waves Research
- Cold Atom Physics and Bose-Einstein Condensates
- Planetary Science and Exploration
Brookhaven National Laboratory
2015-2024
Brookhaven College
2012-2024
National Library of Luxembourg
2000-2002
Temple University
1990-1999
Campbell Collaboration
1997
Temple College
1996
The Daya Bay Reactor Neutrino Experiment has measured a nonzero value for the neutrino mixing angle ${\ensuremath{\theta}}_{13}$ with significance of 5.2 standard deviations. Antineutrinos from six 2.9 $\mathrm{G}{\mathrm{W}}_{\mathrm{th}}$ reactors were detected in antineutrino detectors deployed two near (flux-weighted baseline 470 m and 576 m) one far (1648 underground experimental halls. With $43\text{ }000\text{ }\text{ }\mathrm{ton}--\mathrm{G}{\mathrm{W}}_{\mathrm{th}}--\mathrm{day}$...
Experiment E949 at Brookhaven National Laboratory has observed three new events consistent with the decay K+→π+ν¯ν in pion momentum region 140<Pπ<199 MeV/c an exposure of 1.71×1012 stopped kaons estimated total background 0.93±0.17(stat)+0.32−0.24(syst) events. This brings number to seven. Combining this observation previous results, assuming spectrum predicted by standard model, results a branching ratio B(K+→π+ν¯ν)=(1.73+1.15−1.05)×10−10. An interpretation for alternative models...
A measurement of the energy dependence antineutrino disappearance at Daya Bay reactor neutrino experiment is reported. Electron antineutrinos (ν¯(e)) from six 2.9 GW(th) reactors were detected with detectors deployed in two near (effective baselines 512 and 561 m) one far (1579 underground experimental halls. Using 217 days data, 41 589 (203 809 92 912) candidates hall (near halls). An improved oscillation amplitude sin(2)2θ(13)=0.090(-0.009)(+0.008) first direct ν¯(e) mass-squared...
We report an improved measurement of the neutrino mixing angle $\theta_{13}$ from Daya Bay Reactor Neutrino Experiment. exclude a zero value for $\sin^22\theta_{13}$ with significance 7.7 standard deviations. Electron antineutrinos six reactors 2.9 GW$_{\rm th}$ were detected in antineutrino detectors deployed two near (flux-weighted baselines 470 m and 576 m) one far (1648 underground experimental halls. Using 139 days data, 28909 (205308) electron candidates at hall (near halls). The ratio...
This Letter reports a measurement of the flux and energy spectrum electron antineutrinos from six 2.9~GW$_{th}$ nuclear reactors with detectors deployed in two near (effective baselines 512~m 561~m) one far (1,579~m) underground experimental halls Daya Bay experiment. Using 217 days data, 296,721 41,589 inverse beta decay (IBD) candidates were detected halls, respectively. The measured IBD yield is (1.55 $\pm$ 0.04) $\times$ 10$^{-18}$~cm$^2$/GW/day or (5.92 0.14) 10$^{-43}$~cm$^2$/fission....
We report a new measurement of electron antineutrino disappearance using the fully constructed Daya Bay Reactor Neutrino Experiment. The final two eight detectors were installed in summer 2012. Including 404 days data collected from October 2012 to November 2013 resulted total exposure 6.9×10^{5} GW_{th} ton days, 3.6 times increase over our previous results. Improvements energy calibration limited variations between 0.2%. Removal six ^{241}Am-^{13}C radioactive sources reduced background by...
The Daya Bay Collaboration reports precise measurements of the ${\ensuremath{\theta}}_{13}$ neutrino mixing angle and predicts $\mathrm{\ensuremath{\Delta}}\phantom{\rule{0}{0ex}}{m}_{32}^{2}$ mass difference for both normal inverted hierarchy scenarios. These values are based on comparing detection antineutrinos by ''near'' ''far'' detectors more than 2.5 million inverse beta-decay observations.
The Daya Bay experiment has observed correlations between reactor core fuel evolution and changes in the antineutrino flux energy spectrum. Four detectors two experimental halls were used to identify 2.2 million inverse beta decays (IBDs) over 1230 days spanning multiple cycles for each of six 2.9 GW$_{\textrm{th}}$ cores at Ling Ao nuclear power plants. Using detector data effective $^{239}$Pu fission fractions, $F_{239}$, from 0.25 0.35, measures an average IBD yield, $\bar{\sigma}_f$,...
A new measurement of the reactor antineutrino flux and energy spectrum by Daya Bay neutrino experiment is reported. The antineutrinos were generated six 2.9~GW$_{\mathrm{th}}$ nuclear reactors detected eight detectors deployed in two near (560~m 600~m flux-weighted baselines) one far (1640~m baseline) underground experimental halls. With 621 days data, more than 1.2 million inverse beta decay (IBD) candidates detected. IBD yield was measured, ratio measured to predicted found be...
A search for light sterile neutrino mixing was performed with the first 217 days of data from Daya Bay Reactor Antineutrino Experiment. The experiment's unique configuration multiple baselines six 2.9~GW$_{\rm th}$ nuclear reactors to antineutrino detectors deployed in two near (effective 512~m and 561~m) one far (1579~m) underground experimental halls makes it possible test oscillations a fourth (sterile) $10^{\rm -3}~{\rm eV}^{2} < |\Delta m_{41}^{2}| 0.3~{\rm eV}^{2}$ range. relative...
Searches for electron antineutrino, muon neutrino, and antineutrino disappearance driven by sterile neutrino mixing have been carried out the Daya Bay MINOS+ collaborations. This Letter presents combined results of these searches, along with exclusion from Bugey-3 reactor experiment, framed in a minimally extended four-neutrino scenario. Significantly improved constraints on θ_{μe} angle are derived that constitute most constraining limits to date over five orders magnitude mass-squared...
In the present work of PIENU experiment, heavy neutrinos were sought in pion decays π+→μ+ν at rest by examining observed muon energy spectrum for extra peaks addition to expected peak a light neutrino. No evidence was observed. Upper limits set on neutrino mixing matrix |Uμi|2 mass region 15.7–33.8 MeV/c2, improving previous results an order magnitude.
Experiment E949 at Brookhaven National Laboratory studied the rare decay \$K^+\to\pi^+\nu\bar{\nu}$ and other processes with an exposure of $1.77\times 10^{12}$ $K^+$'s. The data were analyzed using a blind analysis technique yielding one candidate event estimated background $0.30\pm0.03$ events. Combining this result observation two events by predecessor experiment E787 gave branching ratio ${\calB}(K^+\to\pi^+\nu\bar{\nu})=(1.47^{+1.30}_{-0.89})\times 10^{-10}$, consistent Standard Model...
We report the results of a search for decay ${K}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}\ensuremath{\nu}\overline{\ensuremath{\nu}}$ in kinematic region with ${\ensuremath{\pi}}^{+}$ momentum $140<P<195\mathrm{MeV}/c$ using data collected by E787 experiment at BNL. No events were observed. When combined our previous this region, one candidate event an expected background $1.22\ifmmode\pm\else\textpm\fi{}0.24$ 90% C.L. upper limit...
The recent development of Water-based Liquid Scintillator (WbLS), and the concurrent high-efficiency high-precision-timing light sensors, has opened up possibility for a new kind large-scale detector capable very broad program physics. would include determination neutrino mass hierarchy observation CP violation with long-baseline neutrinos, searches proton decay, ultra-precise solar measurements, geo- supernova neutrinos including diffuse antineutrinos, neutrinoless double beta decay. We...
We have characterised Water-based Liquid Scintillator (WbLS) using low energy protons, UV-VIS absorbance, and fluorescence spectroscopy. also developed validated a simulation model that describes the behaviour of WbLS in our detector configurations for proton beam energies 2 GeV, 475 MeV, 210 MeV two compositions. Our results enabled us to estimate light yield ionisation quenching WbLS, as well understand influence wavelength shifting Cerenkov on measurements. These are relevant suitability...
Abstract The prediction of reactor antineutrino spectra will play a crucial role as experiments enter the precision era. positron energy spectrum 3.5 million inverse beta decay reactions observed by Daya Bay experiment, in combination with fission rates fissile isotopes reactor, is used to extract resulting from specific isotopes. This information can be produce precise, data-based other different fractions than Bay. are unfolded obtain removing contribution detector response Wiener-SVD...
Medium-baseline reactor neutrino oscillation experiments (MBRO) have been proposed to determine the mass hierarchy (MH) and make precise measurements of parameters. With sufficient statistics, better than ~3%/\sqrt{E} energy resolution well understood non-linearity, MH can be determined by analyzing signals driven atmospheric mass-squared difference in survival spectrum antineutrinos. such high performance MBRO detectors, parameters, as \sin^22θ_{12}, Δm^2_{21}, Δm^2_{32}, measured...