A5028580415- Nuclear Physics and Applications
- Nuclear physics research studies
- Atomic and Subatomic Physics Research
- Nuclear reactor physics and engineering
- Advanced NMR Techniques and Applications
- Quantum, superfluid, helium dynamics
- X-ray Spectroscopy and Fluorescence Analysis
- Atomic and Molecular Physics
- Neutrino Physics Research
- Laser Design and Applications
- Quantum Chromodynamics and Particle Interactions
- Nuclear and radioactivity studies
- Graphite, nuclear technology, radiation studies
- Crystallography and Radiation Phenomena
- Particle physics theoretical and experimental studies
- Advanced Chemical Physics Studies
- Astrophysics and Cosmic Phenomena
- Superconducting Materials and Applications
- Quantum chaos and dynamical systems
- Radiation Detection and Scintillator Technologies
- Spectroscopy and Laser Applications
- Advanced Battery Technologies Research
- Particle accelerators and beam dynamics
- Radiation Therapy and Dosimetry
- Advanced DC-DC Converters
North Carolina State University
2004-2024
Triangle Universities Nuclear Laboratory
1999-2019
University of Sheffield
2004-2016
University of North Carolina at Chapel Hill
2004-2005
Duke University
1982-2005
Joint Institute for Nuclear Research
2005
Kuwait University
2005
North Central State College
2002
Tohoku University
2002
Oak Ridge National Laboratory
1996-2000
KamLAND has measured the flux of nu;(e)'s from distant nuclear reactors. We find fewer nu;(e) events than expected standard assumptions about propagation at 99.95% C.L. In a 162 ton.yr exposure ratio observed inverse beta-decay to number without disappearance is 0.611+/-0.085(stat)+/-0.041(syst) for energies >3.4 MeV. context two-flavor neutrino oscillations with CPT invariance, all solutions solar problem except "large mixing angle" region are excluded.
We present results of a study neutrino oscillation based on 766 ton-year exposure KamLAND to reactor anti-neutrinos. observe 258 \nuebar\ candidate events with energies above 3.4 MeV compared 365.2 expected in the absence oscillation. Accounting for 17.8 background events, statistical significance \nuebar disappearance is 99.998%. The observed energy spectrum disagrees spectral shape at 99.6% and prefers distortion from effects. A two-neutrino analysis data gives \DeltaMSq =...
We review and analyze the available information on nuclear-fusion cross sections that are most important for solar energy generation neutrino production. provide best values low-energy cross-section factors and, wherever possible, estimates of uncertainties. also describe experiments calculations required in order to improve our knowledge fusion rates.DOI:https://doi.org/10.1103/RevModPhys.70.1265©1998 American Physical Society
This paper describes a novel adaptive battery model based on remapped variant of the well-known Randles' lead-acid model. Remapping is shown to allow improved modeling capabilities and accurate estimates dynamic circuit parameters when used with subspace parameter-estimation techniques. The performance proposed methodology demonstrated by application batteries for an all-electric personal rapid transit vehicle from urban light transport (ULTRA) program, which designated use at Heathrow...
A class of lasers which operates by cyclic excitation and relaxation in atomic vapor discharges is discussed. The required energy level structure for maximum efficiency described. Pulsed laser action neutral copper at 5105.54Å (58 dB/m, 2 kW peak power) 5782.13Å (42 0.6 provides experimental verification promises high efficiency. was also observed ionized calcium 8542.09Å 8662.14Å. Both have saturated gains 58 dB/m a total power output above 30 W.
A continuously operating 7.18-μ laser oscillator has been built using optically pumped cesium vapor as the amplifying medium. power of 50 μw is coupled out confocal resonator by means a 45° BaF2 pickoff window. The measured intensity distribution in good agreement with that derived from Boyd-Gordon expression for lowest-order mode.
Data corresponding to a KamLAND detector exposure of 0.28 kton yr has been used search for nu;(e)'s in the energy range 8.3<E(nu;(e))<14.8 MeV. No candidates were found an expected background 1.1+/-0.4 events. This result can be obtain limit on nu;(e) fluxes any origin. Assuming that all flux its origin Sun and characteristic 8B solar nu(e) spectrum, we upper 3.7 x 10(2) cm(-2) s(-1) (90% C.L.) flux. We interpret this limit, 2.8 10(-4) standard model flux, framework spin-flavor precession...
The neutron multiplicity was measured in coincidence with both binary products of the strongly damped collisions $^{86}\mathrm{Kr}$ on $^{166}\mathrm{Kr}$ at 602-MeV beam energy. ratio multiplicities for light and heavy fragments is good agreement corresponding mass all divisions. observed as well velocity angular distributions neutrons are consistent statistical-model calculations assuming isotropic evaporation from fully accelerated, unpolarized fragments.
Received 11 September 1961DOI:https://doi.org/10.1103/PhysRevLett.7.415©1961 American Physical Society
Parity-nonconserving longitudinal analyzing powers were measured for 23 p-wave neutron resonances in $^{232}\mathrm{Th}$. Seven show effects of greater than 2\ensuremath{\sigma} statistical significance (95% confidence)---the largest sample yet a single nucleus. All seven have positive sign. Strong sign correlations are not feature the conventional model parity mixing between compound nuclear states. The results suggest that mechanism violation resonance reactions is more complicated...
Parity nonconservation was studied for seventeen states in $^{239}\mathrm{U}$ by measuring the helicity dependence of total cross section epithermal neutrons scattered from $^{238}\mathrm{U}$. The root-mean-squared parity-violating matrix element mixing p-wave and s-wave determined to be M=0.${58}_{\mathrm{\ensuremath{-}}0.25}^{+0.50}$ meV. This corresponds a spreading width ${\mathrm{\ensuremath{\Gamma}}}^{\mathrm{PV}}$=1.0\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}7}$...
A new AC equivalent circuit for the CLL voltage-output resonant converter is presented, that offers improved accuracy compared with traditional FMA-based techniques. By employing describing function techniques, nonlinear interaction of parallel inductor, rectifier and load replaced by a complex impedance, thereby facilitating use analysis methodologies. Moreover, both continuous discontinuous rectifier-current operating conditions are addressed. generic normalized also presented. To further...
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...
We reanalyze Oklo $^{149}\mathrm{Sm}$ data using realistic models of the natural nuclear reactors. Disagreements among recent determinations time evolution \ensuremath{\alpha}, electromagnetic fine structure constant, are shown to be due different reactor models, which led neutron spectra used in calculations. use known epithermal spectral indices as criteria for selecting models. Two reactors, RZ2 and RZ10, were modeled with MCNP. The resulting calculate change effective capture cross...
A fast-neutron time-of-flight spectrometer has been constructed for the purpose of measuring neutron differential cross sections interest to controlled thermonuclear reactor (CTR) program. The experimental facility provides capability scattering a few mb/sr ∼5% absolute accuracy in energy range from 6 15 MeV. Source neutrons are provided by D(d,n)3He reaction. Scattered detected at 28 angles between 25 and 160 deg massively shielded NE218 liquid scintillator located 4 m sample. Absolute...
An optical model analysis of results from a program neutron time-of-flight measurements elastic scattering the $1\ensuremath{-}p$ shell nuclei is described. Experiments have been carried out at TUNL FN Tandem van de Graaff facility using $^{2}\mathrm{H}$(d,n)$^{3}\mathrm{He}$ reaction as source. Experimental methods and past for $^{6}\mathrm{Li}$, $^{7}\mathrm{Li}$, $^{9}\mathrm{Be}$, $^{10}\mathrm{B}$, $^{11}\mathrm{B}$, $^{12}\mathrm{C}$, $^{13}\mathrm{C}$, $^{16}\mathrm{O}$ are...
Differential cross sections are reported for the elastic and discrete inelastic scattering of neutrons from 6Li 7Li. Source were provided by 2H(d,n)3He reaction in energy range 7 to 14 MeV. Scattered detected at a distance 3.9 m angles 25 160 deg 5-deg intervals. Total obtained sum 0.478-MeV state Inelastic 2.18-MeV 4.63-MeV The results compared ENDF/B-IV predictions previous measurements. 7Li accounts less than half total tritium production section neutron interactions with
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Parity nonconserving (PNC) longitudinal analyzing powers were measured for 23 p-wave neutron resonances in $^{232}\mathrm{Th}$. Seven show effects of greater than 2.4\ensuremath{\sigma} statistical significance---the largest sample yet a single nucleus. All seven have positive sign. Strong sign correlations are not feature the conventional model parity mixing between compound nuclear states. The asymmetry was expressed as sum two terms: constant and fluctuating asymmetry. With this ansatz...
Parity nonconservation has been studied in the transmission of longitudinally polarized epithermal neutrons incident upon a $^{139}\mathrm{La}$ target. Previous experiments have demonstrated existence large value longitudinal asymmetry 0.734-eV p-wave resonance compound nucleus $^{140}\mathrm{La}$, but report conflicting values for measured asymmetry. We results an experiment at Los Alamos Neutron Scattering Center (LANSCE) which by two independent methods. One these methods utilizes...
Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text G. Gould, S. F. Jacobs, J. T. LaTourrette, M. Newstein, and P. Rabinowitz, "Coherent Detection of Light Scattered from a Diffusely Reflecting Surface," Appl. Opt. 3, 648-649 (1964) Export BibTex Endnote (RIS) HTML Plain alert Save article
We explain why the measured parity-violating asymmetries for ${\mathit{p}}_{1/2}$ compound-nuclear resonances tend to have a common sign. show that asymmetry is sum of two terms: a' average term dominated by admixtures distant levels and fluctuates from resonance nearby states. The involves single-particle transition amplitudes interaction, while fluctuating retains statistical character. Our theoretical estimate agrees with value extracted experimental data.