A5062346175- Atomic and Subatomic Physics Research
- Quantum, superfluid, helium dynamics
- Nuclear Physics and Applications
- Neutrino Physics Research
- Radiation Detection and Scintillator Technologies
- Ruminant Nutrition and Digestive Physiology
- Quantum Mechanics and Applications
- Radioactive Decay and Measurement Techniques
- Turfgrass Adaptation and Management
- Biofield Effects and Biophysics
- Advanced MRI Techniques and Applications
- Advanced NMR Techniques and Applications
- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Agriculture, Soil, Plant Science
- Quantum Information and Cryptography
- Superconducting Materials and Applications
- Pasture and Agricultural Systems
- Soil Carbon and Nitrogen Dynamics
- Particle Accelerators and Free-Electron Lasers
- Diatoms and Algae Research
- Biocrusts and Microbial Ecology
- Bioenergy crop production and management
- Medical Imaging Techniques and Applications
- Plant and animal studies
Hamilton College
2005-2024
Tulane University
2005-2021
Kurchatov Institute
2005
DePauw University
2005
Harvard University
2005
Indiana University Bloomington
2005
National Institute of Standards and Technology
2005
University of Sussex
2005
Rutherford Appleton Laboratory
2005
National Institute of Arthritis and Musculoskeletal and Skin Diseases
1988
(1) Measurements were made to determine the balance between photosynthesis, animal intake and losses of matter in swards maintained by 'lenient' continuous grazing sheep at a Leaf (lamina) Area Index 3.0 'hard' an LAI 1.0. (2) Gross photosynthetic uptake was greater leniently-grazed sward than hard-grazed sward. In both swards, similar proportion lost respiration or partition non-harvestable parts. Thus, shoot production under lenient also hard grazing. (3) Despite lower gross sward, this...
A discussion is given of Robert Brown's original observations particles ejected by pollen the plant \textit{Clarkia pulchella} undergoing what now called Brownian motion. We consider nature those particles, and how he misinterpreted Airy disc smallest to be universal organic building blocks. Relevant qualitative quantitative investigations with a modern microscope "homemade" single lens similar Brown's, are presented.
Abstract A perennial ryegrass sward was managed by continuous stocking with sheep (April–September) for 4 successive years after sowing. The grazed to maintain a leaf (lamina) area index (LAI) close 1.0. Areas of the were released from grazing on three occasions: once during summer in third year sowing, and twice spring fourth There marked changes structure physiology continuously stocked following release grazing. After several stocking, comprised large population small tillers LAI resulted...
‘Dark’ respiratory losses of CO2 were measured on a one year old sward S24 perennial ryegrass (Lolium perenne L.) at intervals during 74 day reproductive growth period, between April and June, 21 vegetative in July August. Part the was shaded for week before measure ments commenced. Measurements ‘dark’ respiration continued 46 hand it possible to distinguish two components which are designated ‘maintenance’ ‘synthetic’ ‘Maintenance’ taken be mean rate efflux after 40–46 h darkness. When...
We report the first result for electron-antineutrino angular correlation ($a$ coefficient) in free neutron $\ensuremath{\beta}$ decay from aCORN experiment. uses a novel method which $a$ coefficient is proportional to an asymmetry proton time of flight events where electron and recoil are detected delayed coincidence. Data presented 15 month run at NIST Center Neutron Research. obtained...
The aCORN experiment measures the neutron-decay electron-antineutrino correlation ($a$ coefficient) using a novel method based on an asymmetry in proton time-of-flight for events where beta electron and recoil are detected delayed coincidence. We report data analysis result from second run at NIST Center Neutron Research, high-flux cold neutron beam new NG-C guide end position:...
Abstract The change in structure of continuously grazed versus infrequently cut swards perennial ryegrass ( Lolium perenne L), cv. S23, was investigated during their first full harvest year. Measurements were made from early May until late September. intensity stocking by sheep the sward adjusted an attempt to maintain a high level radiation interception and harvested at approximately monthly intervals. herbage mass, lamina area index varied cyclic pattern between harvests but these...
We describe an apparatus used to measure the electron-antineutrino angular correlation coefficient in free neutron decay. The employs a novel measurement technique which is converted into proton time-of-flight asymmetry that counted directly, avoiding need for spectroscopy. Details of method, apparatus, detectors, data acquisition, and reduction scheme are presented, along with discussion important systematic effects.
The aCORN experiment measures the electron-antineutrino correlation $a$ coefficient in free neutron decay. We update previous results [G. Darius et al., Phys. Rev. Lett. 119, 042502 (2017) and M. T. Hassan C 103, 045502 (2021)] to include radiative recoil corrections first order, discuss a key issue comparison of from different $a$-coefficient experimental methods when these effects are considered. corrected combined result is...
The aCORN experiment uses a novel asymmetry method to measure the electron-antineutrino correlation ( -coefficient) in free neutron decay that does not require precision proton spectroscopy. completed two physics runs at NIST Center for Neutron Research. first run on NG-6 beam line obtained result = 0.1090 +/- 0.0030 stat ) 0.0028 (sys), most precise date. second new NG-C high flux promises an improvement ¡ 2%. In addition we show improved measurement of neutrino B can be made using...
Fundamental neutron physics, combining precision measurements and theory, probes particle physics at short range with reach well beyond the highest energies probed by LHC. Significant US efforts are underway that will probe BSM CP violation orders of magnitude more sensitivity, provide new data on Cabibbo anomaly, precisely measure lifetime decay, explore hadronic parity violation. World-leading results from Neutron Physics community since last Long Range Plan, include world's most precise...
The aCORN experiment uses a novel asymmetry method to measure the electron-antineutrino correlation (a-coefficient) in free neutron decay that does not require precision proton spectroscopy. completed two physics runs at NIST Center for Neutron Research. first run on NG-6 beam line 2013--2014 obtained result = 0.1090 +/- 0.0030 (stat) 0.0028 (sys), total uncertainty of 3.8%. second new NG-C high flux promises an improvement <2%.
This paper characterizes an imaging x-ray detector formed by coupling a gadolinium oxysulphide phosphor to the input of optical photon detector. The device is small, light, easy use, and features direct digital readout. It exhibits fairly high efficiency (40%–80%) resolution (160 μm-width point spread function) near center its 40-mm active area. There small amount pincushion distortion which seems be associated with loss in toward edge has very low noise can used at fluxes down about 0.1...
Currently, the beta-neutrino asymmetry has largest uncertainty (4 %) of neutron decay angular correlations. Without requiring polarimetry this parameter can be used to measure λ (ga/gv ), test Cabibbo-Kobayashi-Maskawa (CKM) unitarity limit scalar and tensor currents, search for Charged Vector Current (CVC) violation. We propose coeffcient, a, using time-of-flight recoil protons. hope achieve a systematic σa / ≈ 1.0 %. After tests at Indiana University's Low Energy Neutron Source (LENS),...