R. Hall-Wilton
A5066106967- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Nuclear Physics and Applications
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Atomic and Subatomic Physics Research
- Nuclear reactor physics and engineering
- Computational Physics and Python Applications
- Neutrino Physics Research
- Radiation Therapy and Dosimetry
- Medical Imaging Techniques and Applications
- Diamond and Carbon-based Materials Research
- Black Holes and Theoretical Physics
- Astrophysics and Cosmic Phenomena
- Metal and Thin Film Mechanics
- Boron and Carbon Nanomaterials Research
- High-pressure geophysics and materials
- Particle Accelerators and Free-Electron Lasers
- Radiation Effects in Electronics
- Photocathodes and Microchannel Plates
- Nuclear Materials and Properties
- CCD and CMOS Imaging Sensors
European Spallation Source
2015-2024
University of Glasgow
2020-2024
Fondazione Bruno Kessler
2023-2024
University of Milano-Bicocca
2019-2023
University of Wisconsin–Madison
2009-2022
University of Bonn
2022
HUN-REN Centre for Energy Research
2020
Hungarian Academy of Sciences
2020
Mid Sweden University
2014-2019
Institute of High Energy Physics
1999-2017
Due to the very limited availability of 3He, new kinds neutron detectors, not based on are urgently needed. Here, we present a method produce thin films 10B4C, with maximized detection efficiency, intended be part generation large area detectors. B4C have been deposited onto Al-blade and Si wafer substrates by dc magnetron sputtering from natB4C 10B4C targets in an Ar discharge, using industrial deposition system. The were characterized scanning electron microscopy, elastic recoil analysis,...
Very intense neutrino beams and large detectors will be needed in order to enable the discovery of CP violation leptonic sector. We propose use proton linac European Spallation Source currently under construction Lund, Sweden deliver, parallel with spallation neutron production, a very intense, cost effective high performance beam. The baseline program for is that it fully operational at 5 MW average power by 2022, producing 2 GeV 2.86 ms long pulses rate 14 Hz. Our proposal upgrade 10 28...
An overview is provided of the 15 neutron beam instruments making up initial instrument suite European Spallation Source (ESS), and being made available to user community. The ESS source consists a high-power accelerator target station, providing unique long-pulse time structure slow neutrons. design considerations behind structure, moderator geometry layout are presented. 15-instrument two small-angle instruments, reflectometers, an imaging beamline, single-crystal diffractometers; one for...
The violation of Baryon Number, $\mathcal{B}$, is an essential ingredient for the preferential creation matter over antimatter needed to account observed baryon asymmetry in universe. However, such a process has yet be experimentally observed. HIBEAM/NNBAR %experiment program proposed two-stage experiment at European Spallation Source (ESS) search number violation. will include high-sensitivity searches processes that violate by one or two units: free neutron-antineutron oscillation...
A small electromagnetic sampling calorimeter, installed in the ZEUS experiment 1995, significantly enhanced acceptance for very low x and Q^2 inelastic neutral current scattering, e^{+}p \to e^{+}X, at HERA. measurement of proton structure function F_2 total virtual photon-proton (\gamma^*p) cross-section is presented 0.11 \le Q^{2} 0.65 GeV^2 2 \times 10^{-6} 6 10^{-5}, corresponding to a range \gamma^{*}p c.m. energy 100 W 230 GeV. Comparisons with various models are also presented.
The photoproduction reaction gamma p -> mu+ mu- has been studied in ep interactions using the ZEUS detector at HERA. data sample corresponds to an integrated luminosity of 43.2 pb^{-1}. Upsilon meson observed for first time. sum products elastic Upsilon(1S), Upsilon(2S), Upsilon(3S) cross sections with their respective branching ratios is determined be 13.3 +- 6.0(stat.)^{+2.7}_{-2.3}(syst.) pb a mean photon-proton centre mass energy 120 GeV. section above prediction perturbative QCD model.
This paper presents measurements of D∗± production in deep inelastic scattering from collisions between 27.5 GeV positrons and 820 protons. The data have been taken with the ZEUS detector at HERA. decay channel D∗+ → (D0 K−π+)π+ (+c.c) has used study. e+p cross section for inclusive 5 < Q2 100 GeV2> y 0.7 is 5.3 ± 1.0 0.8 nb kinematic region 1.3 pT(D∗±) 9.0 |η(D∗±)| 1.5. Differential sections as functions pT(D∗±), η(D∗±), W are compared next-to-leading order QCD calculations based on...
Thin films of 10B4C have shown to be very suitable as neutron-converting material in the next generation neutron detectors, replacing previous predominantly used 3He. In this contribution we show under realistic conditions that are not damaged by irradiation and interactions, which they will exposed many years a detector. 1 μm thick thin were deposited onto Al or Si substrates using dc magnetron sputtering. As-deposited cold beam with fluences up 1.1×1014 cm−2 mean wavelength 6.9 Å. Both...
B4C coatings for 10B-based neutron detector applications were deposited using high-power impulse magnetron sputtering (HiPIMS) and direct current (DCMS) processes. The on Si(001) as well flat macrostructured (grooved) Al blades in an industrial coating unit compound targets Ar. HiPIMS DCMS processes conducted at substrate temperatures of 100 400 °C the Ar pressure was varied between 300 800 mPa. Neutron detector-relevant characterization performed properties evaluated with regard to their...
We report on an investigation of the fast-neutron spectrum emitted by 241Am/9Be. Well-understood shielding, coincidence, and time-of-flight measurement techniques are employed to produce a continuous, polychromatic, energy-tagged neutron beam.
A Geant4-based Python/C++ simulation and coding framework, which has been developed used in order to aid the R&D efforts for thermal neutron detectors at scattering facilities, is described. Built upon configurable geometry generator modules, it integrates a general purpose object oriented output file format with meta-data, facilitate faster turn-around time when setting up analysing simulations. Also discussed are extensions Geant4 have implemented include effects of low-energy phenomena...
Currently, many detector technologies for thermal neutron detection are in development order to lower the demand rare 3He gas. Gas detectors with solid thin film converters readout by gas proportional counter method have been proposed as an appropriate choice applications where large area coverage is necessary. In this paper, we investigate probability gamma-rays generate a false count measurement. Simulated results compared measurement 10B prototype and detector. It demonstrated that equal...
Despite its present shortage, <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$^{\rm 3}{\rm He}$</tex></formula> continues to be the most common neutron converter for detectors in scattering science. However, it is obvious that development of large area based on alternative converters rapidly becoming a matter urgency. In technique presented here, grids each comprising 28 Notation="TeX">$^{10}{\rm...
Due to the present shortage of 3He and associated tremendous increase its price, supply large neutron detection systems with becomes unaffordable. Alternative concepts, therefore, have been invented based on solid 10B converters. These concepts require development in thin film deposition technique regarding high adhesion, thickness uniformity chemical purity converter coating area substrates. We report sputter highly uniform large-area 10B4C coatings up 2 μm a deviation below 4% using...
The Multi-Grid detector technology has evolved from the proof-of-principle and characterisation stages. Here we report on performance of detector, MG.CNCS prototype, which been installed tested at Cold Neutron Chopper Spectrometer, CNCS SNS. This allowed a side-by-side comparison to 3He detectors an operational instrument. demonstrator active area 0.2 m2. It is specifically tailored specifications CNCS. was in June 2016 operated since then, collecting neutron scattering data parallel He-3 In...
The ambitious instrument suite for the future European Spallation Source whose civil construction started recently in Lund, Sweden, demands a set of diverse and challenging requirements neutron detectors. For instance, unprecedented high flux expected on samples to be investigated diffraction or reflectometry experiments requires detectors that can handle counting rates, while investigation sub-millimeter protein crystals will only possible with large-area achieve position resolution as low...
10B films have been studied as neutron convertors in semi-conductors [1], and different types of gas proportional counters for scattering applications: example [2] the detector is...
The Multi-Blade is a Boron-10-based gaseous detector introduced to face the challenge arising in neutron reflectometry at pulsed sources. Neutron reflectometers are most challenging instruments terms of instantaneous counting rate and spatial resolution. This has been designed cope with requirements set for upcoming European Spallation Source (ESS) Sweden. Based on previous results obtained Institut Laue-Langevin (ILL) France, an improved demonstrator built ESS tested Budapest Centre (BNC)...
The European Spallation Source (ESS), currently under construction in Lund, Sweden, is a research center that will provide, by 2023, the world’s most powerful neutron source. average power of proton linac be 5 MW. Pulsing this at higher frequency make it possible to raise total beam 10 MW produce, parallel with spallation production, very intense neutrino Super Beam about 0.4 GeV mean energy. This allow searching for leptonic CP violation second oscillation maximum where sensitivity 3 times...