J. Pinto da Cunha
A5088168251- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Quantum Chromodynamics and Particle Interactions
- Atomic and Subatomic Physics Research
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Particle Accelerators and Free-Electron Lasers
- Black Holes and Theoretical Physics
- Geomagnetism and Paleomagnetism Studies
- Ionosphere and magnetosphere dynamics
- Computational Physics and Python Applications
- Medical Imaging Techniques and Applications
- Nuclear Physics and Applications
- Solar and Space Plasma Dynamics
- Quantum, superfluid, helium dynamics
- Atomic and Molecular Physics
- Cosmology and Gravitation Theories
- Nuclear physics research studies
- Calibration and Measurement Techniques
- Radiation Therapy and Dosimetry
- Atmospheric Ozone and Climate
- Fault Detection and Control Systems
- Advanced machining processes and optimization
University of Coimbra
2007-2022
LIP - Laboratory of Instrumentation and Experimental Particle Physics
2000-2022
Rutherford Appleton Laboratory
2009-2012
University of Sheffield
2007-2009
University of Oxford
2009
Texas A&M University
2009
University of Edinburgh
2009
University of Rochester
2009
University of California, Los Angeles
2009
Imperial College London
2007-2009
The ZEPLIN-III experiment in the Palmer Underground Laboratory at Boulby uses a 12 kg two-phase xenon time-projection chamber to search for weakly interacting massive particles (WIMPs) that may account dark matter of our Galaxy. detector measures both scintillation and ionization produced by radiation liquid differentiate between nuclear recoils expected from WIMPs electron-recoil background signals down $\ensuremath{\sim}10\text{ }\text{ }\mathrm{keV}$ nuclear-recoil energy. An analysis...
The design and performance of the LUX-ZEPLIN (LZ) detector is described as March 2015 in this Conceptual Design Report. LZ a second-generation dark-matter with potential for unprecedented sensitivity to weakly interacting massive particles (WIMPs) masses from few GeV/c2 hundreds TeV/c2. With total liquid xenon mass about 10 tonnes, will be most sensitive experiment WIMPs region by end decade. This report describes detail technical systems. Expected backgrounds are quantified presented....
We report experimental upper limits on WIMP-nucleon elastic scattering cross sections from the second science run of ZEPLIN-III at Boulby Underground Laboratory. A raw fiducial exposure 1344 kg⋅days was accrued over 319 days continuous operation between June 2010 and May 2011. total eight events observed in signal acceptance region nuclear recoil energy range 7–29 keV, which is compatible with background expectations. This allows exclusion scalar cross-section above 4.8×10−8 pb near 50...
Abstract LUX-ZEPLIN (LZ) is a second-generation direct dark matter experiment with spin-independent WIMP-nucleon scattering sensitivity above $${1.4 \times 10^{-48}}\, {\hbox {cm}}^{2}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>1.4</mml:mn> <mml:mo>×</mml:mo> <mml:msup> <mml:mn>10</mml:mn> <mml:mo>-</mml:mo> <mml:mn>48</mml:mn> </mml:mrow> </mml:msup> <mml:mspace/> <mml:mtext>cm</mml:mtext> <mml:mn>2</mml:mn> </mml:math> for WIMP mass of $${40}\, \hbox...
We studied the application of statistical reconstruction algorithms, namely maximum likelihood and least squares methods, to problem event in a dual phase liquid xenon detector. An iterative method was developed for in-situ PMT light response functions from calibration data taken with an uncollimated gamma-ray source. Using techniques described, performance ZEPLIN-III dark matter detector 122 keV gamma-rays. For inner part (R<100 mm), spatial resolutions 13 mm 1.6 FWHM were measured...
We use fits to recent published CPLEAR data on neutral kaon decays $π^+π^-$ and $πeν$ constrain the CPT--violation parameters appearing in a formulation of system as an open quantum-mechanical system. The obtained upper limits are approaching range suggested by certain ideas concerning quantum gravity.
We present new experimental constraints on the WIMP-nucleon spin-dependent elastic cross sections using data from first science run of ZEPLIN-III, a two-phase xenon experiment searching for galactic dark matter weakly interacting massive particles based at Boulby mine. Analysis ∼450 kg·days fiducial exposure allow us to place 90%-confidence upper limit pure WIMP-neutron section σn=1.9×10−2 pb 55 GeV/c2 WIMP mass. Recent calculations nuclear spin structure Bonn charge-dependent...
Scintillation and ionisation yields for nuclear recoils in liquid xenon above 10 keVnr (nuclear recoil energy) are deduced from data acquired using broadband Am-Be neutron sources. The several exposures to two sources were compared detailed simulations. Energy-dependent scintillation giving acceptable fits the derived. Efficiency resolution effects treated a light collection Monte Carlo, measured photomultiplier response profiles hardware trigger studies. A gradual fall yield below ~40 is...
We present limits on the WIMP-nucleon cross section for inelastic dark matter derived from 2008 run of ZEPLIN-III. Cuts, notably scintillation pulse shape and scintillation-to-ionisation ratio, give a net exposure 63 kg.days in range 20-80keV nuclear recoil energy, which 6 events are observed. Upper signal rate maximum empty patch data. Under standard halo assumptions small region parameter space consistent, at 99% CL, with causing 1.17 ton.year DAMA modulation is allowed 90% CL: it mass...
Gaseous and liquid xenon particle detectors are being used in a number of applications including dark matter search neutrino-less double beta decay experiments. Polytetrafluoroethylene (PTFE) is often these both as electrical insulator light reflector to improve the efficiency detection scintillation photons. However, emits vacuum ultraviolet (VUV) wavelength region (λ≃175 nm) where reflecting properties PTFE not sufficiently known. In this work, we report on measurements reflectance, its...