A5080274226- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Nuclear physics research studies
- Particle Detector Development and Performance
- Astrophysics and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Nuclear Physics and Applications
- Superconducting Materials and Applications
- Radiation Therapy and Dosimetry
- X-ray Spectroscopy and Fluorescence Analysis
- Radioactive contamination and transfer
- Atomic and Molecular Physics
- Spacecraft and Cryogenic Technologies
- Age of Information Optimization
- Cold Atom Physics and Bose-Einstein Condensates
- Integrated Circuits and Semiconductor Failure Analysis
- Advanced Semiconductor Detectors and Materials
- Random lasers and scattering media
- Porphyrin and Phthalocyanine Chemistry
- solar cell performance optimization
- Advanced NMR Techniques and Applications
- Inorganic Fluorides and Related Compounds
- Terahertz technology and applications
LIP - Laboratory of Instrumentation and Experimental Particle Physics
2019-2025
University of Lisbon
2020-2025
Iscte – Instituto Universitário de Lisboa
2024
Campbell Collaboration
2023
TU Dresden
2012-2021
Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
2008-2012
University of Trieste
2008-2011
Istituto Nazionale di Fisica Nucleare, Sezione di Padova
2007-2008
SNO+ is a large liquid scintillator-based experiment located 2km underground at SNOLAB, Sudbury, Canada. It reuses the Sudbury Neutrino Observatory detector, consisting of 12m diameter acrylic vessel which will be filled with about 780 tonnes ultra-pure scintillator. Designed as multipurpose neutrino experiment, primary goal search for neutrinoless double-beta decay (0$\nu\beta\beta$) 130Te. In Phase I, detector loaded 0.3% natural tellurium, corresponding to nearly 800 kg 130Te, an expected...
In 2006 the PVLAS collaboration reported observation of an optical rotation generated in vacuum by a magnetic field. To further check against possible instrumental artifacts, several upgrades to apparatus have been made during past year. Two data taking runs, at wavelength 1064 nm, performed new configuration with field strengths 2.3 and 5 T. The T value was chosen order avoid stray fields. observations do not show presence signal down levels...
The CERN Axion Solar Telescope (CAST) has extended its search for solar axions by using 3He as a buffer gas. At T=1.8 K this allows larger pressure settings and hence sensitivity to higher axion masses than our previous measurements with 4He. With about 1 h of data taking at each 252 different we have scanned the mass range 0.39 eV < m_a 0.64 eV. From absence excess X-rays when magnet was pointing Sun set typical upper limit on axion-photon coupling g_ag 2.3 x 10^{-10} GeV^{-1} 95% CL, exact...
Abstract New developments in liquid scintillators, high-efficiency, fast photon detectors, and chromatic sorting have opened up the possibility for building a large-scale detector that can discriminate between Cherenkov scintillation signals. Such could reconstruct particle direction species using light while also having excellent energy resolution low threshold of scintillator detector. Situated deep underground, utilizing new techniques computing reconstruction, this achieve unprecedented...
The nuclear physics input from the He3(α,γ)Be7 cross section is a major uncertainty in fluxes of Be7 and B8 neutrinos Sun predicted by solar models Li7 abundance obtained big-bang nucleosynthesis calculations. present work reports on new precision experiment using activation technique at energies directly relevant to nucleosynthesis. Previously such low had been reached experimentally only prompt-γ with inferior precision. Using windowless gas target, high beam intensity, background...
Solar neutrino fluxes depend both on astrophysical and nuclear physics inputs, namely the cross sections of reactions responsible for production inside core. While flux solar $^{8}\mathrm{B}$ neutrinos has been recently measured at Superkamiokande with a 3.5% uncertainty precise measurement $^{7}\mathrm{Be}$ is foreseen in next future, predicted are still affected by larger errors. The largest to determine comes from...
The flux of Be7 and B8 neutrinos from the Sun production Li7 via primordial nucleosynthesis depend on rate He3(α,γ)Be7 reaction. In an extension a previous study showing cross section data at 127–167 keV center-of-mass energy, present work reports measurement 106 performed Italy's Gran Sasso underground laboratory by activation method. This energy is closer to solar Gamow than ever reached before. result σ=0.567±0.029stat±0.016syst nb. are compared with studies high recommended S(0) value...
EOS is a technology demonstrator, designed to explore the capabilities of hybrid event detection technology, leveraging both Cherenkov and scintillation light simultaneously. With fiducial mass four tons, operate in high-precision regime, with sufficient size utilize time-of-flight information for full reconstruction, flexibility demonstrate range cutting edge technologies, simplicity design facilitate potential future deployment at alternative sites. Results from can inform neutrino...
The direction of individual <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mmultiscripts><a:mrow><a:mi mathvariant="normal">B</a:mi></a:mrow><a:mprescripts/><a:none/><a:mrow><a:mn>8</a:mn></a:mrow></a:mmultiscripts></a:mrow></a:math> solar neutrinos has been reconstructed using the <d:math xmlns:d="http://www.w3.org/1998/Math/MathML" display="inline"><d:mrow><d:mi>SNO</d:mi><d:mo>+</d:mo></d:mrow></d:math> liquid scintillator detector. Prompt, directional...
Abstract The SNO $$+$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mo>+</mml:mo> </mml:math> collaboration reports its first spectral analysis of long-baseline reactor antineutrino oscillation using 114 tonne-years data. Fitting the neutrino probability to observed energy spectrum yields constraints on mass-squared difference $$\Delta m^2_{21}$$ <mml:mrow> <mml:mi>Δ</mml:mi> <mml:msubsup> <mml:mi>m</mml:mi> <mml:mn>21</mml:mn> <mml:mn>2</mml:mn> </mml:msubsup> </mml:mrow>...
Experimental bounds on induced vacuum magnetic birefringence can be used to improve present photon-photon scattering limits in the electronvolt energy range. Measurements with Polarizzazione del Vuoto con Laser apparatus [E. Zavattini et al., Phys. Rev. D 77, 032006 (2008)] at both $\ensuremath{\lambda}=1064$ and 532 nm lead parameter ${A}_{e}$, describing nonlinear effects QED, of ${A}_{e}^{(1064)}<6.6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}21}\text{ }\text{...
A measurement of the $^{8}\mathrm{B}$ solar neutrino flux has been made using a 69.2 kt-day dataset acquired with $\mathrm{SNO}+$ detector during its water commissioning phase. At energies above 6 MeV is an extremely pure sample elastic scattering events, owing primarily to detector's deep location, allowing accurate relatively little exposure. In that energy region best fit background rate $0.2{5}_{\ensuremath{-}0.07}^{+0.09}\text{ }\text{...
The SNO+ Collaboration reports the first evidence of reactor antineutrinos in a Cherenkov detector. nearest nuclear reactors are located 240 km away Ontario, Canada. This analysis uses events with energies lower than any previous large water Two analytical methods used to distinguish from background 190 days data and yield consistent for combined significance 3.5σ.
A preferred candidate for neutrinoless double-\ensuremath{\beta} decay, ${}^{150}$Nd, is present in natural neodymium at an abundance level of 5.64$%$. However, could be activated by cosmic rays during the period it spends on Earth's surface. Its activation protons therefore interest when comes to estimating possible disturbance effects and increased background double-\ensuremath{\beta}-decay experiments like Sudbury Neutrino Observatory plus liquid scintillator (SNO+). In most cases, we...
The SNO+ experiment is the follow up of SNO experiment, replacing heavy water volume with about 780 tons liquid scintillator (LAB) in order to shift sensitive threshold lower energy range. 6000 m.w.e. natural rock shielding, and use ultra-clean materials makes detector suitable for detection pep CNO solar neutrinos, geo-neutrinos, reactor neutrinos possible observation from supernovae. Complementing this program, will also search 150Nd (5.6% abundance) neutrinoless double beta decay, loading...
This paper reports results from a search for single and multi-nucleon disappearance the $^{16}$O nucleus in water within \snoplus{} detector using all of available data. These so-called "invisible" decays do not directly deposit energy but are instead detected through their subsequent nuclear de-excitation gamma-ray emission. New limits given partial lifetimes: $\tau(n\rightarrow inv) > 9.0\times10^{29}$ years, $\tau(p\rightarrow 9.6\times10^{29}$ $\tau(nn\rightarrow 1.5\times10^{28}$...
The $\mathrm{SNO}+$ experiment collected data as a low-threshold water Cherenkov detector from September 2017 to July 2019. Measurements of the 2.2-MeV $\ensuremath{\gamma}$'s produced by neutron capture on hydrogen were made using an Am-Be calibration source, for which large fraction emitted neutrons are simultaneously with 4.4-MeV $\ensuremath{\gamma}$. Analysis delayed coincidence between $\ensuremath{\gamma}$ and revealed detection efficiency that is centered around 50% varies at level...
The High Energy Physics community can benefit from a natural synergy in research activities into next-generation large-scale water and scintillator neutrino detectors, now being studied for remote reactor monitoring, discovery exclusion applications cooperative nonproliferation contexts. Since approximately 2010, US researchers, supported by the National Nuclear Security Administration (NNSA), have been studying range of possible relatively large (100 ton) to very (hundreds kiloton)...
The effect of temperature changes on the light output LAB based liquid scintillator is investigated in a range from $$-5$$ to $$30\,^{\circ }$$ C with $$\alpha $$ -particles and electrons small scale setup. Two PMTs observe inside cylindrically shaped aluminum cuvette that heated or cooled dependent PMT sensitivity monitored corrected. -emitting isotopes dissolved radon gas natural Samarium (bound solution) excite mixtures variation are observed by fitting spectra. Furthermore, also compton...
The SNO+ experiment is the follow up of SNO. detector located 2 km underground in Vale Canada Ltd.’s Creighton Mine near Sudbury, Ontario, Canada. active volume consists 780 tonnes Linear Alkyl Benzene (LAB) an acrylic vessel 12 m diameter, surrounded by about 9500 PMTs. main goal search for neutrinoless double beta decay 130Te. With initial loading 0.3% natural tellurium (nearly 800 kg 130Te), it expected to reach a sensitivity on effective Majorana neutrino mass 100 meV after several years...