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P. Abreu
Instituto Superior Técnico
749Publications
46H-index
11kCitations
Publications 749
Newest
Published on Apr 24, 2019in Frontiers in Astronomy and Space Sciences
A. Aab19
Estimated H-index: 19
,
N. Borodai29
Estimated H-index: 29
+ 389 AuthorsB. Daniel21
Estimated H-index: 21
An overview of the multi-messenger capabilities of the Pierre Auger Observatory is presented. The techniques and performance of searching for Ultra-High Energy neutrinos, photons and neutrons are described. Some of the most relevant results are reviewed, such as stringent upper bounds that were placed to a flux of diffuse cosmogenic neutrinos and photons, bounds placed on neutrinos emitted from compact binary mergers that were detected by LIGO and Virgo during their first and second observing ru...
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Published on Apr 1, 2019in Nuclear Fusion 4.06
V. S. Neverov2
Estimated H-index: 2
,
A. B. Kukushkin + 1220 AuthorsM. Afzal3
Estimated H-index: 3
The data of the H alpha high-resolution spectroscopy, collected on the multiple lines of sight, which cover the entire divertor space in poloidal cross-section, during the recent hydrogen-deuterium experiments in JET-ILW (ITER-like wall), are processed. A strong spatial inhomogeneity of the hydrogen concentration, H/(H + D), in divertor is found in many pulses. Namely, the H/(H + D) ratio may be lower in the inner divertor than that in the outer divertor by the values of 0.15-0.35, depending on ...
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Published on Mar 7, 2019in Journal of Cosmology and Astroparticle Physics 5.13
A. Aab1
Estimated H-index: 1
(Fermilab),
P. Abreu46
Estimated H-index: 46
+ 15 AuthorsH. Falcke60
Estimated H-index: 60
The profile of the longitudinal development of showers produced by ultra-high energy cosmic rays carries information related to the interaction properties of the primary particles with atmospheric nuclei. In this work, we present the first measurement of the average shower profile in traversed atmospheric depth at the Pierre Auger Observatory. The shapes of profiles are well reproduced by the Gaisser-Hillas parametrization within the range studied, for E>1017.8 eV . A detailed analysis of the sy...
2 Citations Source Cite
Published on Feb 1, 2019in Fusion Engineering and Design 1.44
T. Vasilopoulou5
Estimated H-index: 5
,
I. E. Stamatelatos + 1224 AuthorsR. Villari18
Estimated H-index: 18
(ENEA)
Abstract Neutron activation technique has been widely used for the monitoring of neutron fluence at the Joint European Torus (JET) whereas it is foreseen to be employed at future fusion plants, such as ITER and DEMO. Neutron activation provides a robust tool for the measurement of neutron fluence in the complex environment encountered in a tokamak. However, activation experiments previously performed at JET showed that the activation foils used need to be calibrated in a real fusion environment ...
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Published on Jan 23, 2019in Physical Review D 4.39
A. Aab19
Estimated H-index: 19
,
F. Contreras31
Estimated H-index: 31
+ 387 AuthorsT. A. Harrison22
Estimated H-index: 22
The determination of the primary energy of extensive air showers using the fluorescence detection technique requires an estimation of the energy carried away by particles that do not deposit all their energy in the atmosphere. This estimation is typically made using Monte Carlo simulations and thus depends on the assumed primary particle mass and on model predictions for neutrino and muon production. In this work we present a new method to obtain the invisible energy from events detected by the ...
2 Citations
Published on Nov 13, 2018in The Astrophysical Journal 6.63
A. Aab10
Estimated H-index: 10
(Radboud University Nijmegen),
P. Abreu46
Estimated H-index: 46
(Instituto Superior Técnico)
+ 373 AuthorsG. A. Anastasi11
Estimated H-index: 11
We present a detailed study of the large-scale anisotropies of cosmic rays with energies above 4 EeV measured using the Pierre Auger Observatory. For the energy bins [4, 8] EeV and E >= 8 EeV, the most significant signal is a dipolar modulation in R.A. at energies above 8 EeV, as previously reported. In this paper we further scrutinize the highest-energy bin by splitting it into three energy ranges. We find that the amplitude of the dipole increases with energy above 4 EeV. The growth can be fit...
13 Citations Source Cite
Published on Oct 16, 2018in Journal of Cosmology and Astroparticle Physics 5.13
A. Aab10
Estimated H-index: 10
(Radboud University Nijmegen),
P. Abreu46
Estimated H-index: 46
(University of Lisbon)
+ 391 AuthorsG. A. Anastasi11
Estimated H-index: 11
With the Auger Engineering Radio Array (AERA) of the Pierre Auger Observatory, we have observed the radio emission from 561 extensive air showers with zenith angles between 60 degrees and 84 degrees. In contrast to air showers with more vertical incidence, these inclined air showers illuminate large ground areas of several km(2) with radio signals detectable in the 30 to 80 MHz band. A comparison of the measured radio-signal amplitudes with Monte Carlo simulations of a subset of 50 events for wh...
10 Citations Source Cite
B. Obryk14
Estimated H-index: 14
(Polish Academy of Sciences),
R. Villari18
Estimated H-index: 18
(ENEA)
+ 1229 AuthorsJ. Nash
Abstract Measurements of neutron streaming through penetrations in biological shields are being carried out at JET fusion device by means of thermoluminescence (TL) detectors with the objective to validate the neutronics codes and nuclear data widely applied in ITER nuclear analyses in a real fusion environment. TLDs response due to the neutron component of the radiation field is related to the neutron fluence in a well-defined neutron energy spectrum. Therefore, a TLDs calibration in real fusio...
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Published on Sep 1, 2018in Nuclear Fusion 4.06
D. Moulton8
Estimated H-index: 8
,
G. Corrigan17
Estimated H-index: 17
+ 1220 AuthorsK. M. Aggarwal14
Estimated H-index: 14
This paper further analyses the EDGE2D-EIRENE simulations presented by Chankin et al (2017 Nucl. Mater. Energy 12 273), of L-mode JET plasmas in vertical-vertical (VV) and Vertical-horizontal (VH) divertor configurations. As expected, the simulated outer divertor ionisation source peaks near the separatrix in VV and radially further out in VH. We identify the reflections of recycled neutrals from lower divertor tiles as the primary mechanism by which ionisation is concentrated on the outer diver...
1 Citations Source Cite
Published on Aug 1, 2018in Nuclear Fusion 4.06
S. E. Sharapov30
Estimated H-index: 30
,
H. J. C. Oliver + 1221 AuthorsM. Afzal3
Estimated H-index: 3
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