ARAUCARIA

High-Energy & Multimessenger Astrophysics

Prof. Rita de Cássia dos Anjos · UFSCar São José do Rio Preto

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About — Who we are

About ARAUCARIA

ARAUCARIA is a High-Energy and Multimessenger Astrophysics research group based at UFSCar, Campus São José do Rio Preto. We study some of the most extreme environments in the Universe, from the Galactic Center and supernova remnants to active galaxies, relativistic jets and black holes.

Who we are

Our approach combines astroparticle physics, theoretical modelling, numerical simulations, high-energy observations and scientific instrumentation. The group also creates bridges between fundamental astrophysics and interdisciplinary applications in environmental sensing, data science, education and accessibility.

Mission

Our mission is to advance the understanding of cosmic accelerators and multimessenger phenomena while training new researchers in an open, collaborative and internationally connected scientific environment.

Why ARAUCARIA?

The name ARAUCARIA honors the Araucaria tree, one of the most recognizable symbols of Paraná, where the group leader developed an important part of her academic career at the Federal University of Paraná. The tree is also a metaphor for the group itself: a common scientific foundation supporting multiple research branches that grow in different directions while remaining connected.

ARAUCARIA also stands for Astrophysical Research Advancing Understanding of Cosmic Accelerators, Radiation, Interactions and Astroparticles.

Scientific environment

The group is connected to national and international collaborations in high-energy astrophysics and astroparticle physics, including research related to the Pierre Auger Observatory and the Cherenkov Telescope Array Observatory (CTAO).

Collaborations

ARAUCARIA participates in and collaborates with national and international research networks in high-energy astrophysics, astroparticle physics and scientific instrumentation. These connections support joint research, student training, international mobility and participation in large scientific facilities.

People — Team

People

ARAUCARIA brings together researchers and students working across high-energy astrophysics, astroparticle physics, numerical simulations, multimessenger science and interdisciplinary applications of cosmic-ray physics.

Rita de Cássia dos Anjos

Group Leader — Professor of Physics and Astrophysics, UFSCar

Ultra-high-energy cosmic rays, multimessenger astrophysics, relativistic jets, gamma rays, compact objects

Her research focuses on the origin, acceleration, propagation and multimessenger signatures of high-energy cosmic particles, with emphasis on cosmic rays, relativistic jets, gamma rays, compact objects and numerical modelling. She has been a member of the Pierre Auger Collaboration since 2014 and of CTA/CTAO since 2015.

ORCID · Lattes · Scholar

Samuel V. B. da Silva

PhD Student — UFSCar

FR0 radio galaxies; relativistic jets and high-energy emission

PhD project on low-power radio galaxies as high-energy emitters, combining jet dynamics with gamma-ray modelling. Member of the relativistic jets working line.

ORCID · Lattes

André Cardoso

PhD Researcher / Collaborator

FR0 sources; high-energy astrophysics; co-supervised research

Co-supervised research on FR0 radio galaxies and their multimessenger signatures. Works across modelling and data comparison for nearby active galaxies.

ORCID

Luana N. Padilha

PhD Student — UFSCar

Particle acceleration, shocks, supernova remnants and cosmic rays

Studies oblique shocks in supernova remnants in massive star clusters and their role in shaping the cosmic-ray spectrum around the knee region.

ORCID · Lattes

Juliana Kellys

MSc Student — UFSCar

Blazars, neutrinos and multimessenger astrophysics

MSc project connecting blazar gamma-ray activity with neutrino expectations in multimessenger scenarios.

Lattes

Luiz Felipe Ferreira

MSc Student / Collaborator — UFSCar

High-energy emission from radio galaxies / Pictor A

Works on high-energy modelling of the nearby radio galaxy Pictor A, linking jet structure to gamma-ray detectability.

Lattes

Willian C. de Paula

MSc Student / Collaborator — UFSCar

Relativistic jets and numerical simulations

Develops relativistic hydrodynamic simulations of jets, focusing on propagation, precession and interaction with the ambient medium.

Lattes

Leandro H. Nunes

Collaborating Student — UFSCar

Air-shower and particle simulations with Geant4

Works on particle-transport and air-shower simulations with Geant4 to support high-energy instrumentation studies.

Lattes

Rubens — to be confirmed

Postdoctoral Researcher — affiliation to be confirmed

Research topic to be confirmed before publication

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Alumni & Group History

Former students and collaborators who passed through the group will be listed here, with their period in ARAUCARIA and current position. Send names, photos with authorization, Lattes/ORCID links and one-line research topics to complete this section.

Alumni list to be confirmed — coming soon.

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Research — Lines

Research

Eight connected research lines, from particle acceleration to environmental applications. Specific ongoing efforts live under Projects.

Cosmic Rays & Astroparticles

General objective: To understand the origin, acceleration, composition and propagation of cosmic rays, from Galactic energies to the ultra-high-energy regime.

We investigate how charged particles are accelerated in extreme astrophysical environments, how they interact with magnetic and radiation fields during propagation, and how their energy spectrum, composition and arrival directions can be connected to candidate sources.

Multimessenger Astrophysics

General objective: To combine different cosmic messengers to constrain the physical processes operating in the most energetic sources in the Universe.

Cosmic rays, gamma rays and neutrinos provide complementary information about particle acceleration and interactions. We develop source and propagation models that connect these messengers.

Galactic High-Energy Astrophysics

General objective: To investigate energetic particle acceleration and non-thermal radiation in Galactic sources and environments.

Our work includes supernova remnants, pulsar wind nebulae, magnetars, massive-star environments and the Galactic Center.

Extragalactic High-Energy Astrophysics

General objective: To understand how active galaxies, radio galaxies and other extragalactic systems accelerate particles and produce high-energy radiation.

We study black-hole-powered sources, active galactic nuclei and radio galaxies as potential accelerators of cosmic rays and emitters of gamma rays and neutrinos.

Relativistic Jets & Compact Objects

General objective: To investigate the dynamics, structure and particle-acceleration environments of relativistic outflows powered by compact objects.

We use relativistic hydrodynamic and magnetohydrodynamic modelling to explore jets from black holes and compact systems.

Computational Astrophysics & Data-Driven Methods

General objective: To develop and apply numerical, computational and data-analysis tools to complex problems in high-energy astrophysics.

Hydrodynamic and magnetohydrodynamic simulations, cosmic-ray propagation codes, gamma-ray analysis tools and data-driven methods connect theory to observables.

Fundamental Physics with High-Energy Messengers

General objective: To use high-energy astrophysical particles as probes of fundamental physics under conditions inaccessible to terrestrial laboratories.

This line includes studies of possible deviations from Lorentz invariance and their effects on particle propagation, interactions and atmospheric showers.

Cosmic-Ray Neutron Sensing & Environmental Physics

General objective: To apply cosmic-ray particle physics to environmental monitoring, with emphasis on soil moisture and water dynamics.

Cosmic-ray neutron sensing provides non-invasive measurements of soil moisture over scales larger than conventional point sensors.

Projects — Ongoing

Projects

Selected ongoing and representative projects. Each card lists area, team, funding and outputs where available.

Ultra-High-Energy Cosmic Rays and Multimessenger Signatures

We investigate the origin and propagation of ultra-high-energy cosmic rays and the gamma-ray and neutrino signals associated with their interactions.

Area: Cosmic Rays & Astroparticles · Status: Ongoing · Team: R. dos Anjos, L. Padilha · Funding: CNPq / FAPESP (to confirm)

Relativistic Jets and Radio Galaxies

This project studies the dynamics and high-energy signatures of relativistic jets using numerical hydrodynamic and magnetohydrodynamic simulations.

Area: Extragalactic High-Energy Astrophysics · Status: Ongoing · Team: S. da Silva, A. Cardoso, W. de Paula, L. F. Ferreira · Funding: CAPES / FAPESP (to confirm)

Galactic Accelerators and Gamma-Ray Sources

We model high-energy emission from Galactic systems such as supernova remnants, pulsar wind nebulae and magnetar environments.

Area: Galactic High-Energy Astrophysics · Status: Ongoing · Team: L. Padilha, R. dos Anjos · Funding: to confirm

Lorentz Invariance Violation in High-Energy Astrophysics

This project explores how possible Lorentz-invariance-violating effects could modify the propagation and interactions of high-energy particles.

Area: Fundamental Physics · Status: Ongoing · Team: R. dos Anjos, L. Nunes · Funding: to confirm

Cosmic-Ray Neutron Sensing for Soil Moisture

We apply cosmic-ray neutron sensing to soil-moisture monitoring and environmental physics, combining neutron measurements with hydrological modelling and machine learning.

Area: CRNS & Environmental Physics · Status: Ongoing · Team: to confirm · Funding: to confirm

Accessible High-Energy Astrophysics

We develop inclusive science-communication tools in astronomy, astrophysics and particle physics, including tactile, Braille, 3D-printed and audio-described resources.

Area: Outreach & Accessibility · Status: Ongoing · Team: whole group · Funding: to confirm

Publications — Full list via ORCID

Publications

Our publications span cosmic-ray physics, multimessenger astrophysics, Galactic and extragalactic gamma-ray sources, relativistic jets, compact objects, numerical simulations and interdisciplinary applications of cosmic-ray physics.

Hadronic origin of gamma rays and neutrinos from blazars: Multi-messenger implications and observational constraints

Rodrigo Sasse; R.C. dos Anjos. Hadronic origin of gamma rays and neutrinos from blazars: Multi-messenger implications and observational constraints. Astroparticle Physics, 2027. Read paper

Probing Lorentz invariance violation in cosmogenic neutrino propagation with KM3-230213A

Rodrigo Sasse; Rodrigo Guedes Lang; Rita C Anjos. Probing Lorentz invariance violation in cosmogenic neutrino propagation with KM3-230213A. Monthly Notices of the Royal Astronomical Society, 2026. Read paper

Ultra-high-energy particle production in binary mergers endowed with magnetic fields

Carlos H. Coimbra-Araújo; Rita C. Anjos; Jonas P. Pereira; Jaziel G. Coelho. Ultra-high-energy particle production in binary mergers endowed with magnetic fields. Physical Review D, 2026. Read paper

Multiwavelength study of non-thermal emission in the Swift J1834.9-0846/W41 region

Manoel F. Sousa; Rita C. Dos Anjos; Vitor de Souza. Multiwavelength study of non-thermal emission in the Swift J1834.9-0846/W41 region. Journal of High Energy Astrophysics, 2026. Read paper

Non-thermal emission from the vicinity of the magnetar CXOU J171405.7–381031

Manoel F Sousa; Rita C Anjos. Non-thermal emission from the vicinity of the magnetar CXOU J171405.7–381031. Monthly Notices of the Royal Astronomical Society, 2026. Read paper

Constraining leptonic and hadronic γ-ray emission from HESS J1825−137 and its environment

Rubens Costa, Jr.; R C Anjos. Constraining leptonic and hadronic γ-ray emission from HESS J1825−137 and its environment. Monthly Notices of the Royal Astronomical Society, 2026. Read paper

Centaurus A inner lobes – I. Hydrodynamic modelling of a precessing jet

Rita C Anjos; Brian Reville. Centaurus A inner lobes – I. Hydrodynamic modelling of a precessing jet. Monthly Notices of the Royal Astronomical Society, 2026. Read paper

Probing low-luminosity gamma-ray emission from SNR G296.5+10.0 and CCO 1E 1207.4-5209 with CTAO

Luana N. Padilha; Rubens Costa; Rita C. dos Anjos; Jaziel G. Coelho. Probing low-luminosity gamma-ray emission from SNR G296.5+10.0 and CCO 1E 1207.4-5209 with CTAO. The European Physical Journal C, 2026. Read paper

FR0 radio galaxy jets – I. Linking jet dynamics and high-energy emission in LEDA 55267 and LEDA 58287

A F S Cardoso; R C Anjos. FR0 radio galaxy jets – I. Linking jet dynamics and high-energy emission in LEDA 55267 and LEDA 58287. Monthly Notices of the Royal Astronomical Society, 2026. Read paper

Oblique Shocks at Supernova Remnants in Massive Star Clusters: A Model for the Cosmic-Ray Knee Observed by LHAASO

Luana N. Padilha; R. C. Dos Anjos. Oblique Shocks at Supernova Remnants in Massive Star Clusters: A Model for the Cosmic-Ray Knee Observed by LHAASO. The Astrophysical Journal, 2026. Read paper

High-Synchrotron-Peaked BL Lacs as Multi-Messenger Sources: Connecting Ultra-High-Energy Cosmic Rays and Neutrinos

Luiz Augusto Stuani Pereira; Rita C. Anjos. High-Synchrotron-Peaked BL Lacs as Multi-Messenger Sources: Connecting Ultra-High-Energy Cosmic Rays and Neutrinos. Galaxies, 2026. Read paper

Energy deposition by galactic cosmic rays and implications for ozone chemistry

Luiz A. Stuani Pereira; Rita C. Anjos. Energy deposition by galactic cosmic rays and implications for ozone chemistry. Physical Review D, 2026. Read paper

Massive star clusters as sources of high-energy gamma radiation

Luana N Padilha; Rita C Anjos. Massive star clusters as sources of high-energy gamma radiation. Monthly Notices of the Royal Astronomical Society, 2025. Read paper

UHECRs Propagation and Their Multimessengers: Upper Limits and the Impact of the Extragalactic Magnetic Field

Rodrigo Sasse; Rubens Costa, Jr.; Adriel G.B. Mocellin; Carlos H. Coimbra-Araujo et al.. UHECRs Propagation and Their Multimessengers: Upper Limits and the Impact of the Extragalactic Magnetic Field. The Astrophysical Journal, 2025. Read paper

A inclusão de alunos com deficiência visual: uma análise acerca das publicações em eventos nacionais de ensino de Física

Thais Cristina dos Santos; Camila Tonezer; Rita de Cássia dos Anjos. A inclusão de alunos com deficiência visual: uma análise acerca das publicações em eventos nacionais de ensino de Física. Cadernos de Pós-graduação, 2025. Read paper

Bethe–Heitler Cascades and Hard Gamma-Ray Spectra in Flaring TeV Blazars: 1ES 0414009 and 1ES 1959650

Samuel Victor Bernardo da Silva; Luiz Augusto Stuani Pereira; Rita de Cássia Dos Anjos. Bethe–Heitler Cascades and Hard Gamma-Ray Spectra in Flaring TeV Blazars: 1ES 0414009 and 1ES 1959650. Universe, 2025. Read paper

Bethe-Heitler Cascades and Hard Gamma-Ray Spectra in Flaring TeV Blazars: 1ES 0414+009 and 1ES 1959+650

Samuel Victor Bernardo da Silva; Luiz Augusto Stuani Pereira; Rita de Cássia dos Anjos. Bethe-Heitler Cascades and Hard Gamma-Ray Spectra in Flaring TeV Blazars: 1ES 0414+009 and 1ES 1959+650. 2025. Read paper

Prospects for Gamma-Ray Emission from Magnetar Regions in CTAO Observations

M. F. Sousa; R. Costa, Jr.; Jaziel G. Coelho; R. C. Dos Anjos. Prospects for Gamma-Ray Emission from Magnetar Regions in CTAO Observations. The Astrophysical Journal, 2025. Read paper

4D Embedded Rotating Black Hole as a Particle Accelerator in the Presence of Magnetic Fields

Abraão J. S. Capistrano; Carlos Henrique Coimbra-Araújo; Rita de Cássia dos Anjos. 4D Embedded Rotating Black Hole as a Particle Accelerator in the Presence of Magnetic Fields. Universe, 2024. Read paper

Estudo de deflexões de UHECR na presença do campo magnético galáctico JF2012

Larissa Cristina Santos; Rita de Cássia dos Anjos. Estudo de deflexões de UHECR na presença do campo magnético galáctico JF2012. Cadernos de Astronomia, 2024. Read paper

A gamma-ray study of galactic PeVatron candidates LHAASO J1825-1326 and LHAASO J1839-0545

Rubens Jr. Costa, Jr.; Debora B. Götz; Rita C. Anjos; Luiz A. Stuani Pereira et al.. A gamma-ray study of galactic PeVatron candidates LHAASO J1825-1326 and LHAASO J1839-0545. Journal of Cosmology and Astroparticle Physics, 2024. Read paper

Binary Coalescences as Sources of Ultrahigh-Energy Cosmic Rays

Jonas P. Pereira; Carlos H. Coimbra-Araújo; Rita C. dos Anjos; Jaziel G. Coelho. Binary Coalescences as Sources of Ultrahigh-Energy Cosmic Rays. Physical Review Letters, 2024. Read paper

Challenges of This Century in High-Density Compact Objects, High-Energy Astrophysics, and Multi-Messenger Observations: Quo Vadis?

Jaziel G. Coelho; Rita. C. Dos Anjos. Challenges of This Century in High-Density Compact Objects, High-Energy Astrophysics, and Multi-Messenger Observations: Quo Vadis?. Galaxies, 2023. Read paper

Ultra-High-Energy Particles at the Border of Kerr Black Holes Triggered by Magnetocentrifugal Winds

Carlos H. Coimbra-Araújo; Rita C. dos Anjos. Ultra-High-Energy Particles at the Border of Kerr Black Holes Triggered by Magnetocentrifugal Winds. Galaxies, 2022. Read paper

Sensitivity of Cross-Correlation Studies by Using Xmax Information

Cynthia V. Ventura; Rogerio M. de Almeida; Rita C. Dos Anjos; Jaziel G. Coelho. Sensitivity of Cross-Correlation Studies by Using Xmax Information. Galaxies, 2022. Read paper

Sensitivity of Cross-Correlation Studies by Using Xmax Information

Cynthia V. Ventura; Rogerio M. de Almeida; Rita C. Dos Anjos; Jaziel G. Coelho. Sensitivity of Cross-Correlation Studies by Using Xmax Information. Galaxies, 2022. Read paper

Deep-learning based reconstruction of the shower maximum X max using the water-Cherenkov detectors of the Pierre Auger Observatory

Deep-learning based reconstruction of the shower maximum X max using the water-Cherenkov detectors of the Pierre Auger Observatory. Journal of Instrumentation, 2021. Read paper

Design and implementation of the AMIGA embedded system for data acquisition

Design and implementation of the AMIGA embedded system for data acquisition. Journal of Instrumentation, 2021. Read paper

Extraction of the muon signals recorded with the surface detector of the Pierre Auger Observatory using recurrent neural networks

Extraction of the muon signals recorded with the surface detector of the Pierre Auger Observatory using recurrent neural networks. Journal of Instrumentation, 2021. Read paper

The FRAM robotic telescope for atmospheric monitoring at the Pierre Auger Observatory

The FRAM robotic telescope for atmospheric monitoring at the Pierre Auger Observatory. Journal of Instrumentation, 2021. Read paper

Acceleration of charged particles from near-extremal rotating black holes embedded in magnetic fields

C H Coimbra-Araújo; R C Anjos. Acceleration of charged particles from near-extremal rotating black holes embedded in magnetic fields. Classical and Quantum Gravity, 2021. Read paper

Galactic Center as an efficient source of cosmic rays

Rita. C. Anjos; Fernando Catalani. Galactic Center as an efficient source of cosmic rays. Physical Review D, 2020. Read paper

Measurement of the average shape of longitudinal profiles of cosmic-ray air showers at the Pierre Auger Observatory

Measurement of the average shape of longitudinal profiles of cosmic-ray air showers at the Pierre Auger Observatory. Journal of Cosmology and Astroparticle Physics, 2019. Read paper

An Indication of Anisotropy in Arrival Directions of Ultra-high-energy Cosmic Rays through Comparison to the Flux Pattern of Extragalactic Gamma-Ray Sources

An Indication of Anisotropy in Arrival Directions of Ultra-high-energy Cosmic Rays through Comparison to the Flux Pattern of Extragalactic Gamma-Ray Sources. The Astrophysical Journal, 2018. Read paper

The influence of the observatory latitude on the study of ultra high energy cosmic rays

Rita C. dos Anjos; Vitor de Souza; Rogerio M. de Almeida; Edivaldo M. Santos. The influence of the observatory latitude on the study of ultra high energy cosmic rays. Journal of Cosmology and Astroparticle Physics, 2017. Read paper

PRÁTICAS DE FÍSICA NA FORMAÇÃO CONTINUADA DOS PROFESSORES DA REDE PÚBLICA DE PALOTINA E REGIÃO

Rita De Cássia Dos Anjos; Camila Tonezer. PRÁTICAS DE FÍSICA NA FORMAÇÃO CONTINUADA DOS PROFESSORES DA REDE PÚBLICA DE PALOTINA E REGIÃO. Extensão em Foco, 2017. Read paper

A Targeted Search for Point Sources of EeV Photons with the Pierre Auger Observatory

Aab, A.; Abreu, P.; Aglietta, M.; Samarai, I.Al. et al.. A Targeted Search for Point Sources of EeV Photons with the Pierre Auger Observatory. Astrophysical Journal Letters, 2017. Read paper

Calibration of the logarithmic-periodic dipole antenna (LPDA) radio stations at the Pierre Auger Observatory using an octocopter

Calibration of the logarithmic-periodic dipole antenna (LPDA) radio stations at the Pierre Auger Observatory using an octocopter. Journal of Instrumentation, 2017.

Central accumulation of magnetic flux in massive Seyfert galaxies as a possible engine to trigger ultrahigh energy cosmic rays

Anjos, R.C.; Coimbra-Araújo, C.H.. Central accumulation of magnetic flux in massive Seyfert galaxies as a possible engine to trigger ultrahigh energy cosmic rays. Physical Review D, 2017. Read paper

Combined fit of spectrum and composition data as measured by the Pierre Auger Observatory

Aab, A.; Abreu, P.; Aglietta, M.; Samarai, I.A. et al.. Combined fit of spectrum and composition data as measured by the Pierre Auger Observatory. Journal of Cosmology and Astroparticle Physics, 2017. Read paper

Estimative of conversion fractions of AGN magnetic luminosity to produce ultra high energy cosmic rays from the observation of Fermi-LAT gamma rays

Coimbra-Araújo, C.H.; Anjos, R.C.. Estimative of conversion fractions of AGN magnetic luminosity to produce ultra high energy cosmic rays from the observation of Fermi-LAT gamma rays. AIP Conference Proceedings, 2017. Read paper

Multi-messenger Observations of a Binary Neutron Star Merger

Multi-messenger Observations of a Binary Neutron Star Merger. The Astrophysical Journal Letters, 2017.

Multi-resolution anisotropy studies of ultrahigh-energy cosmic rays detected at the Pierre Auger Observatory

Aab, A.; Abreu, P.; Aglietta, M.; Al Samarai, I. et al.. Multi-resolution anisotropy studies of ultrahigh-energy cosmic rays detected at the Pierre Auger Observatory. Journal of Cosmology and Astroparticle Physics, 2017. Read paper

Muon counting using silicon photomultipliers in the AMIGA detector of the Pierre Auger observatory

Aab, A.; Abreu, P.; Aglietta, M.; Ahn, E.J. et al.. Muon counting using silicon photomultipliers in the AMIGA detector of the Pierre Auger observatory. Journal of Instrumentation, 2017. Read paper

Search for High-energy Neutrinos from Binary Neutron Star Merger GW170817 with ANTARES, IceCube, and the Pierre Auger Observatory

Search for High-energy Neutrinos from Binary Neutron Star Merger GW170817 with ANTARES, IceCube, and the Pierre Auger Observatory. The Astrophysical Journal Letters, 2017.

Search for photons with energies above 1018 eV using the hybrid detector of the Pierre Auger Observatory

Aab, A.; Abreu, P.; Aglietta, M.; Al Samarai, I. et al.. Search for photons with energies above 1018 eV using the hybrid detector of the Pierre Auger Observatory. Journal of Cosmology and Astroparticle Physics, 2017. Read paper

Analytical Solutions of the Fokker–Planck Equation for Generalized Morse and Hulthén Potentials

Anjos, R.C.; Freitas, G.B.; Coimbra-Araújo, C.H.. Analytical Solutions of the Fokker–Planck Equation for Generalized Morse and Hulthén Potentials. Journal of Statistical Physics, 2016. Read paper

Azimuthal asymmetry in the risetime of the surface detector signals of the Pierre Auger Observatory

Aab, A.; Abreu, P.; Aglietta, M.; Ahn, E.J. et al.. Azimuthal asymmetry in the risetime of the surface detector signals of the Pierre Auger Observatory. Physical Review D - Particles, Fields, Gravitation and Cosmology, 2016. Read paper

Energy estimation of cosmic rays with the Engineering Radio Array of the Pierre Auger Observatory

Aab, A.; Abreu, P.; Aglietta, M.; Ahn, E.J. et al.. Energy estimation of cosmic rays with the Engineering Radio Array of the Pierre Auger Observatory. Physical Review D, 2016. Read paper

Evidence for a mixed mass composition at the ‘ankle’ in the cosmic-ray spectrum

Aab, A.; Abreu, P.; Aglietta, M.; Ahn, E.J. et al.. Evidence for a mixed mass composition at the ‘ankle’ in the cosmic-ray spectrum. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2016. Read paper

Measurement of the Radiation Energy in the Radio Signal of Extensive Air Showers as a Universal Estimator of Cosmic-Ray Energy

Aab, A.; Abreu, P.; Aglietta, M.; Ahn, E.J. et al.. Measurement of the Radiation Energy in the Radio Signal of Extensive Air Showers as a Universal Estimator of Cosmic-Ray Energy. Physical Review Letters, 2016. Read paper

Nanosecond-level time synchronization of autonomous radio detector stations for extensive air showers

Aab, A.; Abreu, P.; Aglietta, M.; Ahn, E.J. et al.. Nanosecond-level time synchronization of autonomous radio detector stations for extensive air showers. Journal of Instrumentation, 2016. Read paper

Producing ultra high energy cosmic rays from AGN magnetic luminosity

Coimbra-Araújo, C.H.; Anjos, R.C.. Producing ultra high energy cosmic rays from AGN magnetic luminosity. Proceedings of the International Astronomical Union, 2016. Read paper

Prototype muon detectors for the AMIGA component of the Pierre Auger Observatory

Aab, A.; Abreu, P.; Aglietta, M.; Ahn, E.J. et al.. Prototype muon detectors for the AMIGA component of the Pierre Auger Observatory. Journal of Instrumentation, 2016. Read paper

Search for correlations between the arrival directions of IceCube neutrino events and ultrahigh-energy cosmic rays detected by the Pierre Auger Observatory and the Telescope Array

Aartsen, M.G.; Abraham, K.; Ackermann, M.; Adams, J. et al.. Search for correlations between the arrival directions of IceCube neutrino events and ultrahigh-energy cosmic rays detected by the Pierre Auger Observatory and the Telescope Array. Journal of Cosmology and Astroparticle Physics, 2016. Read paper

Search for ultrarelativistic magnetic monopoles with the Pierre Auger observatory

Aab, A.; Abreu, P.; Aglietta, M.; Al Samarai, I. et al.. Search for ultrarelativistic magnetic monopoles with the Pierre Auger observatory. Physical Review D, 2016. Read paper

Stability of perturbed geodesics in nD axisymmetric spacetimes

Coimbra-Araújo, C.H.; Anjos, R.C.. Stability of perturbed geodesics in nD axisymmetric spacetimes. Classical and Quantum Gravity, 2016. Read paper

Testing Hadronic Interactions at Ultrahigh Energies with Air Showers Measured by the Pierre Auger Observatory

Aab, A.; Abreu, P.; Aglietta, M.; Ahn, E.J. et al.. Testing Hadronic Interactions at Ultrahigh Energies with Air Showers Measured by the Pierre Auger Observatory. Physical Review Letters, 2016. Read paper

Ultra high energy cosmic rays and possible signature of black strings

Anjos, R.C.D.; Coimbra-Araújo, C.H.; Rocha, R.D.; De Souza, V.. Ultra high energy cosmic rays and possible signature of black strings. Journal of Cosmology and Astroparticle Physics, 2016. Read paper

Ultrahigh-energy neutrino follow-up of gravitational wave events GW150914 and GW151226 with the Pierre Auger Observatory

Aab, A.; Abreu, P.; Aglietta, M.; Al Samarai, I. et al.. Ultrahigh-energy neutrino follow-up of gravitational wave events GW150914 and GW151226 with the Pierre Auger Observatory. Physical Review D, 2016. Read paper

Estudo da equação de Fokker-Planck para os potenciais de Hulthén e de Morse generalizado via supersimetria

Rita De Cassia dos Anjos; Gisele Bosso de Freitas. Estudo da equação de Fokker-Planck para os potenciais de Hulthén e de Morse generalizado via supersimetria. 2015. Read paper

Luminosity of ultrahigh energy cosmic rays and bounds on magnetic luminosity of radio-loud active galactic nuclei

Coimbra-Araújo, C.H.; Anjos, R.C.. Luminosity of ultrahigh energy cosmic rays and bounds on magnetic luminosity of radio-loud active galactic nuclei. Physical Review D - Particles, Fields, Gravitation and Cosmology, 2015. Read paper

Upper limits on the total cosmic-ray luminosity of individual sources

Anjos, R.C.; De Souza, V.; Supanitsky, A.D.. Upper limits on the total cosmic-ray luminosity of individual sources. Journal of Cosmology and Astroparticle Physics, 2014. Read paper

General structures of Hamiltonian hierarchies

Dos Anjos, R.C.; Drigo Filho, E.; Ricotta, R.M.. General structures of Hamiltonian hierarchies. Journal of Physics: Conference Series, 2008. Read paper

Hamiltonian hierarchy of pseudo-potentials

Rita de Cassia dos Anjos; Elso Drigo Filho; Regina Maria Ricotta. Hamiltonian hierarchy of pseudo-potentials. Physica Scripta, 2007. Read paper

Propagação de raios cósmicos extragaláticos

Rita de Cássia dos Anjos. Propagação de raios cósmicos extragaláticos. n.d.. Read paper

Teorias de campos integráveis e sólitons

Rita de Cássia dos Anjos. Teorias de campos integráveis e sólitons. n.d.. Read paper

Full lists: ORCID · Google Scholar · CV Lattes