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Particle Physics Division


Institute of Research into the Fundamental Laws of the Universe
ATLAS New Small Wheel Micromegas contribute to the endcap muon trigger
Oct 08, 2024
ATLAS New Small Wheel Micromegas contribute to the endcap muon trigger
The New Small Wheels (NSW) are the most important project of the ATLAS Phase-1 upgrade towards the High-Luminosity LHC. IRFU has been heavily involved in the design, construction, integration, commissioning and operations of the NSW.
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Jul 19, 2024
Announcing the Tilepy Platform: Multi-Messenger Astrophysics at your fingertips
Tilepy is a cutting-edge platform designed to optimize and facilitate the scheduling of follow-up observations of multi-messenger events[1].
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Announcing the Tilepy Platform: Multi-Messenger Astrophysics at your fingertips
NectarCAM plays ping-pong with gamma rays
May 30, 2024
NectarCAM plays ping-pong with gamma rays
The NECTAr chip, developed at IRFU and at the heart of the NectarCAM camera's eyes, is capable of operating in ‘ping-pong mode
In the quest to unravel the mysteries of the Universe, astrophysicists and engineers are pushing the boundaries of technology to capture the fleeting signals of cosmic events.
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Feb 15, 2024
Sara Bolognesi, physicist at Irfu, receives the CNRS silver medal for the 2024 prize list
Sara Bolognesi, a physicist in Irfu's particle physics department, has been awarded the CNRS 2024 silver medal in the particle physics speciality.
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Sara Bolognesi, physicist at Irfu, receives the CNRS silver medal for the 2024 prize list
Gautier Hamel de Monchenault, a physicist in the particle physics department at CEA-IRFU, has just been elected as the tenth spokesperson for the CMS collaboration at CERN.
Feb 12, 2024
Gautier Hamel de Monchenault, a physicist in the particle physics department at CEA-IRFU, has just been elected as the tenth spokesperson for the CMS collaboration at CERN.
With more than 5,000 scientists, engineers, technicians, administrators and students, CMS is one of the largest scientific collaborations in the world.
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Feb 02, 2024
T2K on the trail of the missing antimatter in the universe: act two!
On January 17, the T2K collaboration announced the launch of the second phase of its experiment, as stated in a press release. This phase will exploit an upgrade of the beam, whose nominal power has been increased from 450 kW to 710 kW, with the aim of reaching 1.2 MW by 2027.
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T2K on the trail of the missing antimatter in the universe: act two!
ESA adopts LISA mission
Jan 25, 2024
ESA adopts LISA mission
ESA's Scientific Program Committee has adopted the LISA mission, giving the go-ahead for construction of the instrument and satellites. For the first time, LISA will observe the Universe through gravitational waves from space.
ISA (Laser Interferometer Space Antenna), the European Space Agency's large-scale mission to explore the Universe by observing the many sources of gravitational waves, was adopted on Thursday January 25 by ESA's Scientific Programs Committee, meaning that the concept and technology are recognized as sufficiently advanced for construction of the instrument and satellites to begin.
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Jan 22, 2024
Modeling reactor antineutrino spectra: a major step forward!
A comprehensive revision of the summation method lays new and solid foundations for the calculation of antineutrino spectra emitted by a nuclear reactor. This major advance sheds new light on the origin of the reactor antineutrino anomalies, and will be
Supported by CEA's "digital simulation" cross-disciplinary program, Irfu, the Laboratoire National Henri Becquerel of DRT and the Service d'Étude des Réacteurs et de Mathématiques Appliquées of DES teamed up to carry out a thorough review of calculations of antineutrino spectra from nuclear reactors.
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Modeling reactor antineutrino spectra: a major step forward!
Two milestones on the road to CUPID
Nov 15, 2023
Two milestones on the road to CUPID
The collaboration has finalised a detailed background model offering the lowest index ever obtained, and has also adopted a new technology: NTL light detectors, which are much more effective at rejecting background noise.
Neutrino oscillations have confirmed that these mysterious particles have mass, contradicting the predictions of the Standard Model.
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Nov 07, 2023
Euclid's "Early Release Observations", portraits of the Universe like no other!
This series of five images demonstrates the satellite's exceptional performance for its cosmological mission!
To reveal the influence of the dark components of the Universe, over the next six years Euclid will be observing the shapes, distances and movements of billions of galaxies.
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Euclid's
A new quantum model of diffraction
Jul 24, 2023
A new quantum model of diffraction
A model based on the concept of quantum measurement provides a new approach to calculate diffraction. The predictions of wave optics and the quantum model are significantly different at large angles.
A scientist from IRFU published an article in the Physical Review A presenting a diffraction model based on the concept of quantum measurement [1]. This model represents a new approach because the amplitude of the diffracted wave is usually calculated using classical methods of wave optics.
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Jun 28, 2023
GBAR joins the anti-club!
The GBAR collaboration, to which the IRFU makes a major contribution, presented the results of its first data collection at CERN at the end of 2022 at the Moriond conferences in March 2023.
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GBAR joins the anti-club!
DESI collaboration publishes observational data on nearly two million astrophysical objects
Jun 12, 2023
DESI collaboration publishes observational data on nearly two million astrophysical objects
To study dark energy, the large Dark Energy Spectroscopic Instrument (DESI) will map over 40 million galaxies. Today, DESI has released its first data and is publishing 15 papers on the scientific study of these data.
The Universe is immensely big, and getting bigger all the time. To study dark energy, the mysterious force behind the accelerating expansion of our Universe, scientists are using the large Dark Energy Spectroscopic Instrument (DESI) survey to map over 40 million galaxies, quasars and stars.
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May 11, 2023
Could the GRB221009A burst of October 9, 2022 be the most violent starburst of our millennium?
On October 9, 2022, at 13:16 and 59.99 seconds, a gamma-ray burst (GRB) dazzled almost all the X-ray and gamma ray detectors available at the time. Since their discovery, multi-wavelength telescopes in space and on the ground have continuously monitored these events.
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Could the GRB221009A burst of October 9, 2022 be the most violent starburst of our millennium?
ATLAS observes for the first time the production of 4 top quarks
Mar 24, 2023
ATLAS observes for the first time the production of 4 top quarks
The ATLAS collaboration announced at the Moriond conference the observation of simultaneous production of four top quarks. This is one of the rarest and heaviest processes ever observed at the Large Hadron Collider (LHC).
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Jan 23, 2023
The origin of the reactor antineutrino anomalies revealed?
Reactor antineutrino anomalies are a decade-long puzzle in neutrino physics. They are manifested by deviations of the order of a few percent between measurements and predictions.
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The origin of the reactor antineutrino anomalies revealed?
The Stereo adventure has not been sterile
Jan 12, 2023
The Stereo adventure has not been sterile
The final results of the Stereo experiment have just been published in the journal Nature. A record of precision is established for the spectrum of neutrinos emitted by the fission of 235U, measured between 9 and 11m distance from the ILL reactor core in Grenoble.
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Nov 28, 2022
Anastasiia Zolotarova receives an ERC Starting Grant for her project TINY
The European Research Council has just announced the names of the winners of the Starting Grant. This 2022 edition rewards three CEA researchers for their work in the fields of neuroscience, particle physics and physics of matter.
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Anastasiia Zolotarova receives an ERC Starting Grant for her project TINY
The Higgs boson has some self-love
Jul 22, 2022
The Higgs boson has some self-love
The discovery of the Higgs boson in 2012 by the ATLAS and CMS experiments at CERN opened a phase of precision measurements of the properties of the Higgs boson, the keystone of the Standard Model (SM) of particle physics.
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Jul 02, 2022
Mini-bangs in KATRIN to explore the big one!
The analysis on data recorded in 2019, led by an IRFU physicist, on relic neutrinos improves on previous limits by two orders of magnitude.
The cosmic background neutrino is one of the predictions of the standard cosmological model, but it has never been directly observed. These so-called "relic neutrinos" could be captured on a radioactive nucleus like tritium.
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Mini-bangs in KATRIN to explore the big one!
KATRIN steps up efforts in the search for the sterile neutrino
May 03, 2022
KATRIN steps up efforts in the search for the sterile neutrino
The KATRIN collaboration has just recently reported a new upper limit of 0.8 eV/c2 on the mass of neutrinos. The KATRIN spectrometer also has a strong potential to search for new, so-called "sterile" neutrinos, based on a fine analysis of the tritium beta decay spectrum.
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Apr 11, 2022
The ANTARES adventure
On February 12, 2022, the ANTARES neutrino telescope (Astronomy with a Neutrino Telescope and Abyss environmental RESearch) put an end to its data taking started in 2007.
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The ANTARES adventure
H.E.S.S. detects a galactic nova.
Mar 10, 2022
H.E.S.S. detects a galactic nova.
IRFU scientists and the H.E.S.S. collaboration observe time-dependent particle acceleration in our Galaxy for the first time. Novae are powerful eruptions on the surface of a white dwarf in a binary star system, in which a larger star and a smaller star orbit each other.
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Feb 14, 2022
KATRIN experiment breaks new neutrino mass record at less than 0.8 eV
KATRIN has just crossed a symbolic threshold and reveals a new upper limit!
The KATRIN (KArlsruhe TRItium Neutrino Experiment) located at the Karlsruhe Institute of Technology (KIT) has just crossed a symbolic threshold. In a paper published in the prestigious journal Nature Physics, the collaboration reveals a new upper limit of 0.8 eV/c^2 for the mass of neutrinos.
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KATRIN experiment breaks new neutrino mass record at less than 0.8 eV
Retrospective neutrinos 2021: a year full of results and progress!
Feb 10, 2022
Retrospective neutrinos 2021: a year full of results and progress!
At Irfu, neutrino physics is studied using different sources such as reactors, accelerators and radioactive sources.
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Sep 21, 2021
Astro-COLIBRI: a novel platform for real-time multi-messenger astrophysics
After three years of reflection and development, the "Astro-Colibri" application has just been launched. This digital interface, created by researchers at Irfu/DPhP, aims to make information on transient and multi-messenger phenomena easily accessible in real time.
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Astro-COLIBRI: a novel platform for real-time multi-messenger astrophysics
Dark matter sub-halos among unidentified Fermi-LAT Objects-looking for UFOs?
Jul 23, 2021
Dark matter sub-halos among unidentified Fermi-LAT Objects-looking for UFOs?
Space-based experiments such as the Fermi satellite's Large Area (LAT), which detects gamma rays above 100 MeV, reveal a population of sources with no astrophysical counterpart at other wavelengths.
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Jun 28, 2021
ATLAS giants on their way to CERN!
As part of the luminosity increase of the Large Hadron Collider (LHC), the first phase of the ATLAS experiment upgrade is coming to an end, before a restart planned for early 2022.
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ATLAS giants on their way to CERN!
Front-row view reveals exceptional cosmic explosion
Jun 04, 2021
Front-row view reveals exceptional cosmic explosion
On 29 August 2019, scientists from the H.E.S.S. collaboration recorded one of the brightest cosmic explosions ever observed in the Universe. This gamma-ray burst emitted the most energetic photons ever detected in this type of event.
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May 17, 2021
Desi starts its large spectroscopic survey for 5 years
After a particularly successful first campaign of tests and measurements, the Dark Energy Spectroscopic Instrument (DESI) has just successfully started its 5-year observing program.
After a particularly successful first campaign of tests and measurements, the Dark Energy Spectroscopic Instrument (DESI) has just successfully started its 5-year observing program.
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Desi starts its large spectroscopic survey for 5 years

 

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