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Nuclear Physics Division


Institute of Research into the Fundamental Laws of the Universe
« The Nuclear Physics Division 
Researchers use the James Webb to map the weather on a planet 280 light-years away
May 03, 2024
Researchers use the James Webb to map the weather on a planet 280 light-years away
An international team of researchers, including members from CEA, utilized NASA's James Webb Space Telescope to map the weather of the hot gas giant WASP-43 b.
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Mar 28, 2024
First numerical simulations of a new magnetar-forming mechanism
Magnetars are neutron stars displaying the most intense magnetic fields observed in the Universe.
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First numerical simulations of a new magnetar-forming mechanism
Tiniest “starquakes” ever detected
Mar 27, 2024
Tiniest “starquakes” ever detected
An international team, including the Astrophysics Department of CEA-Saclay, led by the Instituto de Astrofísica e Ciências do Espaço (IA), utilized one of the world's most advanced spectrographs to detect the smallest "stellar tremors" ever recorded in an orange dwarf star, making it the smallest and coldest star observed to date with confirmed solar oscillations.
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Mar 20, 2024
Operations begin to de-ice Euclid’s vision
UPDATE [03/26/2024]: The optics de-icing procedure has been a success!
UPDATE [03/26/2024]: Euclid's optics de-icing procedure has produced much better results than expected. The main suspect in the blurred vision of Euclid's VIS instrument was the coldest mirror behind the telescope's main optics.
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Operations begin to de-ice Euclid’s vision
The 2024 Fritz Zwicky Prize for Astrophysics & Cosmology is awarded to Dr Catherine Cesarsky
Mar 05, 2024
The 2024 Fritz Zwicky Prize for Astrophysics & Cosmology is awarded to Dr Catherine Cesarsky
After being awarded the 2020 Tate Prize for International Leadership in Physics, astrophysicist Dr.
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Feb 28, 2024
Newton and Euclid are converging towards the Furnace
XMM-Newton's energetic universe joins forces with the Euclid satellite's vision of the sky. A thousand hours of X-ray observations, over a region 40 times the size of the moon, will complement multi-wavelength studies of the cosmic evolution of galaxy clusters.
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Newton and Euclid are converging towards the Furnace
Sara Bolognesi, physicist at Irfu, receives the CNRS silver medal for the 2024 prize list
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. This medal rewards researchers for the originality, quality and importance of their work, which is recognised internationally and contributes to the reputation of French research. 
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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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.
Observation of the unstable oxygen-28 nucleus
Feb 08, 2024
Observation of the unstable oxygen-28 nucleus
Exotic, very neutron-rich nuclei: a laboratory for nuclear interactions
For the first time, an experiment has provided key observations on the spectroscopy of the neutron-rich unbound oxygen nuclei (proton number Z = 8), oxygen 28 (N = 20) and its neighboring isotope at N = 19, oxygen 27.
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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
MIRI confirms the presence of sulfur dioxide in the atmosphere of WASP-39b
The James Webb Space Telescope has produced a new portrait of the atmosphere of exoplanet WASP-39b, a "hot Saturn" some 700 light-years away.
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MIRI confirms the presence of sulfur dioxide in the atmosphere of WASP-39b
Modeling reactor antineutrino spectra: a major step forward!
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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Jan 17, 2024
Lack of planets near fast-rotating stars: observational bias or physical cause?
To unravel this mystery, several teams with diverse skills from the Astrophysics Department had to come together, as the architecture that unites the star to its planet is highly complex.
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Lack of planets near fast-rotating stars: observational bias or physical cause?
ATHENA mission back on track!
Dec 21, 2023
ATHENA mission back on track!
NewAthena, a pioneering X-ray observatory, will enable us to make major scientific progress in our understanding of the hot and energetic universe.
On November 8, 2023, ESA's Science Program Committee (SPC) approved the evolution of the Athena (Advanced Telescope for High-Energy Astrophysics) mission, now named NewAthena, and confirmed its status as the flagship mission of ESA's Cosmic Vision program.
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Dec 18, 2023
Barbara Perri receives ANR grant for her WindTRUST project to study space weather
Barbara Perri, an astrophysicist at Irfu's Astrophysics Department and an expert in space weather, has been awarded an ANR contract for the WindTRUST project, which aims to predict solar activity in order to protect against it.
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Barbara Perri receives ANR grant for her WindTRUST project to study space weather
8 December 2023: Inauguration of the PEPR Suprafusion project
Dec 08, 2023
8 December 2023: Inauguration of the PEPR Suprafusion project
The PEPR Suprafusion, proposed by the CEA and the CNRS, is the winner of the third wave of calls for
The PEPR Suprafusion (Priority Equipment Programme for Exploratory Research), proposed by CEA and CNRS, is the winner of the third wave of calls for projects under the France 2030 plan.
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Dec 06, 2023
The EPICS community document-athon
Engineers from Irfu's Division of Systems Engineering (DIS), co-managers of several EPICS sub-projects, took part in a particularly rewarding "Document-athon" experience, both technically and humanely. EPICS is a collection of open-source software tools for managing the control-system part of an experiment.
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The EPICS community document-athon
The Fermi telescope's third catalog of gamma-ray pulsars
Nov 27, 2023
The Fermi telescope's third catalog of gamma-ray pulsars
The majority of the 3400 known pulsars are "seen" in radio waves, and are located in the Milky Way. The 340 pulsars seen in gamma-rays all share the common feature of being among the 10-15% most powerful pulsars.
An international team led by French researchers, including those at DAp, publishes on November 28, 2023 in the Astrophysical Journal a compilation of 340 pulsars seen in gamma rays (30 MeV - 30 GeV) with the LAT space telescope on NASA's Fermi satellite. Prior to Fermi's launch in 2008, only 11 pulsars were known in gamma rays.
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Nov 27, 2023
SARAF: two IRFU successes in 2023!
IRFU successfully qualified the medium-energy line delivered to Soreq in 2020 after just a few hundred hours of beam, and delivered the first cryomodule for the future linear accelerator.
Thanks to the expertise developed by the CEA during the SPIRAL2 and IFMIF projects, in 2014 the CEA signed a contract with the Soreq Nuclear Research Centre (SNRC, Israel) to build a superconducting linear accelerator called SARAF (Soreq Applied Research Accelerator Facility).
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SARAF: two IRFU successes in 2023!
Antoine Strugarek receives an ERC Consolidator grant for his ExoMagnets project, dedicated to characterising the magnetism of exoplanets
Nov 22, 2023
Antoine Strugarek receives an ERC Consolidator grant for his ExoMagnets project, dedicated to characterising the magnetism of exoplanets
ExoMagnets aims to develop new theories and high-performance simulations using future exascale computing infrastructures in order to exploit existing and future observations of the magnetism of distant exoplanets.
Antoine Strugarek, an astrophysicist in Irfu's Astrophysics Department, has been awarded an ERC Consolidator contract. The core of his ExoMagnets project is to understand the magnetic coupling between an exoplanet and its star, and therefore the magnetic field of exoplanets, which is crucial for the habitability of a planet.
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Nov 15, 2023
The ammonia trail leads to exoplanets
The consortium of laboratories that has developed the MIRI instrument for the JWST is benefiting from guaranteed observation time. The CEA's Astrophysics Department, which is part of the consortium, has defined and coordinated the exoplanet observation programme.
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The ammonia trail leads to exoplanets
The US Department of Energy (DOE) and the CEA sign a
Nov 15, 2023
The US Department of Energy (DOE) and the CEA sign a "statement of interest" in the EIC project
EIC is a future electron-ion collider at Brookhaven National Laboratory (BNL) that will probe the internal structure of nucleons and nuclei with unprecedented precision.
The CEA and the DOE have a long and fruitful collaboration in many fields, including fusion, high-energy physics and nuclear physics, with ongoing projects bringing the two organisations together in these different areas.
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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. The DPhP group at CEA/IRFU is seeking to solve this mystery by observing the very rare double-beta decay without neutrino emission of the Mo-100 nucleus using scintillating bolometers.
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Two milestones on the road to CUPID
The Webb and its MIRI instrument usher in a new era in the exploration of exoplanet atmospheres!
Nov 15, 2023
The Webb and its MIRI instrument usher in a new era in the exploration of exoplanet atmospheres!
An international team, led by astrophysicists from CEA, has observed the passage of exoplanet Wasp-107b in front of its star, with the aim of characterizing its atmosphere.
An international team of scientists, led by the Astrophysics Department of the CEA, has observed for the first time the swollen atmosphere of the exoplanet WASP-107b in the mid-infrared using the James Webb Space Telescope.
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Nov 08, 2023
The THESEUS mission selected by the European Space Agency
ESA has selected THESEUS, a mission dedicated to the transient and multi-messenger Universe, for a feasibility study for its next medium sized mission. IRFU will play a leading role in this, with the responsibility for the IRT telescope.
ESA has selected the THESEUS (Transient High Energy Sky and Early Universe Surveyor) mission as a medium-sized mission candidate.
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The THESEUS mission selected by the European Space Agency
Euclid's
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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Oct 24, 2023
James Webb: First detection of a 52-proton heavy element from stellar fusion
Study of the second-brightest gamma-ray burst ever observed reveals tellurium, an element rarer than platinum on Earth
An international team of scientists, including a researcher from Irfu's Astrophysics Department, used several space and ground-based telescopes, including the James Webb Space Telescope and the European Southern Observatory's Very Large Telescope, to observe an exceptionally bright gamma-ray burst detected on March 7, 2023, GRB 230307A, and identify the neutron star merger that generated the explosion responsible for the burst.
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James Webb: First detection of a 52-proton heavy element from stellar fusion
Irfu astrophysicist wins 2023 L'Oréal-Unesco Young Talent Award for Women in Science
Oct 10, 2023
Irfu astrophysicist wins 2023 L'Oréal-Unesco Young Talent Award for Women in Science
For the 17th edition of the Prix Jeunes Talents France, the L'Oréal Foundation rewarded 35 brilliant young female researchers in France, selected from 618 eligible applications by a jury of excellence comprising 32 researchers from the French Academy of Sciences.
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Sep 26, 2023
Fermi is 15 years old!
Fermi-LAT telescope continues systematic γ-ray survey NASA's Fermi satellite was launched in June 2008, and the Fermi-LAT telescope has been carrying out a systematic γ-ray survey of near-GeV energies covering most of the sky every 3 hours (and the whole sky in no more than a week) since August 2008.
Fermi is 15 years old!

 

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