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Nuclear Physics Division


Institute of Research into the Fundamental Laws of the Universe
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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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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ESA adopts LISA mission
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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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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The US Department of Energy (DOE) and the CEA sign a
Coffee, Epidemics and Nuclear Reactors
Jul 30, 2023
Coffee, Epidemics and Nuclear Reactors
May 30, 2023
Mapping the configuration of neutrons in the nuclear halo
The final piece of a longstanding adventure started in 2014 with an experiment led by Irfu and RIKEN Nishina Center has been set with the publication of a paper containing the comparative study of dineutron correlation in 11Li, 14Be and 17B [1]. This paper published in Phys. Lett.
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Mapping the configuration of neutrons in the nuclear halo
Ab initio description of collective excitations in doubly open-shell nuclei
Apr 13, 2023
Ab initio description of collective excitations in doubly open-shell nuclei
Prediction of nuclear properties based on a realistic description of the strong interaction is the main quest of low-energy nuclear theory. One of the issues lies is the cost of solving Schrödinger’s equation that scales exponentially with the number of nucleons.
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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?
First experience with FALSTAFF at NFS
Jan 16, 2023
First experience with FALSTAFF at NFS
After several years of development at Saclay, the first part of the Falstaff spectrometer was moved to GANIL in 2021 and then installed on NFS for the study of uranium 235. The experiment that took place in November and December 2022 was the first to use an actinide target on SPIRAL2. It demonstrated the good performance of this device.
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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The Stereo adventure has not been sterile
A model for the heart of the nucleon
Dec 13, 2022
A model for the heart of the nucleon
Nucleons (protons or neutrons) are the constituents of the nucleus of atoms. The exploration of their internal structure is traditionally done by determining "form factors".
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Nov 07, 2022
Imaging nuclei with relativistic ion collisions
A new window into the deformation of nuclei has been recently opened with the realisation that nuclear collision experiments performed at high-energy colliders, such as the BNL Relativistic Heavy Ion Collider (RHIC) or the CERN Large Hadron Collider (LHC), give access to the shape of the colliding isotopes.
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Imaging nuclei with relativistic ion collisions
First measurement of the pygmy resonance using neutron inelastic scattering reaction at GANIL-SPIRAL2 NFS
Oct 13, 2022
First measurement of the pygmy resonance using neutron inelastic scattering reaction at GANIL-SPIRAL2 NFS
The pygmy dipole resonance (PDR) is a vibrational mode of the nucleus that occurs in neutron-rich nuclei. It is described as the oscillation of a neutron skin against a core symmetric in number of protons and neutrons (Figure 1). The PDR has been the subject of numerous studies, both experimental and theoretical.
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Sep 22, 2022
First harvest from Cocotier
The first measurement of Short-Range Correlations (SRC) in an exotic nucleus took place in May 2022 with the Cocotier instrument at the GSI facility in Darmstadt, Germany.
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First harvest from Cocotier
Study of neutron capture gammas from uranium isotopes
Jun 17, 2022
Study of neutron capture gammas from uranium isotopes
The DPhN, in collaboration with the Department of Reactor Studies of Cadarache (DES) and the Institute of Particle and Nuclear Physics of Charles University in Prague (Czech Republic), studied the properties of gamma rays emitted by uranium isotopes during neutron capture reactions.
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Mar 03, 2022
Tests of a high power Beryllium (Be) target and first neutron diffraction measurements on the IPHI-neutron source
The objective of the realization of efficient compact neutron sources is to make it possible to perform neutron scattering experiments, with practically the same qualities as those carried out with neutron beam lines from research reactors of the Orphée type*.
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Tests of a high power Beryllium (Be) target and first neutron diffraction measurements on the IPHI-neutron source
A glimpse of nuclear couple through transparent nuclei
Jun 24, 2021
A glimpse of nuclear couple through transparent nuclei
DPhN physicists have played a decisive role in the first measurement of pairs of nucleons using a new method, that will pave the way to the study of short range interactions in radioactive nuclei.
Nucleons are social particles. Not only do they enjoy living in communities inside nuclei, but they also form couples within these communities. Indeed, one can observe protons and neutrons forming pairs inside nuclei.
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Jun 04, 2021
GLAD and COCOTIER : IRFU cryogenics at GSI
Two state-of-the-art instruments, GLAD and COCOTIER, were designed and built at Irfu in the last few years and are now operational in the R3B experimental room of the GSI heavy ion accelerator (Darmstadt, Germany). Both are intended to be part of the equipment that will be used at FAIR, the new machine under construction at the GSI site.
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GLAD and COCOTIER : IRFU cryogenics at GSI
Which ruler to measure the size of the proton?
May 25, 2021
Which ruler to measure the size of the proton?
Since 2010 the question of the size of the proton is at the heart of a controversy between atomic physicists and hadronic physicists. Indeed, very precise measurements of atomic physics have concluded that the size of the proton is much smaller than expected, in very strong disagreement with the experiments of elastic scattering.
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May 19, 2021
SIRIUS, the faithful companion of S3
IRFU engineers and physicists and their collaborators have just completed the development of a modern Sirius, a key element of the super spectrometer separator (S3) under construction at GANIL.
The ancients understood that heroes, like Orion with Sirius, need their faithful companion. IRFU engineers and physicists and their collaborators are no exception to the rule and have just completed the development of a modern Sirius, a key element of the super spectrometer separator (S3) under construction at GANIL.
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SIRIUS, the faithful companion of S3
A distorting nuclear mirror
Apr 14, 2021
A distorting nuclear mirror
Two “mirror” nuclei, in which the numbers of neutrons and protons are interchanged, have markedly different shapes—a finding that defies current nuclear theories.
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Dec 15, 2020
Commissioning of the "Neutrons For Science" facility at GANIL
In December 2019, the NFS (Neutrons For Science) facility received its first proton beams, delivered by the linear accelerator of the new Spiral2 facility at the GANIL. On the fringes of the progressive commissioning of the accelerator in 2020, short beam periods were used to successfully test several NFS components.
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Commissioning of the
In search of gravitational wave signatures
Dec 08, 2020
In search of gravitational wave signatures
In 2016, the announcement of the first direct detection of gravitational waves opened a new window of observation to probe our universe in a new way.
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Aug 20, 2020
Investigation in the mendelevium - lawrencium family: true or false twins?
The spectroscopy of a mendelevium isotope, 251Md composed of 101 protons and 150 neutrons, reveals a surprise: when it rotates, it behaves exactly like a lawrencium isotope made of 103 protons and 152 neutrons.
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Investigation in the mendelevium - lawrencium family: true or false twins?
INCL, a key to deciphering the history of meteorites
Jul 23, 2020
INCL, a key to deciphering the history of meteorites
Meteorites are bombarded throughout their journey by cosmic radiation. This cosmic ray exposure (CRE) is a formidable footprint of their history, provided of course that we know how to decipher it.
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Jul 21, 2020
The balance of tin
The combination of the AGATA multi-detector [right] and the VAMOS spectrometer [left] showed that the balance between the two contributions was more complex than previously envisaged.
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The balance of tin
CERN's ALICE collaboration reports new results on a charming messenger of quarks and gluon plasma
Jul 02, 2020
CERN's ALICE collaboration reports new results on a charming messenger of quarks and gluon plasma
The 2020 edition of the Large Hadron Collider Physics Conference (LHCP) took place from 25 to 30 May 2020. Due to the COVID-19 pandemic, the conference, originally planned to be hosted in Paris, was held entirely online.
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Jun 08, 2020
Chips on a ladder: end of production for ALICE-MFT
After more than four years of research and development, design and manufacturing work, the MFT (Muon Forward Tracker), a new detector that will equip the ALICE experiment at the LHC, has seen its construction finalized and is currently under commissioning at CERN.
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Chips on a ladder: end of production for ALICE-MFT
Measuring proton and neutron polarization beyond limits
Apr 29, 2020
Measuring proton and neutron polarization beyond limits
Nucleons (protons and neutrons), the components of the atomic nucleus, can be polarized. This means that their spins are preferentially aligned along a quantization axis. The spin is a quantum property of a particle and has its classical analogue in a spinning top.
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Mar 10, 2020
The strange version of INCL
INCL (Liège intranuclear cascade) is a simulation code known for its ability to model light particle-nucleus interactions. It is used in very various fields, such as proton therapy, neutron sources, radioactive ion beams or ADS's (Accelerator Driven Systems).
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The strange version of INCL

 

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