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Nuclear Physics Division


Institute of Research into the Fundamental Laws of the Universe
« The Nuclear Physics Division 
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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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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Which ruler to measure the size of the proton?
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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Sep 25, 2019
Can we hear the shape of the proton?
It is possible to trace the shape of a drum from its vibration modes. Similarly, it is possible to measure the 3D structure of the proton and access its elementary components, quarks and gluons, from observables obtained using deeply virtual Compton scattering experiments off the proton.
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Can we hear the shape of the proton?
Electron-proton interaction: does the proton see double?
Aug 07, 2019
Electron-proton interaction: does the proton see double?
The series of Jefferson Laboratory (USA) experiments dedicated to the measurement of electron-proton elastic scattering showed that the extracted information on the proton structure did not agree when extracted from two kinds of experiments.
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Nov 07, 2018
The CLAS12 tracker, an IRFU success story
As part of the new CLAS spectrometer project for the 12 GeV electron energy upgrade of the Jefferson Lab (USA) IRFU has been conducting R&D for more than 10 years to design and build a new generation tracker, using thin and flexible MICROMEGAS detectors that are now operating with the new CLAS12 spectrometer.
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The CLAS12 tracker, an IRFU success story
Protons on steroids in neutron stars ?
Aug 31, 2018
Protons on steroids in neutron stars ?
In an article published in August 2018 in the journal Nature [1], the CLAS collaboration of Jefferson Lab (USA) reports an extensive study on short-range correlations between nucleons in different nuclei.
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Jun 04, 2018
New theoretical tools for proton tomography
An important scientific program is devoted to the three-dimensional structure of the proton in particular its elementary constituents, quarks and gluons.
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New theoretical tools for proton tomography
The elusive hint of dark matter
May 04, 2018
The elusive hint of dark matter
A recent theoretical study of the IRFU has overturned a dark matter mechanism claiming to explain the anomaly in the neutron lifetime. Indeed, the strong constraints, extracted from this mechanism, make it impossible to theoretically predict the neutron stars of 2 solar masses whose existence is known.
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Nov 14, 2017
COMPASS : a pioneering measurement answers a question asked in the early 2000s
The physicists from the Compass collaboration at Cern, which comprises a team from Irfu, have just published the results of a new measurement of the quark structure of the proton [1]. This uncommon but eagerly awaited measurement tends to confirm one of the basic assumptions of the theory of the strong interaction, the Quantum Chromodynamics (QCD).
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COMPASS : a pioneering measurement answers a question asked in the early 2000s
Toward a Better Understanding of the “Time-Like” Structure of the Nucleon
Jan 22, 2017
Toward a Better Understanding of the “Time-Like” Structure of the Nucleon
The fourth dimension of the nucleon
The dynamical view of the internal structure of the nucleon is conveniently described in terms of ‘electromagnetic form factors’, that contain the information on the charge and magnetic currents created by the constituent quarks and gluons.
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