Skip to main content
European Commission logo print header

Searching for The Origin of Cosmic Rays and Neutrinos with LOFAR

Project description

Uncovering the origin of cosmic rays and neutrinos with LOFAR

The origin of cosmic rays remains a mystery in astrophysics: researchers believe that ultra-high-energy cosmic rays come from extragalactic sources, while lower-energy ones stem from our galaxy. The ERC-funded LOFAR project aims to distinguish between these components by studying the mass composition of cosmic rays and neutrinos. Utilising LOFAR, the first telescope capable of detecting individual cosmic rays, researchers involved in the project have suggested an early transition to an extragalactic component. By upgrading the detector and improving detection techniques, researchers will investigate the origin of high-energy cosmic rays and neutrinos and probe for new physics such as cosmic string decays predicted by supersymmetric theories.


The origin of cosmic rays remains one of the largest mysteries in astrophysics. Innovative and accurate radio measurements of cosmic rays and neutrinos with LOFAR promise to provide new answers.
It is generally believed that ultra-high-energy cosmic rays are produced in extragalactic sources like gamma- ray bursts or active galactic nuclei, while the lower energy cosmic rays come from our own Galaxy. At what energy this transition takes place is still unknown. Here we focus on disentangling Galactic and extragalactic components by studying the mass composition between 10^17 and 10^18 eV, a regime that is also crucial for understanding the origin of the extraterrestrial neutrinos detected by IceCube.
We do this with LOFAR, the first radio telescope that can detect individual cosmic rays with hundreds of antennas. This incredible level of detail allowed us to finally understand the complicated radiation mechanism and to perform the first-ever accurate mass analysis based on radio measurements. Our first data reveal a strong proton component below 10^18 eV, suggesting an early transition to an extragalactic component. With upgrades to our detector and techniques we will be able to improve our sample size by an order of magnitude, resolve more mass components, and identify the origin of high-energy cosmic rays and neutrinos.
The technique may be scaled up to higher energies, measured at the Pierre Auger Observatory, where mass information is needed to correlate cosmic rays with their astrophysical sources and to confirm the nature of the cutoff at ~10^19.6 eV.
We can even search for particles beyond the GZK limit. With the Westerbork telescope we have already set the best limit on cosmic rays and neutrinos above 10^23 eV. With LOFAR we will achieve a much better sensitivity at lower energies, also probing for new physics, like the decays of cosmic strings predicted by supersymmetric theories.


Net EU contribution
€ 1 500 000,00
Pleinlaan 2
1050 Bruxelles / brussel

See on map

Région de Bruxelles-Capitale/Brussels Hoofdstedelijk Gewest Région de Bruxelles-Capitale/ Brussels Hoofdstedelijk Gewest Arr. de Bruxelles-Capitale/Arr. Brussel-Hoofdstad
Activity type
Higher or Secondary Education Establishments
Other funding
€ 0,00

Beneficiaries (1)