Evidence for a mixed mass composition at the 'ankle' in the cosmic ray spectrum

The highest energy cosmic rays remain elusive and mysterious, and their study requires extraordinary efforts.

A world-record sensitivity on the flux of ultrarelativistic magnetic monopoles

Maxwell’s unified description of electric and magnetic phenomena is one of the greatest achievements of 19th century physics.

Reconstruction of the muon production depth in the atmosphere with the surface detectors of the Pierre Auger Observatory

Cosmic rays are energetic particles, mostly atomic nuclei, raining down upon the Earth from the depths of the cosmos.

First SSD stations deployed in the field

On Sep. 15, 2016 six Surface Scintillator Detector (SSD) stations were deployed with a single trip to the engineering array site.

Obituary on Jim Cronin by Alan Watson

On 21 September 2016 Alan Watson published an obituary on his collegue and friend Jim Cronin on the website of the international weekly journal of science Nature.

Memories of James W. Cronin

On the occasion of the celebration of Jim Cronin’s life on September 30, 2016 came up the idea to gather individual recollections and stories about Jim and the Auger Observatory over the years.

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