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Title: Measurement of PeV Galactic Cosmic Rays
Speaker: Dr. Giuseppe Di Sciascio (INFN, Rome)
Host: Dr. Quanbu Gou
Time: 20:00 (Beijing Time), Tuesday, 2022-05-10
Zoom meeting ID: 919207
Abstract: Cosmic rays represent one of the most important energy transformation processes of the universe. They bring information about the surrounding universe, our galaxy, and very probably also the extragalactic space, at least at the highest observed energies. More than one century after their discovery, we have no definitive models yet about the origin, acceleration and propagation processes of the radiation. The main reason is that there are still significant discrepancies among the results obtained by different experiments located at ground level, probably due to unknown systematic uncertainties affecting the measurements. In this lecture, I will focus on the detection of galactic cosmic rays from ground with air shower arrays up to 10^18 eV.
The aim of this talk is to discuss the conflicting results in the 10^15 eV energy range and the perspectives to clarify the origin of the so-called `knee' in the all-particle energy spectrum, crucial to give a solid basis for models up to the end of the cosmic ray spectrum. I will provide elements useful to understand the basic techniques used in reconstructing primary particle characteristics (energy, mass, and arrival direction) from the ground, and to show why indirect measurements are difficult and results are still conflicting.
About the speaker:
Giuseppe Di Sciascio is a Senior Researcher of the INFN at the University of Roma Tor Vergata (permanent position). He got his doctor degree in 1993 at University of Naples. He has been the Spokesperson of the Italian side of the ARGO-YBJ Collaboration since 2012. From 2019 to present he is in charge of the Cosmic Ray Working Group of the MATHUSLA experiment at CERN and of the SWGO experiment in South America. He is responsible of the Rome Tor Vergata group in the E989 experiment (g-2) at Fermilab.