About the INPA Seminars

All seminars are on Fridays (unless otherwise noted) and start at 12:00 (noon) with a brief presentation of the weekly scientific news. Typically the talks end by 13:00. The seminars take place in Bldg. 50A, room 5132.

The committee members are:

The following Seminar schedule for the Institute for Nuclear and Particle Astrophysics is tentative. The seminar becomes final usually a few days before the Friday of the talk.

If you have questions, comments, suggestions or like to be added to the INPA News mailing list please contact Paris Gordon at 510-486-4903 pcgordon@lbl.gov

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VIRTUAL INPA SEMINAR | Alessio Porcelli (Ghent University)

July 9 @ 12:00 pm - 1:00 pm

Speaker: Alessio Porcelli (Ghent University)

Title: Method To Measure The Cosmic Rays Mass Composition With IceCube/IceTop


There is an intrinsic difficulty in measuring the mass of Cosmic rays at Ultra-High Energy. The only possible way involves measuring the Extensive Air Showers (EAS) characteristics produced by hadronic interactions of the incoming particle (primary) with the atmosphere: it behaves as a calorimeter producing secondary particles. EAS are characterized by a longitudinal profile along the shower development and a lateral one at the ground around the shower core. In the latter distribution, because of the shower physics, the information of the mass is delivered by the muon component.

IceTop is part of the IceCube experiment, sited at the geographic South Pole. While the latter consists of 86 strings drilled inside the ice covering a kilometer cube to detect neutrinos from astrophysical origins, the former are stations on the top of such strings used to veto atmospheric neutrinos. IceTop consists of 81 stations, each with two water Cherenkov detectors with two Photomultiplier Tubes each, able to detect Cherenkov light produced by the crossing charged particles. This setup of detectors can also be used to measure the EAS lateral distribution, letting IceCube be able to measure also Cosmic Rays with energies above 1 PeV and up to 1 EeV.

Two different approaches will be presented in the seminar, using IceTop alone or together with the in-ice part of IceCube. Moreover, improvement attempts will be depicted: analysis strategies and the incoming extension IceCube-Gen2.

Join Zoom Meeting


Meeting ID: 932 6188 5135

Passcode: 113108


July 9
12:00 pm - 1:00 pm

INPA guests from campus can now come up to the lab early on Fridays. The INPA Common Room (50-5026) is reserved for our guests from 10:00 am to 12:00 noon, and from 1 pm to 5 pm. Note that the seminars are now held in 50A-5132 to accommodate a larger number of attendees.

Also, on Fridays from 1:00 pm to 2:00 pm you are welcome to join the INPA Speaker for a brown-bag lunch in the small Pers Hall conference room, 54-130B.

INPA Tea Series

The Physics and Nuclear Science Divisions have together been leaders in revolutionary changes in our understanding of neutrinos and cosmology. Everyone is welcome to attend the open forum. Tea and light refreshments will be served.

INPA Common Room (50-5026)
3:30 pm

Access to the Lab

For a shuttle pass please email Paris Gordon. Please note: the pass is only valid for the day of the seminar.

If you have questions, comments, or suggestions please contact, preferably via email, Paris Gordon.