[Triumf-seminars] TRIUMF Colloquium today at 14:00

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Date/Time: Tue 2011-04-26 at 14:00

Location:  Auditorium          

Speaker:   Ryugo S. Hayano (Department of Physics, University of Tokyo)

Title:     20 Years of Antiprotonic Helium

Abstract: Antiprotonic helium is a metastable three-body neutral atom consisting of an antiproton, a helium nucleus and an electron, discovered by us at KEK in 1991, and is being extensively studied at CERN's antiproton decelerator facility CERN AD.

The antiproton, which normally annihilates within a few picoseconds when injected into matter, can be "stored" in the antiprotonic helium atom for up to several microseconds, and sub-ppb-scale laser spectroscopy is possible within this time window. From the laser transition frequency, the (anti)proton-to-electron mass ratio can be deduced, and our results contribute to the CODATA fundamental constant adjustments.

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Professor Hayano is the spokesperson of the ASACUSA collaboration at CERN, and the winner of 2008 Nishina Memorial Prize.

Stimulants available 15 minutes before the talk.

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