*
Dear Friends,
On Thursday, April 4, there will be an ITAMP topical lunch discussion.
Tea Room (P-226) @ CfA (60 Garden Street)
Time: 12:00-1:30
As always pizza will be served.
Speaker: Jack DiSciacca
Title: Single Particle Measurment of the Proton and Antipoton Magnetic
Moments
Abstract:
We report the first measurements of the proton and antiproton magnetic
moments using a single particle. The antiproton result represents a factor
of 680 improvement in precision over previous work using exotic atom
spectroscopy, which has achieved a 3000 ppm precision and remained
essentially unchanged in the past 20 years. Our measurement allows for an
improved comparison of the proton and antiproton magnetic moments, yielding
a result consistent with the prediction of charge, parity and time reversal
symmetry. Following a proof of principle, 2.5 ppm measurement of the proton
magnetic moment, the experiment was moved to CERN for the antiproton
experiment. Initial work focused on catching, cooling and trapping a single
antiproton from the 5 MeV beam at CERN's Antiproton Decelerator. Following
this work, we undertook a magnetic moment measurement. Prospects for
further improvement should be possible with single spin flip detection,
similar to what was used to measure the electron magnetic moment.
Looking forward to seeing you there,
Misha Lemeshko*
--
Dr. Mikhail Lemeshko
Institute for Theoretical Atomic, Molecular, and Optical Physics (ITAMP)
Harvard-Smithsonian Center for Astrophysics MS-14
60 Garden St.
Cambridge, MA 02138
U.S.A.
mlemeshko(a)cfa.harvard.edu
http://sites.google.com/site/mishalemeshko/
Tel. +1 (617) 496-7610
Fax +1 (617) 496-7668