Quick search Find article
Quick search
Find article

Improved study of the antiprotonic helium hyperfine structure

FREE ARTICLE

T Pask1, D Barna2,3, A Dax2, R S Hayano2, M Hori2,5, D Horváth3,4, B Juhász1, C Malbrunot1,6, J Marton1, N Ono2, K Suzuki1, J Zmeskal1 and E Widmann1

Show affiliations


FAST TRACK COMMUNICATION

We report the initial results from a systematic study of the hyperfine (HF) structure of antiprotonic helium (n, l) = (37, 35) carried out at the antiproton decelerator (AD) at CERN. We performed laser–microwave–laser resonance spectroscopy using a continuous wave (CW) pulse-amplified laser system and microwave cavity to measure the HF transition frequencies. Improvements in the spectral linewidth and stability of our laser system have increased the precision of these measurements by a factor of 5 and reduced the linewidth by a factor of 3 compared to our previous results. A comparison of the experimentally measured transition frequencies with three-body QED calculations can be used to determine the antiproton spin magnetic moment, leading towards a test of CPT invariance.


PACS

36.10.Gv Mesonic, hyperonic and antiprotonic atoms and molecules

32.10.Fn Fine and hyperfine structure

32.70.Jz Line shapes, widths, and shifts

32.80.-t Photoionization and excitation

32.10.Dk Electric and magnetic moments, polarizabilities

Subjects

Atomic and molecular physics

Dates

Issue 8 (28 April 2008)

Received 4 March 2008, in final form 13 March 2008

Published 3 April 2008



View by subject




Export








Please login to access our web services, or create an account if you don't yet have one.

You must have cookies enabled in your web browser to be able to login.

Username
Password

Forgotten your password? Get a new one here.