Recent Progress of Laser Spectroscopy Experiments on Antiprotonic Helium

Overview

Journal Philos Trans A Math Phys Eng Sci

Specialties Biomedical Engineering
Biophysics
Public Health

Date 2018 Feb 21

PMID 29459410

Citations 1

Authors

Masaki Hori

Affiliations

Soon will be listed here.

Abstract

The Atomic Spectroscopy and Collisions Using Slow Antiprotons (ASACUSA) collaboration is currently carrying out laser spectroscopy experiments on antiprotonic helium [Formula: see text] atoms at CERN's Antiproton Decelerator facility. Two-photon spectroscopic techniques have been employed to reduce the Doppler width of the measured [Formula: see text] resonance lines, and determine the atomic transition frequencies to a fractional precision of 2.3-5 parts in 10 More recently, single-photon spectroscopy of buffer-gas cooled [Formula: see text] has reached a similar precision. By comparing the results with three-body quantum electrodynamics calculations, the antiproton-to-electron mass ratio was determined as [Formula: see text], which agrees with the known proton-to-electron mass ratio with a precision of 8×10 The high-quality antiproton beam provided by the future Extra Low Energy Antiproton Ring (ELENA) facility should enable further improvements in the experimental precision.This article is part of the Theo Murphy meeting issue 'Antiproton physics in the ELENA era'.

Citing Articles

Antiproton physics in the ELENA era.

Madsen N Philos Trans A Math Phys Eng Sci. 2018; 376(2116).

PMID: 29459419 PMC: 5829179. DOI: 10.1098/rsta.2017.0278.

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