Speaker
Dr
Chloé Malbrunot
(CERN)
Description
The ASACUSA CUSP collaboration at the Antiproton Decelerator of CERN has recently succeeded in detecting 80 antihydrogen atoms 2.7 meters away from their production trap in a magnetic field free region [1]. This successful detection constitutes a milestone toward precision spectroscopy of antimatter atoms in a beam. The goal of the ASACUSA CUSP collaboration is indeed to measure the ground- state hyperfine splitting of antihydrogen using an atomic spectroscopy beamline. The setup consists of a source of partially polarized antihydrogen atoms [2] emitted toward a radiofrequency spin-flip cavity with its resonance frequency tuned to the hyperfine transition. A superconducting sextupole magnet serves as spin analyser before the detection of the atoms in an antihydrogen detector [3].
Monte Carlo simulations show that the antihydrogen ground-state hyperfine splitting can be determined in such a beam setup at a relative precision of 0.1 ppm which, compared with the same transition in hydrogen, would provide one of the best tests of CPT symmetry.
My talk will present the latest developments on the spectroscopy apparatus downstream of the antihydrogen polarizing source and the coming years program to achieve the above mentioned precision. I will also present the most recent results obtained with the atomic hydrogen beamline developed to test the performance of the spectroscopy apparatus during the CERN accelerator shutdown (LS1).
[1] N. Kuroda et al., Nature Commun. 5, 3089 (2014).
[2] Y. Enomoto et al., Phys. Rev. Lett. 105, 243401 (2010).
[3] E. Widmann et al., Hyperfine Interactions 215, 1-8 (2013).
Primary author
Dr
Chloé Malbrunot
(CERN)
Co-authors
Dr
Balint Radics
(RIKEN Advanced Science Institute)
Bernadette Kolbinger
(Stefan-Meyer-Institut fur subatomare Physik)
Clemens Sauerzopf
(Stefan-Meyer-Institut fur subatomare Physik)
Dr
Eberhard Widmann
(Stefan-Meyer-Institut fur subatomare Physik)
Dr
Johann Zmeskal
(Stefan-Meyer-Institut fur subatomare Physik)
Dr
Ken Suzuki
(Stefan-Meyer-Institut fur subatomare Physik)
Martin Diermaier
(Stefan-Meyer-Institut fur subatomare Physik)
Dr
Martin Simon
(Stefan-Meyer-Institut fur subatomare Physik)
Michael Wolf
(Stefan-Meyer-Institut fur subatomare Physik)
Minori Tajima
(University of Tokyo)
Nazli Dilaver
(Stefan-Meyer-Institut fur subatomare Physik)
Oswald Massiczek
(Stefan-Meyer-Institut fur subatomare Physik)
Dr
Peter Caradonna
(Stefan-Meyer-Institut fur subatomare Physik)
Rikard Lundmark
(Chalmers University of Technology)
Dr
Yugo Nagata
(RIKEN Advanced Science Institute)
