NDLI: ATRAP antihydrogen experiments and update

Content Provider	Springer Nature Link
Author	Storry, C. H.
Copyright Year	2007
Abstract	Antihydrogen (Hbar) was first produced at CERN in 1995. Over the past decade our ATRAP collaboration has made massive progress toward our goal of producing large numbers of cold Hbar atoms that will be captured in a magnetic gradient trap for precise comparison between the atomic spectra of matter and antimatter. The AD at CERN provides bunches of 3 × 107 low energy antiprotons approximately every 90 s. We capture and cool to 4 K, 0.1% of these in a cryogenic Penning trap. By stacking many bunches we are able to do experiments with 3 × 105 Antiprotons. Approximately 100 positrons (e+)/s from a 22 Na radioactive source are captured and cooled in the trap, with 5 × 106 available experiments. We have developed two ways to make Hbar from these cold ingredients, namely three-body collisions, and two-stage Rydberg charge exchange. We have also developed techniques to measure the excited-state distribution of the Hbar and measure their velocity. A new apparatus is being used this year that includes a e+ accumulator built at York University providing many more e+. The new antiproton annihilation detector provides spatial information of annihilations. Windows allow lasers to enter the trap for spectroscopic measurements and for laser cooling of the Hbar. Possibly the most exciting inclusion in this new apparatus is the inclusion of a neutral particle trap which may, for the first time, capture the Hbar and lead to the first atomic spectrum from antimatter.
Starting Page	91
Ending Page	96
Page Count	6
File Format	PDF
ISSN	03043843
Journal	Hyperfine Interactions
Volume Number	172
Issue Number	1-3
e-ISSN	15729540
Language	English
Publisher	Springer Netherlands
Publisher Date	2007-07-10
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Antihydrogen CPT test Spectroscopy Antimatter Positrons Positronium Antiprotons Penning trap Charge-exchange Rydberg atoms Surfaces and Interfaces, Thin Films Condensed Matter Atoms, Molecules, Clusters and Plasmas Nuclear Physics, Heavy Ions, Hadrons
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Atomic and Molecular Physics, and Optics Physical and Theoretical Chemistry Condensed Matter Physics

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