title: Trapped antihydrogen in its ground state.
abstract: Antihydrogen atoms (H¯) are confined in an Ioffe trap for 15-1000 s-long enough to ensure that they reach their ground state. Though reproducibility challenges remain in making large numbers of cold antiprotons (p¯) and positrons (e(+)) interact, 5±1 simultaneously confined ground-state atoms are produced and observed on average, substantially more than previously reported. Increases in the number of simultaneously trapped H¯ are critical if laser cooling of trapped H¯ is to be demonstrated and spectroscopic studies at interesting levels of precision are to be carried out.
authors.affiliation: Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA. gabrielse@physics.harvard.edu
authors.forename: G
authors.initials: G
authors.lastname: Gabrielse
authors.forename: R
authors.initials: R
authors.lastname: Kalra
authors.forename: W S
authors.initials: WS
authors.lastname: Kolthammer
authors.forename: R
authors.initials: R
authors.lastname: McConnell
authors.forename: P
authors.initials: P
authors.lastname: Richerme
authors.forename: D
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authors.lastname: Grzonka
authors.forename: W
authors.initials: W
authors.lastname: Oelert
authors.forename: T
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authors.lastname: Sefzick
authors.forename: M
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authors.lastname: Zielinski
authors.forename: D W
authors.initials: DW
authors.lastname: Fitzakerley
authors.forename: M C
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authors.lastname: George
authors.forename: E A
authors.initials: EA
authors.lastname: Hessels
authors.forename: C H
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authors.lastname: Storry
authors.forename: M
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authors.lastname: Weel
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authors.lastname: Müllers
authors.forename: J
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authors.lastname: Walz