title: Evidence for the production of slow antiprotonic hydrogen in vacuum.
abstract: We present evidence showing how antiprotonic hydrogen, the quasistable antiproton (p)-proton bound system, has been synthesized following the interaction of antiprotons with the molecular ion H2+ in a nested Penning trap environment. From a careful analysis of the spatial distributions of antiproton annihilation events, evidence is presented for antiprotonic hydrogen production with sub-eV kinetic energies in states around n=70, and with low angular momenta. The slow antiprotonic hydrogen may be studied using laser spectroscopic techniques.
authors.affiliation: Dipartimento di Chimica e Fisica per l'Ingegneria e per i Materiali, Università di Brescia, 25133 Brescia, Italy.
authors.forename: N
authors.initials: N
authors.lastname: Zurlo
authors.forename: M
authors.initials: M
authors.lastname: Amoretti
authors.forename: C
authors.initials: C
authors.lastname: Amsler
authors.forename: G
authors.initials: G
authors.lastname: Bonomi
authors.forename: C
authors.initials: C
authors.lastname: Carraro
authors.forename: C L
authors.initials: CL
authors.lastname: Cesar
authors.forename: M
authors.initials: M
authors.lastname: Charlton
authors.forename: M
authors.initials: M
authors.lastname: Doser
authors.forename: A
authors.initials: A
authors.lastname: Fontana
authors.forename: R
authors.initials: R
authors.lastname: Funakoshi
authors.forename: P
authors.initials: P
authors.lastname: Genova
authors.forename: R S
authors.initials: RS
authors.lastname: Hayano
authors.forename: L V
authors.initials: LV
authors.lastname: Jørgensen
authors.forename: A
authors.initials: A
authors.lastname: Kellerbauer
authors.forename: V
authors.initials: V
authors.lastname: Lagomarsino
authors.forename: R
authors.initials: R
authors.lastname: Landua
authors.forename: E Lodi
authors.initials: EL
authors.lastname: Rizzini
authors.forename: M
authors.initials: M
authors.lastname: Macrì
authors.forename: N
authors.initials: N
authors.lastname: Madsen
authors.forename: G
authors.initials: G
authors.lastname: Manuzio
authors.forename: D
authors.initials: D
authors.lastname: Mitchard
authors.forename: P
authors.initials: P
authors.lastname: Montagna
authors.forename: L G
authors.initials: LG
authors.lastname: Posada
authors.forename: H
authors.initials: H
authors.lastname: Pruys
authors.forename: C
authors.initials: C
authors.lastname: Regenfus
authors.forename: A
authors.initials: A
authors.lastname: Rotondi
authors.forename: G
authors.initials: G
authors.lastname: Testera
authors.forename: D P
authors.initials: DP
authors.lastname: Van der Werf
authors.forename: A
authors.initials: A
authors.lastname: Variola
authors.forename: L
authors.initials: L
authors.lastname: Venturelli
authors.forename: Y
authors.initials: Y
authors.lastname: Yamazaki