Evidence for the production of slow antiprotonic hydrogen in vacuum.
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.
Zurlo
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Dipartimento di Chimica e Fisica per l'Ingegneria e per i Materiali, Università di Brescia, 25133 Brescia, Italy.
Amoretti
M
M
Amsler
C
C
Bonomi
G
G
Carraro
C
C
Cesar
C L
CL
Charlton
M
M
Doser
M
M
Fontana
A
A
Funakoshi
R
R
Genova
P
P
Hayano
R S
RS
Jørgensen
L V
LV
Kellerbauer
A
A
Lagomarsino
V
V
Landua
R
R
Rizzini
E Lodi
EL
Macrì
M
M
Madsen
N
N
Manuzio
G
G
Mitchard
D
D
Montagna
P
P
Posada
L G
LG
Pruys
H
H
Regenfus
C
C
Rotondi
A
A
Testera
G
G
Van der Werf
D P
DP
Variola
A
A
Venturelli
L
L
Yamazaki
Y
Y