Precision measurement of the hyperfine structure of laser-cooled radioactive 7Be+ ions produced by projectile fragmentation.
The ground state hyperfine splitting of (7)Be+ has been measured by laser-microwave double-resonance spectroscopy in the online rf trap of RIKEN's slow RI-beam facility. Be ions produced by projectile fragmentation of 13C at approximately 1 GeV were thermalized in a rf ion guide gas cell and subsequently laser cooled in the ion trap to approximately 1 microeV. This 10(15)-fold reduction of the kinetic energy allows precision spectroscopy of these ions. A magnetic hfs constant of A=-742.772 28(43) MHz was measured for 7Be+, from which a nuclear magnetic moment of mu(I)=-1.399 28(2)mu(N) was deduced.
Okada
K
K
Department of Physics, Sophia University, 7-1 Kioicho, Chiyoda, Tokyo 102-8554, Japan.
Wada
M
M
Nakamura
T
T
Takamine
A
A
Lioubimov
V
V
Schury
P
P
Ishida
Y
Y
Sonoda
T
T
Ogawa
M
M
Yamazaki
Y
Y
Kanai
Y
Y
Kojima
T M
TM
Yoshida
A
A
Kubo
T
T
Katayama
I
I
Ohtani
S
S
Wollnik
H
H
Schuessler
H A
HA