Spectral shape of the two-photon decay of the 2 1S0 state in he-like tin.
The spectral distribution of the 1s2s {1}S{0}-->1s{2} 1S0 two-photon decay of He-like tin was measured using a novel approach at the gas-jet target of the ESR storage ring. Relativistic collisions of Li-like projectiles with low-density gaseous matter have been exploited to selectively populate the desired 1s2s state. Compared to conventional techniques, this approach results in a substantial gain in statistical and systematic accuracy, which allowed us to achieve for the first time a sensitivity to relativistic effects on the two-photon decay spectral shape as well as to discriminate the measured spectrum for Sn from theoretical shapes for different elements along the He-isoelectronic sequence.
Trotsenko
S
S
Institut für Kernphysik, Universität Frankfurt, D-60438 Frankfurt, Germany.
Kumar
A
A
Volotka
A V
AV
Banaś
D
D
Beyer
H F
HF
Bräuning
H
H
Fritzsche
S
S
Gumberidze
A
A
Hagmann
S
S
Hess
S
S
Jagodziński
P
P
Kozhuharov
C
C
Reuschl
R
R
Salem
S
S
Simon
A
A
Spillmann
U
U
Trassinelli
M
M
Tribedi
L C
LC
Weber
G
G
Winters
D
D
Stöhlker
Th
T