title: Spectral shape of the two-photon decay of the 2 1S0 state in he-like tin.
abstract: 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.
authors.affiliation: Institut für Kernphysik, Universität Frankfurt, D-60438 Frankfurt, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Trotsenko
authors.forename: A
authors.initials: A
authors.lastname: Kumar
authors.forename: A V
authors.initials: AV
authors.lastname: Volotka
authors.forename: D
authors.initials: D
authors.lastname: Banaś
authors.forename: H F
authors.initials: HF
authors.lastname: Beyer
authors.forename: H
authors.initials: H
authors.lastname: Bräuning
authors.forename: S
authors.initials: S
authors.lastname: Fritzsche
authors.forename: A
authors.initials: A
authors.lastname: Gumberidze
authors.forename: S
authors.initials: S
authors.lastname: Hagmann
authors.forename: S
authors.initials: S
authors.lastname: Hess
authors.forename: P
authors.initials: P
authors.lastname: Jagodziński
authors.forename: C
authors.initials: C
authors.lastname: Kozhuharov
authors.forename: R
authors.initials: R
authors.lastname: Reuschl
authors.forename: S
authors.initials: S
authors.lastname: Salem
authors.forename: A
authors.initials: A
authors.lastname: Simon
authors.forename: U
authors.initials: U
authors.lastname: Spillmann
authors.forename: M
authors.initials: M
authors.lastname: Trassinelli
authors.forename: L C
authors.initials: LC
authors.lastname: Tribedi
authors.forename: G
authors.initials: G
authors.lastname: Weber
authors.forename: D
authors.initials: D
authors.lastname: Winters
authors.forename: Th
authors.initials: T
authors.lastname: Stöhlker