title: Time modulation of the beta{+}-decay rate of H-like 140Pr58+ ions.
abstract: Recent experimental data at GSI on the rates of the number of daughter ions, produced by the nuclear K-shell electron capture (EC) decays of the H-like ions 140Pr58+ and 142Pm60+, suggest that they are modulated in time with periods T_{EC} approximately 7 sec and amplitudes a_{EC} approximately 0.20. Since it is known that these ions are unstable also under the nuclear positron (beta;{+}) decays, we study a possible time dependence of the nuclear beta;{+}-decay rate of the H-like 140Pr58+ ion. We show that the time dependence of the beta;{+}-decay rate of the H-like 140Pr58+ ion as well as any H-like heavy ions cannot be observed.
authors.affiliation: Atominstitut der Osterreichischen Universitäten, Technische Universität Wien, Wiedner Hauptstrasse 8-10, A-1040 Wien, Austria. ivanov@kph.tuwien.ac.at
authors.forename: A N
authors.initials: AN
authors.lastname: Ivanov
authors.forename: E L
authors.initials: EL
authors.lastname: Kryshen
authors.forename: M
authors.initials: M
authors.lastname: Pitschmann
authors.forename: P
authors.initials: P
authors.lastname: Kienle