Measurement of the β<sup>+</sup> and orbital electron-capture decay rates in fully ionized, hydrogenlike, and helium like <sup>140</sup>Pr ions
- Litvinov, Yu. A.
- Bosch, F.
- Geissel, H.
- Kurcewicz, J.
- Patyk, Z.
- Winckler, N.
- Batist, L.
- Beckert, K.
- Boutin, D.
- Brandau, C.
- Chen, Lin
- Dimopoulou, C.
- Fabian, B.
- Faestermann, T.
- Fragner, A.
- Grigorenko, L.
- Haettner, E.
- Hess, S.
- Kienle, P.
- Knoebel, R.
- Kozhuharov, C.
- Litvinov, S. A.
- Maier, L.
- Mazzocco, M.
- Montes, F.
- Muenzenberg, G.
- Musumarra, A.
- Nociforo, C.
- Nolden, F.
- Pfuetzner, M.
- Plass, W. R.
- Prochazka, A.
- Reda, R.
- Reuschl, R.
- Scheidenberger, C.
- Steck, M.
- Stoehlker, T.
- Torilov, S.
- Trassinelli, Martino
- Sun, B.
- Weick, H.
- Winkler, M.
DOIAbstract
International audienceWe report on the first measurement of the β+ and orbital electron-capture decay rates of 140Pr nuclei with the simplest electron configurations: bare nuclei, hydrogenlike, and heliumlike ions. The measured electron-capture decay constant of hydrogen like 140Pr58+ ions is about 50% larger than that of helium like 140Pr57+ ions. Moreover, 140Pr ions with one bound electron decay faster than neutral 140Pr0+ atoms with 59 electrons. To explain this peculiar observation one has to take into account the conservation of the total angular momentum, since only particular spin orientations of the nucleus and of the captured electron can contribute to the allowed decay
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