测量完全电离的类氢和类氦140Pr离子中的β+衰变率和轨道电子俘获衰变率。
Measurement of the beta+ and orbital electron-capture decay rates in fully ionized, hydrogenlike, and heliumlike 140Pr ions.
作者信息
Litvinov Yu A, Bosch F, Geissel H, Kurcewicz J, Patyk Z, Winckler N, Batist L, Beckert K, Boutin D, Brandau C, Chen L, Dimopoulou C, Fabian B, Faestermann T, Fragner A, Grigorenko L, Haettner E, Hess S, Kienle P, Knöbel R, Kozhuharov C, Litvinov S A, Maier L, Mazzocco M, Montes F, Münzenberg G, Musumarra A, Nociforo C, Nolden F, Pfützner M, Plass W R, Prochazka A, Reda R, Reuschl R, Scheidenberger C, Steck M, Stöhlker T, Torilov S, Trassinelli M, Sun B, Weick H, Winkler M
机构信息
Gesellschaft für Schwerionenforschung GSI, Planckstrasse 1, 64291 Darmstadt, Germany.
出版信息
Phys Rev Lett. 2007 Dec 31;99(26):262501. doi: 10.1103/PhysRevLett.99.262501. Epub 2007 Dec 26.
We report on the first measurement of the beta+ 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 hydrogenlike 140Pr58+ ions is about 50% larger than that of heliumlike 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.
我们报道了对具有最简单电子构型的(^{140}Pr)核的(\beta^+)衰变率和轨道电子俘获衰变率的首次测量，这些构型包括裸核、类氢离子和类氦离子。测量得到的类氢(^{140}Pr^{58 +})离子的电子俘获衰变常数比类氦(^{140}Pr^{57 +})离子的约大50%。此外，具有一个束缚电子的(^{140}Pr)离子比具有59个电子的中性(^{140}Pr^{0 +})原子衰变更快。为了解释这一奇特的观测结果，必须考虑总角动量守恒，因为只有原子核和被俘获电子的特定自旋取向才能导致允许的衰变。
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