Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2007-11-23
Phys.Rev.Lett.99:262501,2007
Physics
Nuclear Physics
Nuclear Experiment
4 pages, 3 figures
Scientific paper
10.1103/PhysRevLett.99.262501
We report on the first measurement of the $\beta^+$- and orbital electron capture decay rates of $^{140}$Pr nuclei with the most simple electron configurations: bare nuclei, hydrogen-like and helium-like ions. The measured electron capture decay constant of hydrogen-like $^{140}$Pr$^{58+}$ ions is about 50% larger than that of helium-like $^{140}$Pr$^{57+}$ ions. Moreover, $^{140}$Pr ions with one bound electron decay faster than neutral $^{140}$Pr$^{0+}$ 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.
Batist L.
Beckert K.
Bosch Fritz
Boutin Daniel
Brandau Carsten
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