Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2008-01-21
Physics
Nuclear Physics
Nuclear Theory
17 pages
Scientific paper
According to the recent experimental data of a GSI--experiment, the rate of the number of daughter ions $^{140}{\rm Ce}^{58+}$, produced by a nuclear K--shell electron capture (EC) of the H--like ion ${^{140}}{\rm Pr}^{58+}$, is modulated in time with a period $T_d=(7.06\pm 8) $seconds. We explain this phenomenon by neutrino--flavour mixing and show that this can be understood within standard quantum field theory and derive a value for the squared mass difference $\Delta m^2_{21}=m^2_2-m^2_1=(0.763\pm 8) \cdot 10^{-4} \mathrm{eV}^2$. This proves that such processes provide a precise method to investigate neutrino--flavour mixing.
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