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The mass difference of the nuclides 180 W and 180 Hf has been measured with the Penning-trap mass spectrometer SHIPTRAP to investigate 180 W as a possible candidate for the search for neutrinoless double-electron capture. The Qϵϵ-value was measured to 143.20(27) keV. This value in combination with the calculations of the atomic electron wave functions and other parameters results...
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