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キーワード:
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要旨:
The novel Penning-trap mass spectrometer Pentatrap aims for mass-ratio measurements
of highly-charged ions with a relative precision of a few parts in 1012. As the
key part, an innovative trap assembly was designed. It consists of five cylindrical traps
allowing for simultaneous measurements of two ion species and for continuous monitoring
of the trapping conditions. This promises a substantial reduction of systematic
errors. Moreover, in the course of this thesis a detection system was developed and
characterized, which will enable fast and accurate measurements through its single-ion
sensitivity and high signal-to-noise ratio.
In neutrino physics, the detection of neutrinoless double-electron capture would unambiguously
prove the Majorana nature of neutrinos. In search for a suitable nuclide
for the observation of this process, precise information about the total decay energy
(Q-value) is needed in order to find a transition with a resonant enhancement of the
decay rate. The mass ratios of 152Sm/ 152Gd and 164Dy/ 164Er were measured to a relative
uncertainty of ~ 10−9 at Shiptrap. This presents the first directly determined
Q-values for the corresponding transitions.
