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MPINP:
Präzisionsexperimente - Abteilung Blaum
Abstract:
In neutrino physics, a variety of experiments aim for the determination of the neutrino
mass by means of the beta-decay and electron-capture spectra, while a detection of the
neutrinoless double-electron capture would reveal the Majorana nature of neutrinos.
However, a lack of knowledge on the total decay energy (Q-value) of these processes
constrains present neutrino experiments.
To this end, high-precision measurements of the Q-values are obligatory. In order to
find suitable nuclides for neutrinoless double-electron capture experiments, a determination
of the Q-values by direct Penning-trap mass-ratio measurements on 106Pd/ 102Ru,
106Cd/ 106Pd, 144Sm/ 144Nd and 156Dy/ 156Gd with a relative precision of a few 10−9 were
performed for the first time at SHIPTRAP using the Time-of-Flight Ion-Cyclotron-
Resonance (ToF-ICR) detection technique and the multiresonance phenomenon in 156Dy
was discovered.
A novel Phase Imaging Ion-Cyclotron-Resonance detection technique was developed being
substantially faster and providing ca. 40-fold gain in resolving power in comparison
with the presently used ToF-ICR technique.
The novel Penning-trap mass spectrometer PENTATRAP aims for direct mass-ratio
measurements with a relative precision better than 10−11, which is required for the betadecay
and electron-capture experiments. In this context, the PENTATRAP Control
System was developed in order to maximize the efficiency of the measurement process.
