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Search for resonant enhancement of neutrinoless double-electron capture by high-precision Penning-trap mass spectrometry

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons30445

Eliseev,  Sergey
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons30312

Blaum,  Klaus
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Zitation

Eliseev, S., Novikov, Y. N., & Blaum, K. (2012). Search for resonant enhancement of neutrinoless double-electron capture by high-precision Penning-trap mass spectrometry. Journal of Physics G: Nuclear and Particle Physics, 39(12): 124003, pp. 1-21. doi:10.1088/0954-3899/39/12/124003.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0010-1F16-B
Zusammenfassung
The search for neutrinoless double-electron capture can be a good alternative to the neutrinoless double-beta-decay xperiments in shedding light on such aspects of neutrino physics as the neutrino type, non-conservation of the total lepton charge and magnitude of the effective Majorana neutrino mass. The probability of neutrinoless double-electron capture can be resonantly enhanced by some orders of magnitude. Although the phenomenon of the resonant enhancement was predicted some decades ago, the search for resonantly enhanced neutrinoless double-electron-capture transitions was hampered by a lack of precise experimental values of the atomic mass differences of the transition initial and final states. Only recent progress in high-precision Penning-trap mass spectrometry has finally provided suitable means for a determination of atomicmasseswith a sufficient precision and thus given rise to the experimental campaign for a search for resonantly enhanced transitions. In this article, after an introduction to the theory of neutrinoless double-electron capture and the Penning-trap technique, a review is given on the results of systematic very precise direct Penning-trap measurements of the atomic mass differences of the nuclides which can undergo double-electron capture. The mass differences of 14 nuclear pairs have already been determined with a typical uncertainty of tens to a few hundreds of eV. Partial or even full resonant enhancement of the neutrinoless double-electron-capture probability has been discovered for 152Gd and 156Dy. In 156Dy a multiple resonance phenomenon has been revealed. For some transitions the half-lives have been estimated (152Gd, 164Er, 180W, 156Dy).