Resonant Enhancement of Neutrinoless Double-Electron Capture in Gd-152 - INSPIRE

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Resonant Enhancement of Neutrinoless Double-Electron Capture in Gd-152

S. Eliseev
(
- Heidelberg, Max Planck Inst.
)
,
C. Roux
(
- Heidelberg, Max Planck Inst.
)
,
K. Blaum
(
- Heidelberg, Max Planck Inst. and
- Heidelberg U.
)
,
M. Block
(
- Darmstadt, GSI
)
,
C. Droese
(
- Greifswald U.
)

Feb 4, 2011

4 pages

Published in:

Phys.Rev.Lett. 106 (2011) 052504

DOI:

10.1103/PhysRevLett.106.052504

View in:

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Abstract: (APS)

In the search for the nuclide with the largest probability for neutrinoless double-electron capture, we have determined the Qϵϵ value between the ground states of Gd152 and Sm152 by Penning-trap mass-ratio measurements. The new Qϵϵ value of 55.70(18) keV results in a half-life of 1026 yr for a 1 eV neutrino mass. With this smallest half-life among known 0νϵϵ transitions, Gd152 is a promising candidate for the search for neutrinoless double-electron capture.

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