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Search for beta+EC and ECEC processes in Sn-112

Sep, 2009

14 pages

Published in:

Phys.Rev.C 80 (2009) 035501

e-Print:

0909.1177 [nucl-ex]

DOI:

10.1103/PhysRevC.80.035501

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Abstract: (arXiv)

Limits on

\beta^+

EC (here EC denotes electron capture) and ECEC processes in

^{112}

Sn have been obtained using a 380 cm

^3

HPGe detector and an external source consisting of 53.355 g enriched tin (94.32% of

^{112}

Sn). A limit with 90% C.L. on the

^{112}

Sn half-life of

4.7\times 10^{20}

y for the ECEC(0

\nu

) transition to the

0^+_3

excited state in

^{112}

Cd (1871.0 keV) has been established. This transition is discussed in the context of a possible enhancement of the decay rate by several orders of magnitude given that the ECEC

(0\nu)

process is nearly degenerate with an excited state in the daughter nuclide. Prospects for investigating such a process in future experiments are discussed. The limits on other

\beta^+

EC and ECEC processes in

^{112}

Sn were obtained on the level of

(0.6-8.7)\times 10^{20}

y at the 90% C.L.

14.60.Pq
27.60.+j
23.40.-s
tin: nuclide
nucleus: semileptonic decay
positron: production
electron: capture
capture: (2electron)
photon: energy spectrum
lifetime: lower limit

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