2,842 research outputs found
Search for EC and ECEC processes in Sn and decay of Sn to the excited states of Te
Limits on EC and ECEC processes in Sn and on
decay of Sn to the excited states of Te have
been obtained using a 380 cm HPGe detector and an external source
consisting of natural tin. A limit with 90% C.L. on the Sn half-life of
y for the ECEC(0) transition to the excited
state in 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 process is nearly degenerate
with an excited state in the daughter nuclide. Prospects for investigating such
a process in future experiments are discussed. The decay
limits for Sn to the excited states of Te were obtained on the
level of y at the 90% C.L.Comment: 17 pages, 5 figure
Investigation of decay in Nd and Nd to the excited states of daughter nuclei
Double beta decay of Nd and Nd to the excited states of
daughter nuclei have been studied using a 400 cm low-background HPGe
detector and an external source consisting of 3046 g of natural NdO
powder. The half-life for the two-neutrino double beta decay of Nd to
the excited 0 state in Sm is measured to be
y.
For other transitions to the 2, 2, 2, and
0 levels in Sm, limits are obtained at the level of y. In the case of Nd only limits for the transitions to the 2, 0, and 2 excited states in
Sm were obtained and are at the level of \sim (4-8)\cdot 10^{20}$ y.Comment: 13 pages, 6 figure
Average and recommended half-life values for two neutrino double beta decay: upgrade-2013
All existing positive results on two neutrino double beta decay in different
nuclei were analyzed. Using the procedure recommended by the Particle Data
Group, weighted average values for half-lives of Ca, Ge,
Se, Zr, Mo, Mo - Ru (),
Cd, Te, Xe, Nd, Nd - Sm
() and U were obtained. Existing geochemical data were analyzed
and recommended values for half-lives of Te and Ba are
proposed. I recommend the use of these results as the most currently reliable
values for half-lives.Comment: 9 p, Invited talk at MEDEX'13 (Prague, Czech Republic, June 11-14,
2013
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