First search for double $β$ decay of dysprosium

Details First search for double $β$ decay of dysprosium First search for double $β$ decay of dysprosium

2011-03-28

arxiv.org/abs/1103.5359v1

Nucl. Phys. A 859 (2011) 126

Physics

Nuclear Physics

Nuclear Experiment

16 pages, 7 figures, 5 tables, submitted for publication

Scientific paper

A search for double $\beta$ decay of dysprosium was realized for the first time with the help of an ultra low-background HP Ge $\gamma$ detector. After 2512 h of data taking with a 322 g sample of dysprosium oxide limits on double beta processes in $^{156}$Dy and $^{158}$Dy have been established on the level of $T_{1/2}\geq 10^{14}-10^{16}$ yr. Possible resonant double electron captures in $^{156}$Dy and $^{158}$Dy were restricted on a similar level. As a by-product of the experiment we have measured the radioactive contamination of the Dy$_2$O$_3$ sample and set limits on the $\alpha$ decay of dysprosium isotopes to the excited levels of daughter nuclei as $T_{1/2}\geq 10^{15} - 10^{17}$ yr.

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