Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: First search for double $\beta$ decay of dysprosium   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.

4
The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess