Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of $\beta\beta$ Decay-Simulating Events in Nuclear Emulsion
  with Molybdenum Filling   The measurement of positron--nucleus collisions was used to estimate the
possibility of suppressing background events that simulate $\beta\beta$ decay
in the emulsion region adjacent to molybdenum conglomerates. The range of the
escape of two relativistic particles from the interaction was found to be $<d>
= (0.60\pm 0.03) ~\mu$m, which approximately corresponds to the grain size of
developed nuclear emulsion. No correlation of the values of d with the angle
between two relativistic particles was observed. It was shown that it was
possible to exclude $\beta\beta$ decay background from electrons emerging in
the decay of elements of naturally occurring radioactive chains. The background
from $\beta$ decays of $^{90}$Sr and $^{40}$K available in emulsion around Mo
conglomerates was determined by the ratio of the volume $(\sim d^3)$ to the
total volume of emulsion and was found to be $1.5\cdot 10^{-2}$. It was shown
that the backgrounds from $^{40}$K, $^{90}$Sr and natural radioactivity could
be significantly suppressed and would not limit the sensitivity of the
experiment with 1 kg $^{100}$Mo.

1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an