Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Present status of neutrinoless double beta decay searches   Several new generation experiments searching for neutrinoless double beta
decay (0vbb) have become operational over the last five years. This report
summarizes the present status of the experimental search and discusses
peculiarities, challenges and reached half-life limits/sensitivities in these
experiments. So far, no evidence for 0vbb has been found. Starting from the
current situation, the paper addresses the question whether an experiment alone
will be able to proof unambiguously 0vbb decay and which would be the
key-requirements to succeed in this.

12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
4
The categories of this paper are: cond-mat
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph