Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Neutrino-less Double Beta Decay of 48Ca studied by CaF2(Eu)
  Scintillators   We searched for the neutrino-less double beta decay(0nbb) of 48Ca by using
CaF2(Eu) scintillators. Analysis of their pulse shapes was effective to reduce
backgrounds. No events are observed in the Q-value region for the data of 3394
kg days. It gives a lower limit (90% confidence level) of T > 2.7 x 10^22 year
for the half life of 0nbb of 48Ca. Combined with our previous data for 1553 kg
days, we obtained more stringent limit of T > 5.8 x 10^22 year.

37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
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The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat