Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Limits on Majoron-emitting double-beta decays of Xe-136 in the
  KamLAND-Zen experiment   We present limits on Majoron-emitting neutrinoless double-beta decay modes
based on an exposure of 112.3 days with 125 kg of Xe-136. In particular, a
lower limit on the ordinary (spectral index n = 1) Majoron-emitting decay
half-life of Xe-136 is obtained as T_{1/2}^{0\nu\chi^{0}} > 2.6 x 10^{24} yr at
90% C.L., a factor of five more stringent than previous limits. The
corresponding upper limit on the effective Majoron-neutrino coupling, using a
range of available nuclear matrix calculations, is <g_{ee}> < (0.8 - 1.6) x
10^{-5}. This excludes a previously unconstrained region of parameter space and
strongly limits the possible contribution of ordinary Majoron emission modes to
0\nu\beta\beta decay for neutrino masses in the inverted hierarchy scheme.

26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
19
The categories of this paper are: eess
27
The categories of this paper are: comp-gas
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The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
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The categories of this paper are: cmp-lg
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The categories of this paper are: supr-con
3
The categories of this paper are: physics