Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exact evaluation of the nuclear form factor for new kinds of majoron
  emission in neutrinoless double beta decay   We have developed a formalism, based on the Fourier-Bessel expansion, that
facilitates the evaluation of matrix elements involving nucleon recoil
operators, such as appear in serveral exotic forms of neutrinoless double beta
decay ($\beta\beta_{0\nu}$). The method is illustrated by applying it to the
``charged'' majoron model, which is one of the few that can hope to produce an
observable effect. From our numerical computations within the QRPA performed
for $^{76}Ge$, $^{82}Se$, $^{100} Mo$, $^{128}Te$ and $^{150}Nd$ nuclei, we
test the validity of approximations made in earlier work to simplify the new
matrix elements, showing that they are accurate to within 15%. Our new method
is also suitable for computing other previously unevaluated $\beta\beta_{0\nu}$
nuclear matrix elements.

16
The categories of this paper are: stat
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol