Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Resonant $dd\mu$ Formation in Condensed Deuterium   The rate of $dd\mu$ muonic molecule resonant formation in $d\mu$ atom
collision with a condensed deuterium target is expressed in terms of a
single-particle response function. In particular, $dd\mu$ formation in solid
deuterium at low pressures is considered. Numerical calculations of the rate in
the case of fcc polycrystalline deuterium at 3 K have been performed using the
isotropic Debye model of solid. It is shown that the energy-dependent $dd\mu$
formation rates in the solid differ strongly from those obtained for D$_2$
gaseous targets, even at high $d\mu$ kinetic energies. Monte Carlo neutron
spectra from $dd$ fusion in $dd\mu$ molecules have been obtained for solid
targets with different concentrations of ortho-D$_2$ and para-D$_2$. The
neutron time spectra calculated for pure ortho-D$_2$ and para-D$_2$ targets are
very similar.

15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat