Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Enhancement factor for two-neutron transfer reactions with a schematic
  coupled-channels model   Probabilities for two-neutron transfer reactions, $P_{\rm 2n}$, are often
discussed in comparison with the square of the corresponding probabilities for
one-neutron transfer process, $(P_{\rm 1n})^2$, implicitly assuming that
$(P_{\rm 1n})^2$ provides the probability of two-neutron transfer reactions in
the absence of the pairing correlation. We use a schematic coupled-channels
model, in which the transfers are treated as effective inelastic channels, and
demonstrate that this model leads to $P_{\rm 2n}=(P_{\rm 1n})^2/4$, rather than
$P_{\rm 2n}=(P_{\rm 1n})^2$, in the pure sequential limit. We argue that a
simple model with spin-up and spin-down neutrons in a single-particle orbital
also leads to the same conclusion.

24
The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math