Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Low Momentum Scattering in the Dirac Equation   It is shown that the amplitude for reflection of a Dirac particle with
arbitrarily low momentum incident on a potential of finite range is -1 and
hence the transmission coefficient T=0 in general. If however the potential
supports a half-bound state at k=0 this result does not hold. In the case of an
asymmetric potential the transmission coefficient T will be non-zero whilst for
a symmetric potential T=1.

16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg