Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Raman Amplification of Matter Waves   We demonstrate a Raman amplifier for matter-waves, where the amplified atoms
and the gain medium are in two different hyperfine states. This amplifier is
based on a novel form of superradiance that arises from self-stimulated Raman
scattering in a Bose-Einstein condensate.

32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess