Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High energy resolution GeV gamma ray detector   We design a GeV gamma ray detector based on an electron-positron pair
measurement by using the BESS-polar magnet and study it with the GEANT4
simulation code. We consider an additional counter to select an
electron-positron pair for which the energy loss by bremsstrahlung is less than
100 MeV against AMS. We obtain a significantly low detector efficiency of 3%.
However, an energy resolution better than 1% at 10-100 GeV is achieved by
employing a parameter that enables us to obtain a line sensitivity that is
almost indetical to that of the GLAST mission. The good energy resolution makes
it possible to obtain the three-dimensional map of the neutralino dark matter
annihilation line.

7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga