Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Study of Background Conditions for Sphinx--The Satellite-Borne
  Gamma-Ray Burst Polarimeter   SPHiNX is a proposed satellite-borne gamma-ray burst polarimeter operating in
the energy range 50-500 keV. The mission aims to probe the fundamental
mechanism responsible for gamma-ray burst prompt emission through polarisation
measurements. Optimising the signal-to-background ratio for SPHiNX is an
important task during the design phase. The Geant4 Monte Carlo toolkit is used
in this work. From the simulation, the total background outside the South
Atlantic Anomaly (SAA) is about 323 counts/s, which is dominated by the cosmic
X-ray background and albedo gamma rays, which contribute ~60% and ~35% of the
total background, respectively. The background from albedo neutrons and primary
and secondary cosmic rays is negligible. The delayed background induced by the
SAA-trapped protons is about 190 counts/s when SPHiNX operates in orbit for one
year. The resulting total background level of ~513 counts/s allows the
polarisation of ~50 GRBs with minimum detectable polarisation less than 30% to
be determined during the two-year mission lifetime.

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The categories of this paper are: eess
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The categories of this paper are: chem-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: funct-an
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The categories of this paper are: gr-qc
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The categories of this paper are: cond-mat
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The categories of this paper are: chao-dyn
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The categories of this paper are: quant-ph
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The categories of this paper are: supr-con
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The categories of this paper are: econ
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The categories of this paper are: solv-int
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The categories of this paper are: dg-ga
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The categories of this paper are: patt-sol
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The categories of this paper are: adap-org
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The categories of this paper are: q-fin