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J/ApJS/156/69 MGGPOD Monte Carlo suite (Weidenspointner+, 2005)
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Beginning of ReadMe :J/ApJS/156/69 MGGPOD Monte Carlo suite (Weidenspointner+, 2005)
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MGGPOD: a Monte Carlo suite for modeling instrumental line and continuum
backgrounds in gamma-ray astronomy.
Weidenspointner G., Harris M.J., Sturner S., Teegarden B.J., Ferguson C.
<Astrophys. J. Suppl. Ser., 156, 69-91 (2005)>
=2005ApJS..156...69W
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ADC_Keywords: Gamma rays ; Spectroscopy ; Models
Keywords: gamma rays: observations - instrumentation: miscellaneous -
line: identification - methods: data analysis - methods: numerical
Abstract:
Intense and complex instrumental backgrounds, against which the much
smaller signals from celestial sources have to be discerned, are a
notorious problem for low- and intermediate-energy gamma-ray
astronomy ( 50keV-10MeV). Therefore, a detailed qualitative and
quantitative understanding of instrumental line and continuum
backgrounds is crucial for most stages of gamma-ray astronomy
missions, ranging from the design and development of new
instrumentation through performance prediction to data reduction. We
have developed MGGPOD, a user-friendly suite of Monte Carlo codes
built around the widely used GEANT (ver. 3.21) package, to simulate ab
initio the physical processes relevant for the production of
instrumental backgrounds. These include the build-up and delayed decay
of radioactive isotopes as well as the prompt de-excitation of excited
nuclei, both of which give rise to a plethora of instrumental
gamma-ray background lines in addition to continuum backgrounds. The
MGGPOD package and documentation are publicly available online
(http://sigma-2.cesr.fr/spi/MGGPOD/). We demonstrate the capabilities
of the MGGPOD suite by modeling high-resolution gamma-ray spectra
recorded by the Transient Gamma-Ray Spectrometer (TGRS) on board Wind
during 1995. The TGRS is a Ge spectrometer operating in the 40keV-8MeV
range. Because of its fine energy resolution, these spectra reveal the
complex instrumental background in formidable detail, particularly the
many prompt and delayed gamma-ray lines. We evaluate the successes
and failures of the MGGPOD package in reproducing TGRS data and
provide identifications for the numerous instrumental lines.