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- W3196963413 abstract "Measuring the Cosmic X-ray Background (CXB) is a key to understand the Active Galactic Nuclei population, their absorption distribution and their average spectra. However, hard X-ray instruments suffer from time-dependent backgrounds and cross-calibration issues. The uncertainty of the CXB normalization remain of the order of 20%. To obtain a more accurate measurement, the Monitor Vsego Neba (MVN) instrument was built in Russia but not yet launched to the ISS. We follow the same ideas to develop a CXB detector made of four collimated spectrometers with a rotating obturator on top. The collimators block off-axis photons below 100 keV and the obturator modulates on-axis photons allowing to separate the CXB from the instrumental background. Our spectrometers are made of 20 mm thick CeBr$_{3}$ crystals on top of a SiPM array. One tube features a $sim$20 cm$^2$ effective area and more energy coverage than MVN, leading to a CXB count rate improved by a factor of $sim$10 and a statistical uncertainty $sim$0.5% on the CXB flux. A prototype is being built and we are seeking for a launch opportunity." @default.
- W3196963413 created "2021-09-13" @default.
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- W3196963413 date "2021-07-31" @default.
- W3196963413 modified "2023-10-17" @default.
- W3196963413 title "Measuring the Cosmic X-ray Background accurately" @default.
- W3196963413 doi "https://doi.org/10.22323/1.395.0589" @default.
- W3196963413 hasPublicationYear "2021" @default.
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