Decay photons from heavy ALPs produced in Wolf-Rayet stars can be probed by INTEGRAL SPI down to gaγ ~ 4e-11 GeV^-1 for ma ~ 10-100 keV, modestly extending existing limits.
IBIS/PICsIT in-flight performances
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abstract
PICsIT (Pixellated Imaging CaeSium Iodide Telescope) is the high energy detector of the IBIS telescope on-board the INTEGRAL satellite. PICsIT operates in the gamma-ray energy range between 175 keV and 10 MeV, with a typical energy resolution of 10% at 1 MeV, and an angular resolution of 12 arcmin within a \~100 square degree field of view, with the possibility to locate intense point sources in the MeV region at the few arcmin level. PICsIT is based upon a modular array of 4096 independent CsI(Tl) pixels, ~0.70 cm^2 in cross-section and 3 cm thick. In this work, the PICsIT on-board data handling and science operative modes are described. This work presents the in-flight performances in terms of background count spectra, sensitivity limit, and imaging capabilities.
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Probing Heavy Axion-like Particles from Massive Stars with X-rays and Gamma Rays
Decay photons from heavy ALPs produced in Wolf-Rayet stars can be probed by INTEGRAL SPI down to gaγ ~ 4e-11 GeV^-1 for ma ~ 10-100 keV, modestly extending existing limits.