Measurement of the gamma-ray lines with high-pressure xenon spectrometer on board the orbital station MIR

The high pressure xenon ionisation chamber was designed for measurements gamma-ray lines from cosmic sources in the energy range 0.1 - 10 MeV. This chamber was installed on board of the orbital station "MIR" and the measurements are carried out. The 3 litter's chamber was filled with 0.6 'ifcm3 density xenon mixed with hydrogen for increasing the drift velocity of electrons. The energy resolution is 1.3% FWHM at photon energy I MeV without electronics noise (2.00/o total). This experiment has been lasting for about three years without any degradation although the detector is strongly irradiated traversing the South-Atlantic anomaly four times a day. The high energy resolution of xenon ionisation chamber made it possible to register lines in gamma-ray bursts energy spectra. Up to this time we have observed events with ~Fe* deexitation and red-shifted 511 keV annihilation lines. This experiment is carried out on board of the heavy orbital station. The distortion of measured data by the induced in vessel mass radioactivity is measured. Also we discuss the influence of vil

Keywords:

• Ionization chamber
• Annihilation
• Gamma ray
• Xenon
• Spectral line
• Drift velocity
• Photon energy
• Spectrometer
• Physics
• Nuclear magnetic resonance
• Nuclear physics
• Atomic physics
• Ionization

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