The Heavy Ions In Space (HIIS) experiment has two primary objectives: (1) to measure the elemental composition of ultraheavy galactic cosmic rays, beginning in the tin-barium region of the periodic table; and (2) to study heavy ions which arrive at LDEF below the geomagnetic cutoff, either because they are not fully stripped of electrons or because their source is within the magnetosphere. Both of these objectives have practical as well as astrophysical consequences. In particular, the high atomic number of the ultraheavy galactic cosmic rays puts them among the most intensely ionizing particles in Nature. They are therefore capable of upsetting electronic components normally considered immune to such effects. The below cutoff heavy ions are intensely ionizing because of their low velocity. They can be a significant source of microelectronic anomalies in low inclination orbits, where Earth's magnetic field protects satellites from most particles from interplanetary space. The HIIS results will lead to significantly improved estimates of the intensely ionizing radiation environment.

/pdf/preliminary-results-from-the-heavy-ions-in-space-experiment-2of72x9ztl.pdf

Preliminary results from the heavy ions in space experiment

The charge resolution that one can obtain from long duration exposures of polycarbonate solid state nuclear track detectors has been recently questioned because of the “ageing effect”, caused by time evolution of the latent tracks recorded. Several exposures of polycarbonate stacks to different energetic ultraheavy ions at the Berkeley Bevalac have been undertaken as part of a detector response study related to the Ultraheavy Cosmic Ray Experiment on board the LDEF spacecraft and to carry out latent track time evolution studies. The results indicate that there is no significant evolution of the signal recorded in polycarbonates during an ageing period of almost three years, starting 6 to 8 weeks after exposure, when the detectors are stored at temperatures ranging from − 70 to + 25 ° C. The implications of these results for the expected charge resolution from the Ultraheavy Cosmic Ray Experiment are discussed.

Long term ageing effect for energetic ultraheavy ion tracks in polycarbonate solid state nuclear track detectors

Ultra heavy ion studies with plastic nuclear track detectors. Application to cosmic rays

Abstract The effect of latent track ageing on the charge resolution that can be achieved in polycarbonate Solid State Nuclear Track Detectors exposed for long periods in space is investigated. Several exposures of polycarbonate stacks to different ultra heavy relativistic ions have been undertaken at the Berkeley Bevalac in order to study this effect. Following an increase in signal strength in the first few weeks after exposure, our results do not indicate any further significant change during a period of nearly three years. The implications of these results for the expected charge resolution from the Ultra Heavy Cosmic Ray Experiment are discussed.

Latent Track Intensification due to Ageing in Solid State Nuclear Track Detectors

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Latent Track Intensification due to Ageing in Solid State Nuclear Track Detectors