Abstract
Abstract The DIAS-ESTEC Ultra Heavy Cosmic Ray Experiment (UHCRE) on the Long Duration Exposure Facility (LDEF) collected approximately 3000 cosmic-ray nuclei with Z>65 in the energy region E>1.5 GeV/nucleon during a six year exposure in Earth orbit. The entire accessible collecting area of the solid-state nuclear-track detector (SSNTD) array has been scanned for actinides, yielding a sample of thirty from an exposure of ≈150 m 2 sr yr. The observed charge spectrum is presented. The current best value for the cosmic-ray actinide relative abundance, (Z>88)/(74≤Z≤87), is given. This value is considered in the context of the predictions of source/propagation models.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
