Physics
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....6.2235w&link_type=abstract
Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int
Physics
Scientific paper
The ECCO instrument is one of two instruments which comprise the HNX mission. The principal goal of ECCO (the Extremely-heavy Cosmic-ray Composition Observer) is to measure the age of galactic cosmic ray nuclei using the actinides (Th, U, Pu, Cm) as clocks. As a bonus, ECCO will search with unprecedented sensitivity for longlived elements in the superheavy island of stability. ECCO is an enormous array (23 m2 ) of BP-1 glass track-etch detectors, and is based on the successful flight heritage of the Trek detector which was deployed externally on Mir. We present a description of the instrument, estimates of expected performance, and recent calibrations which demonstrate that the actinides can be resolved from each other with good charge resolution. 1 Measuring GCR age using Th/U/Pu/Cm dating Dating of ancient terrestrial and solar-system material using the long-lived actinide isotopes 2 3 2 Th, 2 3 5 U and 2 3 8 U as clocks has a long and distinguished history. Recently, elemental Th/U dating has been used for the first time to measure the age of an object outside the solar system, the ultrametal poor star CS31082-001 (Cayrel et al., 2001). We plan to measure the age of the galactic cosmic rays (GCRs) using essentially the same technique, using the Extremely-heavy Cosmic-ray Composition Observer (ECCO), a giant array of BP-1 glass track-etch detectors in space. ECCO, along with ENTICE (Israel et al., 2001), are the two instruments on-
Adams James H. Jr.
Barbier Loius M.
Binns Robert W.
Christian Eric R.
Craig Nathaniel
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