Mathematics
Scientific paper
Feb 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976phdt.........1h&link_type=abstract
Ph.D. Thesis - Maryland Univ. National Aeronautics and Space Administration. Goddard Space Flight Center, Greenbelt, MD.
Mathematics
14
Beryllium 10, Chronology, Cosmic Rays, Abundance, Balloon-Borne Instruments, Cerenkov Counters, Mass Distribution, Mathematical Models, Radioactive Decay, Scintillation Counters
Scientific paper
The isotopic composition of cosmic ray Be, B, C, and N was studied using a new range versus total light technique. Special emphasis was placed on the Be isotopes and in particular, on the radioactive isotope Be-10 due to its mean lifetime against decay. The experiment consisted of a thin trigger scintillator, an acrylic plastic Cerenkov detector and a spark chamber, followed by a totally active stack of 14 scintillation detectors. This stack of scintillators made possible the measurement of range, and also permitted the removal of interacting events by continuously monitoring their identities along their trajectories. The experiment was carried by balloon to atmospheric depths ranging from 3.5 to 5.0 g sq cm residual atmosphere for a total exposure time of 23 hr. Results indicate the survival of ( 55 + or -21) % of the Be-10 in the arriving cosmic rays; the data were interpreted using the leaky box model of cosmic ray propagation.
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