Physics
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990stin...9210967h&link_type=abstract
Presented at the International Conference on Trends in Astroparticle Physics, Los Angeles, CA, 28-30 Nov. 1991
Physics
Cosmic Rays, Galactic Evolution, Radiation Detectors, Solar Flux, Solar Interior, Solar Neutrinos, Detection, Nuclear Reactions, Radiation Measurement, Solar Physics, Supernovae
Scientific paper
The standard solar model predicts that the sun's luminosity has increased by 40 pct. over the past 5 Gyrs of main-sequence burning, reflecting the evolving chemistry of the solar core. This increase is accompanied by an exponential growth in the B-8 neutrino flux, with a doubling time of 0.85 Gyr. I describe an unusual nuclear system that, in principle, could yield a quantitative terrestrial record of these past changes, and discuss some of the practical obstacles to reading this record. I also argue that there exists a twin of the Cl-37 solar neutrino experiment that could be mounted with modest effort. The experiment, in which neutrinos incident on an iodine-bearing liquid produce the noble gas Xe-127, should enjoy a number of advantages over Cl-37: a substantially larger counting rate, a potentially greater relative sensitivity to Be-7 neutrinos, lower cosmic ray backgrounds, and a cleaner signal for the Xe-127 decay. I discuss the physics that could be learned from such a detector, emphasizing in particular the virtues of a passive, high counting rate experiment that could be operated cheaply over the long times that might pass before the next galactic supernova.
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