Nuclear Burning Lecture Notes

Nuclear Burning Lecture Notes

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Unformatted text preview: 8Be + e+ + νe •  CNO Cycle: –  –  –  –  à༎ 13C + e+ + νe 15O à༎ 15N + e+ + ν e 17F à༎ 17O + e+ + ν e 18F + e- à༎ 18O + ν e 13N •  AddiOonal reacOons: –  p + p + e- à༎ H + νe + νe (pep) –  3He + p + e- à༎ 4He + νe + νe (hep) February 13, 2014 ASTR 5420 Neutrino Energies February 13, 2014 Hansen, Kawaler, Trimble ASTR 5420 DetecOng Neutrinos •  Earth is transparent to neutrinos – how to detect them? •  νe + 37Cl à༎ e- + 37Ar •  37Ar has a half- life of 35 days •  Homestake Mine Experiment –  Kellogg, SD –  Raymond Davis, Jr. –  Filled a 100,000 gallon tank with 600 tons C2Cl4 (tetrachloroethylene – cleaning fluid) –  SensiOve to neutrinos >0.814 MeV –  Measured neutrino fluxes from 1970- 1988 February 13, 2014 ASTR 5420 Davis Experiment •  SNU = solar neutrino units = 10- 36 captures per second per target (less than one detecOon per day) •  Expected 7.6 +/- 1.2 SNU •  Measured 2.1 +/- 0.9 SNU •  IniOally blamed on experimental erro...
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This document was uploaded on 03/04/2014 for the course ASTR 5420 at Wyoming.

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