Class Reference: K&R Chapter 3.1 and links given in these slides NOT the FULL ppt. Look at the pdf for the lecture slides, and look here for those subset.

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Presentation transcript:

Class Reference: K&R Chapter 3.1 and links given in these slides NOT the FULL ppt. Look at the pdf for the lecture slides, and look here for those subset of pages where a link is specifically identified.

Energy Production  Standard Solar Model (see )  Predicted spectrum  Predicted fluxes, from Bahcall and Pinsonneault.Bahcall and Pinsonneault.

 Current data and comparison with standard solar model predictions  Neutrino Oscillations: a non-mathematical explanation Neutrino Oscillations  Astrophysical/nuclear physics explanations  MSW interpretation  References  Main window Naoya Hata Paul Langacker

HOMESTAKE Site : Homestake golden mine, in South Dakota, USA.Site Detector: built in 1967 at Brookhaven laboratory, it contains about 615 tons of tetrachloroethylene. Under neutrino interaction, the Chlorine 37 becomes Argon 37, which is radioactive with a half-life of 35 days. As in Gallex experiment, Argon 37 is isolated and its radioactivity is measured. The number of Argon 37 atoms detected gives the number of neutrinoDetector interactions in the chlorine vat, thus the solar neutrino flux. Results: data taken from 1969 untilResults 1993 (24 years!!) gives a mean of SNU while theory predicts 8 SNU (1 SNU = 1 neutrino interaction per second for 10E+36 target atoms). This is a neutrino deficit of 69%. Depending on the solar neutrinos experiments, the detected solar neutrinos are not in the same energy domain. Nothing forbids Homestake experiment and Gallex experiment to have compatible results.energy domain

hydrogen10,000,000sulfur95 helium1,400,000iron80 oxygen6,800argon42 carbon3,000aluminum19 neon2,800sodium17 nitrogen910calcium17 magnesium290 all other elements 50 silicon250 Number of atoms per 10,000,000 of hydrogen In the universe as a whole, hydrogen is by far the commonest element followed by helium and more distantly by heavier elements such as oxygen and carbon. Locally, the proportion of heavy elements varies from one star system to another and is an influential factor in the formation of planets.hydrogen heliumoxygencarbonformation of planets Cosmic Abundance

4 equations, 4 unknowns or Reference: