Neutrino Oscillations and the Solar Neutrino Puzzle (Lecture - 09) by Professor G Srinivasan

Summer course 2018 - A Random walk in astro-physics
Lecture - 09 : Neutrino Oscillations and the Solar Neutrino Puzzle
by Professor G Srinivasan, Raman Research Institute (Retired)
10.00 to 12.00 Friday, 18 May 2018
Madhava Lecture Hall, ICTS Bangalore
The range of densities, temperatures, magnetic fields, etc. that obtain in the Universe are staggering: from 10-27 g cm-3 to 1015 g cm-3, from 3K to 1010 K, from 10-6 G to 1015 G. Not surprisingly, the variety of physical phenomena one encounters during the study of celestial objects is truly impressive. This set of lectures is intended to illustrate the richness of Astrophysics. It will be a random walk in basic physics, with numerous illustrations from astronomy. The topics in physics that will be reviewed have been chosen on the basis of their importance in contemporary astronomy.
Topics:
Absorption and emission of radiation
Radiation from relativistic electrons
Compton scattering of radiation
Spontaneous and stimulated emission
Hyperfine splitting of energy levels
Molecular spectra
Astrophysical plasma.
Quantum tunnelling.
Nuclear matter
Neutrino Oscillation
Phase transitions and the early Universe
During this random walk in physics, one will encounter a range of astronomical objects and phenomena, such as, Solar wind, gaseous nebulae, interstellar hydrogen clouds, giant molecular clouds, neutron stars and pulsars, supernova remnants, radio galaxies and quasars, active galactic nuclei, the cosmic microwave background, etc.
www.icts.res.in/summercourse2018
Table of Contents (powered by videoken.com)
0:00:00 Summer course 2018 - A Random walk in astro-physics
0:00:10 Neutrino Oscillation and the Solar Neutrino Puzzle (Lecture-09)(Lecture - 09)
0:00:28 The case of the Missing Neutrinos
0:00:44 Radioactivity and B-decay
0:04:11 The Neutrino (1930)
0:06:56 Fermi's theory of B - Decay
0:10:47 The Neutrino family
0:12:41 Mean free path of the neutrinos
0:15:14 The fusion of hydrogen into helium
0:16:40 The proton - proton chain reaction
0:18:15 Branch 1 (85 percent):
0:22:55 How do we know that all this is true?
0:25:13 The brave warriors!
0:26:06 Raymond Davis Experiment
0:31:02 Davis' Experiment: First results, 1968
0:34:31 What was wrong?
0:36:14 The Neutrino family
0:37:14 Something happened on the way to the earth?
0:37:51 Neutrino Oscillations
0:39:44 The Solar Neutrino Puzzle
0:40:57 The experiment was refined and refined!
0:41:48 New experiments were planned
0:42:58 The Gallium Experiments
0:45:46 Neutrino-electron scattering experiments
0:49:42 Kamiokande II Experiment
0:50:53 Kamiokande II Results
0:51:46 The Super-Kamiokande Detector
0:52:42 Three men in a boat!
0:53:06 The Super-Kamiokande Results
0:53:40 Amount of electron neutrinos expected
0:55:13 The missing solar neutrinos
0:55:57 Could the standard model of the Sun be wrong?
0:57:18 Helioseismology
0:58:52 The atmospheric neutrinos
0:59:22 Atmospheric Neutrinos
1:01:54 Super Kamiokande experiment to detect the atmospheric neutrinos
1:03:12 The atmospheric neutrinos
1:04:29 Atmospheric neutrino data from Super Kamikande expt.
1:05:46 Expected number without oscillation
1:07:18 Atmospheric neutrino experiment had proved neutrino oscillations.
1:09:06 Expected Ve from the Sun
1:09:50 To find the 'smoking gun'
1:10:49 The Sudbury Neutrino Observatory
1:13:08 Neutrino Absorption in Heavy water
1:15:17 Neutrino - Electron scattering:
1:15:48 Deuteron break up: v + d =n+ +v
1:16:51 Actual data of a candidate neutrind event
1:17:11 Background events
1:20:18 The Sudbury Results
1:21:57 The Sensational Sudbury Results
1:25:36 Nobel Prize 1995
1:26:34 Nobel Prize, 2002
1:27:00 Nobel Prize for Physics - 2015
1:27:29 Neutrino Oscillation
1:33:36 Circularly Polarized Light
1:39:09 The time evolution of an electron neutrino state may now be expressed as
1:40:43 Oscillation probabilities between two neutrino flavors
1:41:48 The mystery is solved!
1:42:06 Epilogue
1:46:12 Next Lecture: Quantum Stars
1:46:19 Q&A

[@dnranjit]

An accomplished physicist and an even remarkable story teller.

[@coastwalker101]

A cracking story well told.

[@henryj.8528]

Well researched and well presented. He's absolutely right about the impact of Fermi's theory of beta decay on modern particle physics.

[@pabitrasen3136]

In the last lecture, Srini told us that lots of neutrinos are produced in the nuclear reactions in the Sun's core, and they are the true witnesses, since they interact weakly with matter. These witnesses all should arrive unimpeded from the Sun to the Earth. But do some go missing? If you want to get a comprehensive picture of what is the big deal with the missing neutrinos puzzle, this is the only place you need to go. Srini takes you through the labyrinth of a dizzying array of neutrino sources in the Sun and the phenomenal agreement between experiment and theory. A 1% error in the temperature corresponds to about a 30% error in the predicted number of neutrinos!! Pontecorvo (1967) makes a prophetic proposal that neutrinos might oscillate, or change, flavors. Srini explains the theory and gives you a clear picture of unbelievably humongous yet meticulous experiments that lead to the discovery of neutrino oscillations. A clear explanation of the definitive Sudbury Solar Neutrino Observatory (SNO) experiment. This oscillation demonstrates that the neutrinos have mass. What does that mean for standard models?

[@Only1INDRAJIT]

Where is his lecture on the Big Bang???

[@ganesansrinivasan6063]

it will be released after 15 July 2018.

[@ramankumar-kk9sl]

kzbin.info/www/bejne/fpO6dJ5thN1sl7s is the lecture on big bang