what is the solution to the solar neutrino problem
In the previous two manufactures, I discussed the construction of Sun in detail. Before leaving solar physics, I want to discuss an interesting problem in Astrophysics known as The Solar Neutrino Problem. The Solar Neutrino trouble, when solved bragged the 2015 Nobel prize to Prof. Arthur B. McDonald and Prof. Taakaki Kajita. The aim of including this in Basics of Astrophysics serial is to bear witness how of import particle physics is in Astrophysics. So in this commodity, I shall tell you what are neutrinos and how are they related to the sun, and eventually the solar neutrino problem. Allow'southward understand the famous solar neutrino problem and revisit its solution.
Read all the articles of Basics of Astrophysics here
What Are Neutrinos?
Neutrinos are elementary particles of affair. They take no electric accuse and were before considered to accept no mass. Neutrinos only interact weakly with matter, which makes them very difficult to detect. Then weakly that while you lot are reading this article, trillions of neutrinos are passing through your trunk without any significant interaction. They are of 3 types: Electron neutrino, Muon neutrino, and Tau neutrino. These are the threeflavors of neutrinos.
Neutrinos Generated In The Sun:
The Sun mainly contains hydrogen gas. Co-ordinate to the standard solar model, the central temperature of the Dominicus is of the guild of 15 one thousand thousand degree Kelvin. At this temperature, the nigh important reactions are the proton-proton concatenation reactions. A uncomplicated effigy below illustrates these reactions.
Image courtesy: wikipedia
Y'all tin easily see that when a proton collides with some other proton, a neutrino is formed. The sun just produces electron neutrinos. It is theorized that nearly ane.8*ten^38 (180 trillion trillion trillion) solar neutrinos are produced every second by the Sun. This means that on World nearly 400 trillion solar neutrinos get through our torso every second. Most of these solar neutrinos have energy too low for detection. And so how can we detect them?
College energy neutrinos are rare. They have an occurrence frequency of two out of ten,000 p-p reactions. To find these solar neutrinos, we need extremely large vessels full of liquid. In these vessels, the neutrinos can exist detected via Cerenkov detectors. The previous devices were only sensitive to electron neutrinos. This is why they could detect just half the number of neutrinos that were generated in the dominicus. Where were the other half neutrinos?
This bewildered the Physicists. Particle Physicists started blaming the long standing solar model. They said that in that location is something missing in the solar model itself. Possibly the total neutrino flux that is theorized by the Solar Physicists is incorrect. Notwithstanding, the Solar Physicists were determined equally their model had successfully explained each and every aspect of the Lord's day so far.
Related in series:
Structure of Sun – I (The Temper of Sun and Corona Mystery)
Structure of Sun – II (The sunspots, solar prominences and solar current of air)
The Importance of EM Spectrum In Astrophysics
Solving The Missing Solar Neutrino Trouble:
The two neutrino detectors- Sudbury Neutrino Observatory (SNO) in Canada and the Super-Kamiokande detector in Japan played a major role in solving this puzzle. At SNO, the neutrinos from the Sun, Earth, and supernovae are detected. The electrons produced in charged-current reactions emit Cerenkov radiations every bit they travel through water. The intensity of this Cerenkov radiation is proportional to the energy of the neutrino. Using this fact, scientists tin calculate the free energy distribution of the incoming neutrinos.
Image – wikipedia
Neutrino Oscillations:
The scientists working at the Super-Kamiokande detector made a breakthrough discovery regarding the properties of neutrinos. They gave an experimental observation of neutrino oscillations. Neutrino oscillations occur when a neutrino produced with detail season later changes to a different flavor. The neutrinos take a slight mass of the lodge of 0.05-0.1 eV/c^2. Due to this slight mass, the neutrinos interact with matter. A detail neutrino may be born as an electron neutrino. It may later convert into a muon or tau neutrino and vice-versa.
Epitome – Wikipedia
The Sudbury squad compared its value of electron-neutrino flux with a very precise measurement of the total neutrino flux measurements at Super-Kamiokande. By comparing these figures, physicists from SNO and SuperKamiokande calculated the true solar-neutrino flux. It was in excellent agreement with the "standard solar model" of energy production in the Sun. Hence, the missing neutrinos were actually changing their flavors from electron to muon neutrinos. This was the reason that they escaped from the eyes of these detectors.
More in particle physics:
The standard model of particle physics
The world's outset time automobile
Understanding the Feynman diagrams
Neutrino Astrophysics
The field of particle physics that studies the origin and behaviour of the elementary particles of our universe, has always played a parallel role in unlocking the mysteries of creation. Moving in the same direction, the cuffo and weakly interacting neutrinos show out to be platonic astronomical messengers as they can travel through space without handful, absorption or deflection.
Image Courtesy : icecube.wisc.org
A few years ago, experiments at IceCube observatory discovered neutrinos that originated beyond the Lord's day with energies bracketed past those of the highest free energy gamma rays and cosmic rays. So, definitely the report and detection of neutrinos can reveal a lot about the origins of cosmic rays and about night affair. This has made the field of Neutrino astrophysics a new emerging branch of research.
Also read: viii interesting facts most Neutrinos
Author's Message
I have personally met Nobel Laureate Takaki Kajita at the 66th Lindau Meeting of Nobel Laureates and students. His wonderful talk was based on neutrino oscillations. I will non shy abroad from saying that his talk arose my involvement in this wonderful miracle of neutrino oscillations. His calmness and dedication inspired me. After interacting with him, I realized how big a project is the Super-Kamiokande detector. Huge teams of scientists have defended themselves for the Super-Kamiokande'due south proper working of such Nobel establishments.
In my Doctorate in Plasma Physics, among other phenomenon, I accept studied the neutrino axle instabilities due to neutrino oscillations in the ultra-relativistic degenerate plasma such every bit that in red giant stars (Betelgeuse), with Rishabh (founder of The Secrets Of The Universe). That's how we met!
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Source: https://www.secretsofuniverse.in/solar-neutrino-problem/
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