physics

Particle experiments at Kolar Gold Fields

Particle experiments at Kolar Gold Fields is a physics topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Particle experiments at Kolar Gold Fields rather than just read about it. In short: The Kolar Gold Fields (KGF), located in the Kolar district of the state of Karnataka, India, are a set of defunct gold mines known for the neutrino particle experiments and unusual observations that took place there starting in 1960. The experiments ended with the closing of the mine in 1992.

Key takeaways

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Reference excerpt

The Kolar Gold Fields (KGF), located in the Kolar district of the state of Karnataka, India, are a set of defunct gold mines known for the neutrino particle experiments and unusual observations that took place there starting in 1960. The experiments ended with the closing of the mine in 1992.

Initial experiments The initial experiments that took place in KGF were related to the study of cosmic ray muons. KGF was chosen because the depths of its mines allowed muons to be studied in a better environment than what was possible with magnet spectrometers operated at sea level. KGF also allowed the scientists to study the energy spectrum and angular distributions of muons even at very high energies. The mines had abundance of Kolar rock whose special characteristics with respect to density and chemical composition (different from that of normal rock) were also a useful advantage in the experiments. The first experiments involving variations of muon fluxes (a measurement of muons passing through a given media) with depth was conducted by B. V. Sreekantan in 1950s. These were followed by experiments in 1961 by S. Miyake, V. S. Narasimham, P. V. Ramana Murty (also spelled Ramanamurty in some occasions), the trio sometimes called MNR, and sponsored by TIFR. During 1984, Naba Kumar Mondal, TIFR, and Prof. Ito, Osaka City University, Japan, performed experimental studies on proton decay and indirectly observed the scatter of muons. Murali and Balasubramaniam briefly assisted Mondal and Ito as research assistants.

Finding The Neutrinos Neutrino-related experiments were started in KGF in 1964. The main goal was the detection of atmospheric neutrinos, with an understanding that cosmic rays colliding with atmospheric nuclei produce high energy pions and muons, which decay in the Earth's atmosphere to produce billions of neutrinos. The experiments were conducted by groups from TIFR, Durham University and Osaka University (Bombay-Osaka-Durham collaboration) using basic trigger with scintillation counters and Neon Flash Tubes (NFT) for tracking detectors. Seven detectors were deployed at a depth of 2.3 km in Heathcote shaft and Champion Reefs mines. The experiment, using an iron calorimeter, discovered the first atmospheric neutrinos about the same time (in 1965) as a similar discovery took place in the East Rand Proprietary Mines (ERPM experiment) in South Africa. The South African experiment begun in 1965, took place 3200 meters underground and was managed by groups from Case Institute of Technology, University of California, Irvine and University of the Witwatersrand. The effort was led by Frederick Reines and the liquid scintillator detector used was called the Case-Witwatersrand-Irvine or CWI detector. Although the KGF group detected neutrino candidates two months later than Reines CWI, they were given formal priority for first discovery of atmospheric neutrinos due to publishing their findings two weeks earlier.

Kolar events Some experimental observations, called Kolar events, have yet to be explained. They suggest the existence of massive (>3 GeV) particles having a long life (10−9 secs). These massive particles are also seen to decay into 2–3 particles. It has been postulated that they could be the result of neutrino interactions or dark matter decay.

See also India-based Neutrino Observatory

References

External links KGF experiment record on INSPIRE-HEP

Illustrations

Worked examples

Example 1 — a first encounter with Particle experiments at Kolar Gold Fields

Start with the simplest possible case. Write down what Particle experiments at Kolar Gold Fields claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In physics, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Particle experiments at Kolar Gold Fields before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Particle experiments at Kolar Gold Fields ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Particle experiments at Kolar Gold Fields

In research: Particle experiments at Kolar Gold Fields appears in physics research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Particle experiments at Kolar Gold Fields in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Particle experiments at Kolar Gold Fields is common in secondary-school and first-year university syllabi. It links to neighbouring topics Particle experiments, Science and technology in Karnataka, Underground laboratories, so understanding it makes those chapters shorter.
In everyday life: Look for Particle experiments at Kolar Gold Fields outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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Frequently asked questions

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