Why Does Particle Decay? | Explained with Fermi

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Discussion Overview

The discussion revolves around the concept of particle decay, specifically focusing on the decay of neutrons into protons, electrons, and antineutrinos, as explained through Fermi's perspective. The scope includes theoretical interpretations, conceptual clarifications, and the challenges of articulating complex physical phenomena.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant describes neutron decay as a process where the neutron transforms into a proton, electron, and antineutrino, suggesting that these particles are vibrations in different quantum fields that influence each other.
  • Another participant emphasizes that a neutron should not be viewed as composed of the decay products, but rather as a quantum entity that transitions between states, governed by probability.
  • A third participant argues that language is inadequate for accurately describing physical theories, stating that "why" questions about fundamental processes like neutron decay cannot be answered within physics, which relies on experimental results.
  • Another contribution highlights the necessity of mathematical descriptions for phenomena beyond direct experience, noting that understanding why a neutron decays outside of an atomic nucleus is significant for describing matter in various states.

Areas of Agreement / Disagreement

Participants express differing views on the nature of particle decay and the adequacy of language in describing physical phenomena. There is no consensus on the fundamental reasons behind neutron decay or how best to articulate these concepts.

Contextual Notes

Participants acknowledge limitations in using language to convey complex physical theories and the challenges of addressing fundamental "why" questions in physics. The discussion reflects a range of interpretations and assumptions regarding the nature of particle decay.

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For instancr like neutron decaying into proton electron and antineutrino. I read it in a book that says that according to Fermi, each of these particles are vibrations in different quantum fields and that each field exerted a tiny influence on the others. Because of quantum mechanics, we can't percieve the gradual transfer; we observe the neutrons and we either see it as a neutron, or we see that its decayed with some probability that can be calculated. Is this the reason? If is so, I don't really get what it means.
 
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What it means is that you should not picture a neutron as some how made up of proton electron and antineutrino. Rather neutron disappears and these appear. In other words neutron and the moving proton, electron and antineutrino. These two states are of the same quantum entity. These states are mutually exclusive. Either you see this or that. their individual occurrence is truly governed by the law of probability. A neutron may decay within a particular time or may not decay at all.
 
All attempts to describe physical theories with words are problematic. You can shift the problems around a bit, but English will never give an accurate description of the physics.
Also, we cannot answer "why" questions on a fundamental level. Physics can find theories that allow to calculate things like the lifetime from other observations, but "a neutron decays" is always a purely experimental result. If it would not decay, we would have to change the theories.
 
Using words to describe physical phenomena is the same as model-building; a widely accepted method in science to develop hypotheses and theories.
The problem is that we have no words or other constructs to describe physical phenomena that lie outside of our direct experience. It is in these cases that we must develop mathematical descriptions with their rigor so that everybody can understand. Why a neutron decays outside of the nucleus of an atom is big question with immediate application to describe matter in all of its states.
 

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