In quantum mechanics, the decay time of a particle is often assumed to be a fixed constant
In the book "a", author Ngo Quang Ha discovered the nature of decay and developed a formula for calculating the decay probability of a particle.
This helps to solve the problem of why protons are very stable, free neutrons decay easily, but are stable within the nucleus..
The book (in English) is available on Amazon: https://www.amazon.com/dp/B0HCGYPFK1
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