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Welcome to our Physics lesson on Proton and Antiproton, this is the second lesson of our suite of physics lessons covering the topic of Particles and Antiparticles - Interaction and Laws of Conservation, you can find links to the other lessons within this tutorial and access additional physics learning resources below this lesson.
After the discovery of positron as a kind of antielectron, scientists believed even more in the existence of antiproton - a particle with the same mass and spin as proton but with opposite charge. The antiproton must act in a powerful fashion when it falls in contact with the proton. As a result of this interaction there is a transformation of such a pair of particles in quants (γ-photons or π-mesons). This is why detecting antiproton in cosmic rays is very difficult. Antiprotons produced in cosmic rays encounter protons during their way and therefore they are annihilated without going to the observer. Based on the calculations, it was found that the energy needed to give the protons in order to obtain antiprotons is about 6 GeV (6 × 109 eV). This was made possible 1n 1955, when the discovery of antiproton took place. We use the symbol (p) to represent the antiproton. One of reactions that results in the generation of antiproton is:
When in contact, a proton and an antiproton are annihilated (despite not entirely, as there are antiparticles such as π-mesons obtained during this process). One of reactions that takes place during this process is:
You have reached the end of Physics lesson 21.2.2 Proton and Antiproton. There are 6 lessons in this physics tutorial covering Particles and Antiparticles - Interaction and Laws of Conservation, you can access all the lessons from this tutorial below.
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