Proton: the particle

Area of Science:

• Particle Physics
• Cosmology
• Nuclear Physics

Background:

• Protons, discovered in 1919, are fundamental baryonic subatomic particles.
• They constitute approximately 87% of the universe's baryonic mass and are present in every atom.
• Their creation dates back to the early universe, within the first second after the Big Bang.

Observation:

• Protons are composed of smaller particles, primarily quarks and gluons, a discovery made in 1968.
• Their experimentally determined lifespan is exceptionally long, exceeding 10^34 years.
• Protons have served as crucial experimental tools in discovering other particles, including various quarks and bosons.

Findings:

• Protons are the dominant baryonic particle in the universe, numbering approximately 10^80.
• The universe's elemental abundance is largely hydrogen (≈74%) and helium (≈24%), both proton-rich.
• Protons are integral to virtually all matter interactions in the visible universe.

Implications:

• Protons are vital in scientific research, enabling particle discoveries.
• Their applications span various industries and are critical in medical fields like radiation oncology and MRI.
• Understanding protons is key to comprehending the universe's composition, evolution, and fundamental interactions.