According to our current understanding of physics, it is not possible to create particles of antimatter "from nothing" or out of pure energy. The creation of antimatter typically involves high-energy processes, such as particle collisions or nuclear reactions, where energy is converted into matter-antimatter pairs.
One common method of creating antimatter involves high-energy particle accelerators. These accelerators can accelerate particles to very high speeds and energies, causing collisions that can produce particles and their antiparticles. For example, in particle colliders like the Large Hadron Collider (LHC), proton-proton collisions can produce a variety of particles, including antiparticles.
Another method involves radioactive decay. Certain radioactive materials naturally undergo decay processes that can produce antiparticles. For instance, the decay of certain isotopes can produce positrons (antielectrons).
Once antimatter is created, it can be stored and studied, but it is challenging to contain it due to the strong repulsion between particles and antiparticles. Antimatter is usually stored using sophisticated magnetic traps to prevent contact with ordinary matter, as their annihilation would release large amounts of energy.
In summary, the creation of antimatter typically requires high-energy processes such as particle collisions or nuclear reactions. While it is theoretically possible to create antimatter, it currently requires significant energy input and is a complex and challenging process.