Are we able to create gamma rays?

We can’t ‘make’ gamma rays in a straight forward way. Naturally they come from unstable (radioactive) atomic nuclei. Gamma rays are extremely high frequency, high energy electromagnetic waves. Too energetic to be created by atomic electron transitions or high energy electron bombardment. read more

No. Gamma rays come from nuclear transformation. X-ray machines use electricity to make x-rays. It is possible to create x-rays with high enough energy to be indistinguishable from gamma rays. read more

Building gamma-ray lasers powered by an exotic hybrid of matter and antimatter may sound like science fiction, but scientists are now a step closer to doing it. Whereas the wavelengths of traditional lasers run the gamut from infrared to X-rays, a gamma-ray laser relies on light waves even smaller than X-rays. read more

In gamma-ray astronomy, "particle-particle collision" usually means a high-energy proton, or cosmic ray, strikes another proton or atomic nucleus. This collision produces, among other things, one or more neutral pi mesons (or pions). These are unstable particles that decay into a pair of gamma rays. read more