Joseph Chikva wrote:
500-600MeV protons hit as Iknow beryllium target.
I did not hear any other way for producing pi-mesons.
Rest mass of pi-meson (pion) 140MeV
Then they decay into muons (rest mass about 100MeV).
They need really 5000MeV for creation of each muon.
The alleged breakthrough here is some method for the efficient creation of pions, which presumably is designed to get around the energy problem you outline. However, without any details on this “breakthrough”, it’s impossible to tell how plausible it is. (The lack of detail itself may speak somewhat to the plausibility, however.)