Answer:
Hi, Since energy levels in the nucleus are much higher than those in the gas, the nucleus will cool down by emitting a more energetic electromagnetic wave called a gamma ray . Gamma ray emission causes no change in the number of particles in the nucleus meaning both the atomic number and mass number remain the same.
I'm not exactly sure but I'm thinking that it's the last one. Sorry if I'm wrong
They has been very successful but they are very expensive to operate that is your answer I hope this helps
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