B Copenhagen Interpretation and collapse moment

[entropy1]

Is it still true that under the Copenhagen Interpretation the standard theory of QM tells us that a measurement apparatus gets into superposition of possible measurement outcomes and does not tell us how and when we get a single decisive outcome? (The so-called "Measurement problem")

 

[EPR]

Is it still true that under the Copenhagen Interpretation the standard theory of QM tells us that a measurement apparatus gets into superposition of possible measurement outcomes and does not tell us how and when we get a single decisive outcome?

This is what the MWI says. The CI assumes the measurement apparatus is never in a superposition of states. It says you get a single measurement result when you apply the Born rule(and do a measurement).

 

[Demystifier]

does not tell us how and when we get a single decisive outcome?

It doesn't tell how, but it does tell when. It's when a measurement is performed. Now if you wonder how then the time of decay is random, see my https://arxiv.org/abs/2010.07575 .