is there really a scientific proof of life after death?
There is no proof, at least according to science.
Science does not really provide proof anyway of anything, even gravity. All science does is provide theories that seem to explain the data. No proof. If you want proof, go to mathematics, not science. This is something that people are incredibly confused about.
For example, if you look at one of the answers above, you will see why this entire subject gets so difficult. A lot of people do not know what scientific means.
To them, it just means something that they believe or something they hope might be true.
Saying something is scientific seems to give it some extra prestige. It means it is better somehow, but they don’t know what science is, they don’t know what scientific means, and they do not understand the scientific method.