Here is the question, Try to think that your five senses are suspended temporarily. Will you be still able to feel your sorroundings ? Will you be able communicate/love with your near and dear ones ? Will you be conscious of your existence or Will you be like a dead body ?
The answer to the question: "How to prove existence of soul scientifically ? " is a simple one. You measure someone before he dies and immediately after. The soul has weight and when the soul leaves the body, the dead body becomes lighter. Simple
actually after death the body becomes heavier, not lighter, so the rather odd suggestion that we weigh a body after death and presumably it gets lighter just wouldn't work. and anyway isn't the soul supposed to be ethreal and therefore not of this world, so weightless. in any case you cannot scientifically prove that there is a soul. it is not possible.