the double-slit experiment has not been conducted with a gradual division of the initial slit into two slits. The standard double-slit experiment involves a barrier with two parallel slits through which particles, such as electrons or photons, pass. This setup allows for the observation of wave-particle duality, where particles exhibit both wave-like and particle-like behaviors.
However, if there have been any recent developments or modifications to the experiment, I might not be aware of them. It's always a good idea to consult the latest scientific literature or research to find the most up-to-date information on experiments and their outcomes.