Discovery of dark-state superradiance and validation of acceleration mechanism

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I proposed a new phenomena,"Dark-State Superradiance", which was a superradiance from the dark state. The radiation strength from the superradiance is proportional to the square of the number of atoms with a delay time in developing the coherence between the group of atoms. On the other hand, the darkstate superradiance was expected to have no delay time due to the original coherence between the two states in the atoms. For the discovery of the dark-state superradiance, the barium target and lasers were prepared. A transition with superradiance to utilize the coherence of the two states was succeeded, which was the step to realize the darkstate superradiance.