That actually does make for a fairly efficient (better than fusion in energy per unit fuel mass) reactor design in principle, but you need a sub-solar-mass black hole (in the 1 billion - 100 billion ton range), and there's no known practical way to produce one.
That actually does make for a fairly efficient (better than fusion in energy per unit fuel mass) reactor design in principle, but you need a sub-solar-mass black hole (in the 1 billion - 100 billion ton range), and there's no known practical way to produce one.