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We propose a one-shot mechanism for high-energy cosmic ray generation by aneutron star falling into a black hole surrounded by low density plasma. Thefunction of the black hole in this scenario is to accelerate the star to aspeed arbitrarily close to that of light. When the star - essentially, amagnetized sphere - approaches the horizon it imparts energy to the ambientplasma charges via the induced electric field. Disregarding radiation losses,for iron nucleus, a simple estimate gives energies on the order of 10^19 eV forstars with magnetic fields as weak as 10^6 teslas. The proposed mechanismshould also work in chance encounters between rapidly moving neutron stars andmolecular clouds. The rarity of such encounters may explain the apparentrandomness and rarity of the high-energy cosmic ray events.

High-energy cosmic ray production by a neutron star falling into a black hole