Abstract
Heating by less than 10°C of heavy water was observed at room temperature upon the propagation of acoustic waves of 6 MHz with intensity of about 2 W/cm 2 during the scanning of a magnetic field from 800 to 1000 mT. A control experiment with light water did not show the heating. As a quantitative explanation of this heating, the “spin-flip phonon maser” action of deuterons due to the thermal Raman process of spin-phonon coupling is considered. Good agreement with the experimental result was obtained. The 6 MHz acoustic waves induce the pumping transitions of the nuclear spin system.
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