Spin-polarized atomic hydrogen gas has been compressed to densities > 10¹⁸/cm³ with liquid ⁴He at temperatures from 0.24 to 0.67 K in magnetic fields up to 7.5 T. We find that the critical pressure, at which recombination ultimately becomes a thermally triggered explosion, goes through a maximum as a function of temperature. The explosion pressure increases with decreasing sample size and with increasing field and nuclear polarization.
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Tommila et al. (1986) studied this question.
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