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The total cross section for interaction of slow neutrons by parahydrogen has been measured to 0.1%. A pressure dependence has been found whose origin is obscure. By extrapolation to $p=0$, a value for the coherent scattering length of (-3.707±{}0.008) ×{} 10^-13 cm is found, in agreement with the liquid-mirror result of (-3.721±{}0.004) ×{} 10^-13 cm.
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Houk et al. (1971) studied this question.
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