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We have measured theHe⁴-He⁴ scattering cross section at 2.1 ^∘{}K by an atomic-beam method. The value found for the averaged total effective cross section Q̄eff with both beam and scattering gas at 2.1 ^∘{}K is 144 ², with an estimated accuracy of 12%. We have also measured the total effective cross section as a function of beam velocity, Qeff(v), with v ranging from 70 m/sec to 210 m/sec. These measurements were made with the scattering gas at 2.1 ^∘{}K.
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Oates et al. (1971) studied this question.
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