Abstract
Total scattering cross-section measurements for /sup 4/He + /sup 4/He and /sup 3/He + /sup 3/He are presented for velocities between 60 and 900 m/sec and 105 to 1000 m/sec, respectively. For /sup 4/He + /sup 4/He, a Ramsauer-Townsend effect is resolved and s and d phase shifts are obtained. The behavior of the s phase shift suggests that this system is not bound. For /sup 3/He + /sup 3/He a virtual state at 135 m/sec is resolved and some p phase shifts are obtained. A fit to the data for both pairs indicates that mass-polarization effects are negligible. (AIP)
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