Abstract
Using a neutron interferometer the bound coherent neutron-tritium scattering length was determined tobc=5.10±0.10 fm. This yields a free scattering length ofac=3.82 ±0.07 fm. Together with the recently measured free cross section (σs=1.70±0.03 b [5, 6]) new recommended values for the singlet and triplet scattering lengths are obtained (as=3.70±0.62 fm,at=3.70±0.21 fm). These values are compared with theoretical estimates based on recent calculations for the four nucleon systems.
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