Abstract

We measured the coherent neutron scattering lengths with the neutron interferometer. It was 4.7555 (0.0181) fm for natural tungsten. For 63 Cu and 65 Cu, they were 6.477(0.013) fm and 10.204(0.020) fm, respectively, while 7.7093(0.0086) fm for natural copper. It was 12.595(0.045) fm for natural mercury, and 11.002(0.043) fm for 202 Hg, which has been unknown up to now.

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