Search for Superscreening effect in Superconductor
Abstract
The decay of 19O(β-) and 19Ne(β+) implanted in niobium in its superconducting and metallic phase was measured using purified radioactive beams produced by the SPIRAL/GANIL facility. Half-lives and branching ratios measured in the two phases are consistent within one-sigma error bar. This measurement casts strong doubts on the predicted strong electron screening in superconductor, the so-called superscreening. The measured difference in screening potential energy is 110(90) eV for 19Ne and 400(320) eV for 19O. Precise determinations of the half-lives were obtained for 19O: 26.476(9) s and 19Ne: 17.254(5) s.
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