Search for Superscreening effect in Superconductor

Abstract : The decay of $^{19}$O($\beta^-$) and $^{19}$Ne($\beta^+$) 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 $^{19}$Ne and 400(320) eV for $^{19}$O. Precise determinations of the half-lives were obtained for $^{19}$O: 26.476(9)~s and $^{19}$Ne: 17.254(5)~s.
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P. Ujic, F. de Oliveira Santos, M. Lewitowicz, N.L. Achouri, M. Assié, et al.. Search for Superscreening effect in Superconductor. Physical Review Letters, American Physical Society, 2013, 110, pp.032501. ⟨10.1103/PhysRevLett.110.032501⟩. ⟨in2p3-00765510⟩

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