Search for Superscreening Effects in a Superconductor
P. Ujić, F. de Oliveira Santos, M. Lewitowicz, N. L. Achouri, M. Assié, B. Bastin, C. Borcea, R. Borcea, A. Buta, A. Coc, G. de France, O. Kamalou, J. Kiener, A. Lepailleur, V. Meot, A. Pautrat, M. G. Saint Laurent, O. Sorlin, M. Stanoiu, V. Tatischeff
DOI 10.1103/PhysRevLett.110.032501 · Physical Review Letters
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Abstract
The decay of O19(β−) and Ne19(β+) implanted in niobium in its superconducting and metallic phases 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 a 1σ error bar. This measurement casts strong doubts on the predicted strong electron screening in a superconductor, the so-called superscreening. The measured difference in screening potential energy is 110(90) eV for Ne19 and 400(320) eV for O19. Precise determinations of the half-lives were obtained for O19, 26.476(9) s, and for Ne19, 17.254(5) s.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.2 | Pressure not reported | unknown |
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