Search for superscreening effects in a superconductor

Search for superscreening effects in a superconductor

The decay of (19)O(β(-)) and (19)Ne(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 measure...

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Veröffentlicht in:Physical review letters 2013-01, Vol.110 (3), p.032501-032501, Article 032501
Hauptverfasser: Ujić, P, de Oliveira Santos, F, Lewitowicz, M, Achouri, N L, Assié, M, Bastin, B, Borcea, C, Borcea, R, Buta, A, Coc, A, de France, G, Kamalou, O, Kiener, J, Lepailleur, A, Meot, V, Pautrat, A, Saint Laurent, M G, Sorlin, O, Stanoiu, M, Tatischeff, V
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Sprache:eng
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Zusammenfassung:The decay of (19)O(β(-)) and (19)Ne(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 (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 for (19)Ne, 17.254(5) s.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.110.032501