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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
Physical review letters, 2013-Jan-18, Volume: 110, Issue: 3Journal Article
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.
