Search for Superscreening Effects in a Superconductor
Santos, F. de Oliveira
Achouri, Lynda N.
de France, G.
Saint Laurent, M. G.
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The decay of O-19(beta(-)) and Ne-19(beta(+)) 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 1 sigma 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 Ne-19 and 400(320) eV for O-19. Precise determinations of the half-lives were obtained for O-19, 26.476(9) s, and for Ne-19, 17.254(5) s.
Извор:Physical Review Letters, 2013, 110, 3
- Нуклеарна физика, методе и примена (RS-171018)
- European Commission within the Sixth Framework Programme through I3-EURONS [RII3-CT-2004-506065], French-Romanian Collaboration Agreement IN2P3-IFIN-HH Bucharest [03-33], Region Normandie, French-Serbian CNRS-MSCI Collaboration Agreement 
ISSN: 0031-9007 (print)