title: Search for superscreening effects in a superconductor.
abstract: 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.
authors: GANIL CEA/DSM-CNRS/IN2P3, Caen, France.
authors: P
authors: P
authors: Ujić
authors: F
authors: F
authors: de Oliveira Santos
authors: M
authors: M
authors: Lewitowicz
authors: N L
authors: NL
authors: Achouri
authors: M
authors: M
authors: Assié
authors: B
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authors: Bastin
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authors: Borcea
authors: R
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authors: Borcea
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authors: Buta
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authors: Coc
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authors: de France
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authors: Kamalou
authors: J
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authors: Kiener
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authors: Lepailleur
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authors: Meot
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authors: A
authors: Pautrat
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authors: MG
authors: Saint Laurent
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authors: Sorlin
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authors: M
authors: Stanoiu
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authors: V
authors: Tatischeff