在超导体中搜索超级筛选效果 (Search for Superscreening effect in Superconductor)

P. Ujic,F. de Oliveira Santos,M. Lewitowicz,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. Tatischef

from arxiv, 4 pages, 3 figures, accepted for publication in Physical Review Letters

The decay of $^{19}$O($\beta^-$) and $^{19}$Ne($\beta^+$) implanted in niobium in its superconducting and metallic phase 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 one-sigma error bar. This measurement casts strong doubts on the predicted strong electron screening in 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 $^{19}$Ne: 17.254(5) s.

翻译：以SPIRAL/GANIL设施产生的净化放射性波束测量了在超导体和金属相中植入的 ⁇ 的衰减量($19) O美元($\beta%-美元)和$19美元($19美元),在两个阶段测量的半衰期和分机比率在单光误差栏内是一致的。这一测量对在超导体中预测的强电子筛选,即所谓的超级筛选,产生了强烈的怀疑。在筛选潜在能量方面测量的差额是110(90) eV美元($19) Ne和400(320) eV美元($19) O. 在19美元($) O:26.476(9) s和19美元($):17.254(5) s。