Parity-violation effect in heliumlike gadolinium and europium.
Parity-violation effect in heliumlike gadolinium and europium.
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DOI：
10.1103/physreva.63.054105
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发表时间：
2001-04
影响因子：
2.9
通讯作者：
L. Labzowsky;A. Nefiodov;G. Plunien;G. Soff;R. Marrus;D. Liesen
中科院分区：
文献类型：
--
作者：
L. Labzowsky;A. Nefiodov;G. Plunien;G. Soff;R. Marrus;D. Liesen
宇称不守恒是由类氦的Gd和Eu中原子电子与原子核的弱相互作用引起的。讨论了用极化离子束进行的实验。研究表明，Gd和Eu的混合超精细猝灭效应和弱猝灭效应导致了光子发射相对于离子束偏振的不对称性。在完全光束偏振的情况下，Gd的光子计数率不对称性的大小约为$0.39\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$，Eu的约为$0.11\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$。
Parity nonconservation that originates from the weak interaction of atomic electrons with the nuclei in heliumlike gadolinium and europium is considered. An experiment with a polarized ion beam is discussed. The mixed hyperfine- and weak-quenching effect in ${\mathrm{Gd}}^{62+}$ and ${\mathrm{Eu}}^{61+}$ isotopes is shown to lead to an asymmetry of the photon emission relative to the ion beam polarization. With complete beam polarization, the magnitude of the asymmetry in photon counting rates reaches about $0.39\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$ in gadolinium and is about $0.11\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$ in europium.