Variation of fundamental constants and 229 Th
Variation of fundamental constants and 229 Th
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基本常数和 229 Th 的变化
DOI：
10.1142/9789813226609_0478
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Dobaczewski, Jacek
中科院分区：
文献类型：
--
作者：
Feldmeier, Hans;Litvinova, Elena;Flambaum, Victor;Dobaczewski, Jacek
核229 Th的第一激发态具有非常小的激发能7.8 eV，预计其对精细结构常数α的变化非常敏感。这两个态的库仑能相差很小，都是109 eV的量级，会将α的变化放大成跃迁频率的大变化。用Hartree-Fock和Hartree-Fock-Bogoliubov方法计算了两个态的库仑能。还计算了动能，反映了核子或夸克质量或局部洛伦兹不变性破坏的可能变化。
The first excited state of the nucleus229Th has an exceptionally small excitation energy of 7.8 eV, which is expected to be very sensitive to changes in the fine structure constant α. A small difference in the Coulomb energies of the two states, which both are of the order 109eV, would amplify variations in α into large variations of the transition frequency. Hartree-Fock and Hartree-Fock-Bogoliubov calculations are performed to compute the Coulomb energies of the two states. The kinetic energies are also calculated which reflect a possible variation in the nucleon or quark masses or local Lorentz invariance violation.