Ultracold Anions for High-Precision Antihydrogen Experiments

被引：37

作者：

Cerchiari, G. ^{[1
]}

Kellerbauer, A. ^{[1
]}

Safronova, M. S. ^{[2
,3
,4
]}

Safronova, U. I. ^{[5
]}

Yzombard, P. ^{[1
]}

机构：

[1] Max Planck Inst Nucl Phys, Saupfercheckweg 1, D-69117 Heidelberg, Germany

[2] Univ Delaware, Dept Phys & Astron, 217 Sharp Lab, Newark, DE 19716 USA

[3] NIST, Joint Quantum Inst, Gaithersburg, MD 20742 USA

[4] Univ Maryland, Gaithersburg, MD 20742 USA

[5] Univ Nevada, Dept Phys, Reno, NV 89557 USA

来源：

PHYSICAL REVIEW LETTERS | 2018年 / 120卷 / 13期

基金：

欧洲研究理事会;

关键词：

BODY PERTURBATION-THEORY; CONFIGURATION-INTERACTION;

D O I：

10.1103/PhysRevLett.120.133205

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Experiments with antihydrogen ((H) over bar) for a study of matter-antimatter symmetry and antimatter gravity require ultracold (H) over bar to reach ultimate precision. A promising path towards antiatoms much colder than a few kelvin involves the precooling of antiprotons by laser-cooled anions. Because of the weak binding of the valence electron in anions-dominated by polarization and correlation effects-only few candidate systems with suitable transitions exist. We report on a combination of experimental and theoretical studies to fully determine the relevant binding energies, transition rates, and branching ratios of the most promising candidate La-. Using combined transverse and collinear laser spectroscopy, we determined the resonant frequency of the laser cooling transition to be nu = 96.592 713(91) THz and its transition rate to be A = 4.90(50) x 10(4) s(-1). Using a novel high-precision theoretical treatment of La- we calculated yet unmeasured energy levels, transition rates, branching ratios, and lifetimes to complement experimental information on the laser cooling cycle of La-. The new data establish the suitability of La- for laser cooling and show that the cooling transition is significantly stronger than suggested by a previous theoretical study.

引用

页数：5

共 31 条

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