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Observation of elec...
Observation of electric-dipole transitions in the laser-cooling candidate Th- And its application for cooling antiprotons
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- Tang, Rulin (author)
- Tsinghua University
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- Si, Ran (author)
- Fudan University
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- Fei, Zejie (author)
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences
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- Fu, Xiaoxi (author)
- Tsinghua University
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- Lu, Yuzhu (author)
- Tsinghua University
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- Brage, Tomas (author)
- Lund University,Lunds universitet,Matematisk fysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Mathematical Physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
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- Liu, Hongtao (author)
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences
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- Chen, Chongyang (author)
- Fudan University
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- Ning, Chuangang (author)
- Tsinghua University
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(creator_code:org_t)
- 2021
- 2021
- English.
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In: Physical Review A. - 2469-9926. ; 103:4
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http://dx.doi.org/10...
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Abstract
Subject headings
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- Despite the fact that the laser-cooling method is a well-established technique to obtain ultracold neutral atoms and atomic cations, it has rarely if ever been applied to atomic anions due to the lack of suitable electric-dipole transitions. Efforts of more than a decade have until recently only resulted in La- as a promising anion candidate for laser cooling, but our previous work [Tang et al., Phys. Rev. Lett. 123, 203002 (2019)10.1103/PhysRevLett.123.203002] showed that Th- is also a potential candidate. Here we report on a combination of experimental and theoretical studies to determine the frequencies and rates, as well as branching ratios, for the relevant transitions in Th-. The resonant frequency of the laser-cooling transition is determined to be ν=123.455(30) THz [λ=2428.4(6)nm]. The transition rate is calculated as A=1.17×104s-1. Since the branching fraction to dark states is negligible, 1.47×10-10, this represents an ideal closed cycle in Th- for laser cooling. Furthermore, the zero nuclear spin of Th232 makes the cooling process possible in a Penning trap, which can be used to confine both antiprotons and Th- ions. The presented ion dynamics simulations show that the laser-cooled Th- anions can effectively cool antiprotons to a temperature around 10 mK.
Subject headings
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
Publication and Content Type
- art (subject category)
- ref (subject category)
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