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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2501.05578 |
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| _version_ | 1866918060915425280 |
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| author | Grasdijk, Olivier DeMille, David Kastelic, Jakob Kawall, David Lamoreaux, Steve Timgren, Oskari Wenz, Konrad Zelevinsky, Tanya |
| author_facet | Grasdijk, Olivier DeMille, David Kastelic, Jakob Kawall, David Lamoreaux, Steve Timgren, Oskari Wenz, Konrad Zelevinsky, Tanya |
| contents | The aim of CeNTREX (Cold Molecule Nuclear Time-Reversal Experiment) is to search for time-reversal symmetry violation in the thallium nucleus, by measuring the Schiff moment of $^{205}$Tl in the polar molecule thallium fluoride (TlF). CeNTREX uses a cryogenic beam of TlF with a rotational temperature of 6.3(2) K. This results in population spread over dozens of rotational and hyperfine sublevels of TlF, while only a single level is useful for the Schiff moment measurement. Here we present a protocol for cooling the rotational and hyperfine degrees of freedom in the CeNTREX beam, transferring the majority of the Boltzmann distribution into a single rotational and hyperfine sublevel by using a single ultraviolet laser and a pair of microwave beams. We achieve a factor of $20.1(4)$ gain in the population of the $J=0$, $F=0$ hyperfine sublevel of the TlF ground state. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_05578 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Rotational-hyperfine cooling of $^{205}$TlF in a cryogenic beam Grasdijk, Olivier DeMille, David Kastelic, Jakob Kawall, David Lamoreaux, Steve Timgren, Oskari Wenz, Konrad Zelevinsky, Tanya Atomic Physics The aim of CeNTREX (Cold Molecule Nuclear Time-Reversal Experiment) is to search for time-reversal symmetry violation in the thallium nucleus, by measuring the Schiff moment of $^{205}$Tl in the polar molecule thallium fluoride (TlF). CeNTREX uses a cryogenic beam of TlF with a rotational temperature of 6.3(2) K. This results in population spread over dozens of rotational and hyperfine sublevels of TlF, while only a single level is useful for the Schiff moment measurement. Here we present a protocol for cooling the rotational and hyperfine degrees of freedom in the CeNTREX beam, transferring the majority of the Boltzmann distribution into a single rotational and hyperfine sublevel by using a single ultraviolet laser and a pair of microwave beams. We achieve a factor of $20.1(4)$ gain in the population of the $J=0$, $F=0$ hyperfine sublevel of the TlF ground state. |
| title | Rotational-hyperfine cooling of $^{205}$TlF in a cryogenic beam |
| topic | Atomic Physics |
| url | https://arxiv.org/abs/2501.05578 |