CeNTREX: a new search for time-reversal symmetry violation in the <sup>205</sup>Tl nucleus

Grasdijk, Olivier; Timgren, Oskari; Kastelic, Jakob; Wright, Trevor; Lamoreaux, S. K.; DeMille, David; Wenz, Konrad; Aitken, Michael; Zelevinsky, Tanya; Winick, Tristan; Kawall, D.

doi:10.1088/2058-9565/abdca3

Cited by 48 publications

(39 citation statements)

References 79 publications

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“…It is interesting to contrast AlF to the case of TlF, where recently it was shown that unresolved hyperfine structure in the ground state significantly limits the optical cycling rate [40]. Here, the hyperfine structure in the excited state is about 30 times larger than in AlF and the natural linewidth of the optical cycling transition is about 50 times narrower.…”

Section: Hyperfine Levelsmentioning

confidence: 95%

Optical cycling of AlF molecules

Hofsäss,

Doppelbauer,

Wright

et al. 2021

Preprint

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Aluminium monofluoride (AlF) is a promising candidate for laser cooling and trapping at high densities. We show efficient production of AlF in a bright, pulsed cryogenic buffer gas beam, and demonstrate rapid optical cycling on the Q rotational lines of the A 1 Π ↔ X 1 Σ + transition. We measure the brightness of the molecular beam to be > 10 12 molecules per steradian per pulse in a single rotational state and present a new method to determine its velocity distribution in a single shot. The photon scattering rate of the optical cycling scheme is measured using three different methods, and is compared to theoretical predictions of the optical Bloch equations and a simplified rate equation model. Despite the large number of Zeeman sublevels (up to 216 for the Q(4) transition) involved, a high scattering rate of at least 17(2) × 10 6 s −1 can be sustained using a single, fixed-frequency laser without the need to modulate the polarisation. The acceleration due to the radiation pressure force is measured by deflecting the molecular beam to 8.7(1.5) × 10 5 m/s 2 . We demonstrate that losses from the optical cycle due to vibrational branching to X 1 Σ + , v = 1 can be addressed efficiently with a single repump laser. Further, we investigate two other loss channels, parity mixing by stray electric fields and photo-ionisation. The upper bounds for these effects are sufficiently low to allow loading into a magneto optical trap.

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Section: Hyperfine Levelsmentioning

confidence: 95%

Optical cycling of AlF molecules

Hofsäss,

Doppelbauer,

Wright

et al. 2021

Preprint

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“…Searches for EDMs of diamagnetic atoms in other systems have been carried out [50][51][52][53][54]; many of these are ongoing efforts with the prospect of improving measurement accuracy by orders of magnitude, such as the radium EDM search in which several upgrades are in the process of being implemented [55,56]. There are also a number of new experiments that have the potential to explore unconstrained parameter space for symmetry violating effects in the nuclear sector [45,[57][58][59][60][61][62][63], such as the CENTREX experiment that employs a cold beam of TlF molecules [64], a search particularly sensitive to the proton EDM [65,66].…”

Section: Searches For Parity-and Time-reversal-violating Electric Dip...mentioning

confidence: 99%

Quantum Sensors for High Precision Measurements of Spin-dependent Interactions

Budker¹,

Cecil²,

Chupp³

et al. 2022

Preprint

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The applications of spin-based quantum sensors to measurements probing fundamental physics are surveyed. Experimental methods and technologies developed for quantum information science have rapidly advanced in recent years, and these tools enable increasingly precise control and measurement of spin dynamics. Theories of beyond-the-Standard-Model physics predict, for example, symmetry violating electromagnetic moments aligned with particle spins, exotic spin-dependent forces, coupling of spins to ultralight bosonic dark matter fields, and changes to the local environment that affect spins. Spin-based quantum sensors can be used to search for these myriad phenomena, and offer a methodology for tests of fundamental physics that is complementary to particle colliders and large scale particle detectors. Areas of technological development that can significantly enhance the sensitivity of spin-based quantum sensors to new physics are highlighted.

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“…8,18,21,22 The most stringent limit on an NSM results from measurements involving 199 Hg 23 . Several other NSM experiments in other atomic [24][25][26][27] and molecular 28,29 systems are also underway. The best bounds on a NMQM are obtained from (2) measurements of atomic Cs 30 .…”

Section: Introductionmentioning

confidence: 99%

Fine and hyperfine interactions in 171YbOH and 173YbOH

Pilgram

Jadbabaie

Zeng

et al. 2021

The Journal of Chemical Physics

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The odd isotopologues of ytterbium monohydroxide, 171,173 YbOH, have been identified as promising molecules in which to measure parity (P) and time reversal (T) violating physics. Here we characterize the 22 1/2 (0,0,0) (0,0,0) AX +  −  band near 577 nm for these odd isotopologues. Both laser-induced fluorescence (LIF) excitation spectra of a supersonic molecular beam sample and absorption spectra of a cryogenic buffer-gas cooled sample were recorded. Additionally, a novel spectroscopic technique based on laser-enhanced chemical reactions is demonstrated and utilized in the absorption measurements. This technique is especially powerful for disentangling congested spectra. An effective Hamiltonian model is used to extract the fine and hyperfine parameters for the 2 1/2 (0,0,0) A  and 2 (0,0,0) X +  states. A comparison of the determined 2 (0,0,0) X +  hyperfine parameters with recently predicted values (M. Denis, et al.,

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CeNTREX: a new search for time-reversal symmetry violation in the ²⁰⁵Tl nucleus

Cited by 48 publications

References 79 publications

Optical cycling of AlF molecules

Optical cycling of AlF molecules

Quantum Sensors for High Precision Measurements of Spin-dependent Interactions

Fine and hyperfine interactions in 171YbOH and 173YbOH

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CeNTREX: a new search for time-reversal symmetry violation in the 205Tl nucleus

Cited by 48 publications

References 79 publications

Optical cycling of AlF molecules

Optical cycling of AlF molecules

Quantum Sensors for High Precision Measurements of Spin-dependent Interactions

Fine and hyperfine interactions in 171YbOH and 173YbOH

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Product

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CeNTREX: a new search for time-reversal symmetry violation in the ²⁰⁵Tl nucleus