Rotation based mostly amplifier constrains hypothetical axions

Axions and axion-like particles, which have but to be recognized, could present clues to a number of the universe’s best mysteries, together with darkish matter and cost parity violation in robust interactions.

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In response to plenty of fashionable theories, axion plenty are more likely to lie in a well-motivated “axion window” (0.01 meV–1 meV). However many of the current astrophysical observations and laboratory research are centered on trying to find axions exterior the axial window.

With the assistance of a newly created spin amplifier, a analysis staff led by Prof. Xinhua Peng of the China College of Science and Expertise (USTC) of the Chinese language Academy of Sciences and Prof. Dmitry Budker of the Helmholtz Institute in Mainz was capable of discover a promising parameter area. The examine was revealed in Bodily Overview Letters journal.

The unique dipole-dipole interplay brought on by the change of axions between fermions will be noticed within the laboratory. On this examine, each the polarized nuclear spins of xeon-129 and a major variety of polarized electrons of rubidium-87 have been used as fermions.

Rubidium can produce an unique sign on the xeon’s nuclear spins by means of axion change, and the xeon-129’s polarized nuclear spins are then used to resonantly seek for the sign.

The scientists particularly demonstrated how the long-lived spins of xeon-129 operate as a quantum preamplifier that may amplify an unique sign by greater than 40 occasions. – digital coupling for the axion mass vary from 0.03 meV to 1 meV inside the axion window.

Within the axion mass area, which is theoretically intriguing, this work gives a delicate quantum methodology for understanding the oblique seek for axions with a current improved spin-based amplifier.

As a brand new implementation, the spin-based amplifier circuit expands the scope of spin measurements and can be utilized to resonantly seek for hypothetical particles past the Customary Mannequin, equivalent to new spin-1 darkish photons.

Hyperlink to the journal:

Wang, Y., and others. (2022) Constraints on axions and axion-like particles in an axion window utilizing a rotation-based amplifier.


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