Freiburg 2024 – scientific programme

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A: Fachverband Atomphysik

A 25: Poster IV

A 25.16: Poster

Wednesday, March 13, 2024, 17:00–19:00, Tent A

Probing Axions and Axion Like Particles through Cosmic Axion Spin Precession Experiment- High-field — •Malavika Unni for the CASPEr collaboration — Helmholtz-Institut, GSI Helmholtzzentrum fuer Schwerionen-forschung, 55128 Mainz, Germany

Cosmic Axion Spin Precession Experiment (CASPEr) [1,2] investigates pseudoscalar bosons, axions, and axionlike particles (ALPs), through their interactions with standard model particles. Axions offer a solution to the formidable strong CP problem and provide a compelling link to Dark Matter. In this work, we study the coupling of the axion and ALP field with fermions. Utilizing Nuclear Magnetic Resonance (NMR) spectroscopy, we search for the coupling between Axions (and ALPs) and nuclear spins. In the CASPEr high-field setup featuring a 14.1 T magnet, we explore the frequency range of 70 to 600 MHz using tunable LC circuits cooled to cryogenic temperatures. In conjunction with a shim coil integrated into the cryostat, we employ an additional shim stack to ensure field homogeneity. We also examine various hyperpolarization techniques and identify the most suitable samples for achieving high sensitivity. Further details on our experimental setup and the NMR-detection system will be elaborated in the presentation. [1]. P. W. Graham, S. Rajendran, Phys. Rev. D 88, 035023 (2013) [2]. D. Budker, P. W. Graham, M. Ledbetter, S. Rajendran, A.O.Sushkov, Phys. Rev. X 2014.

Keywords: Darkmatter; Axions; Nuclear Magnetic Resonance; High field; Axion Like Particles