Abstract
We report on the first preliminary result of our 129Xe EDM measurement performed by the MIXed collaboration. The aim of this report is to demonstrate the feasibility of a new method to set limits on nuclear EDMs by investigating the EDM of the diamagnetic 129Xe atoms. In our setup, hyperpolarized 3He serves as a comagnetometer needed to suppress magnetic field fluctuations. The free induction decay of the two polarized spin species is directly measured by low noise DC SQUIDs, and the weighted phase difference extracted from these measurements is used to determine a preliminary upper limit on the 129Xe EDM.
Highlights
Investigating the 129Xe Electric Dipole Moments (EDM) is a different approach to improve the EDM sensitivity in the hadronic sector
The low noise DC Superconducting Quantum Interference https://doi.org/10.1051/epjconf/201921902003Devices (SQUIDs) are housed in a metal free fibre glass cryostat to maintain them on their operating temperature of about 4 K
The EDM cell of 10 cm diameter is placed between high voltage electrodes which provide an electrical field of 800 V/cm strength with switchable polarity
Summary
Investigating the 129Xe EDM is a different approach to improve the EDM sensitivity in the hadronic sector. The low noise DC SQUIDs are housed in a metal free fibre glass cryostat to maintain them on their operating temperature of about 4 K. The gradiometer configuration enables us to operate the SQUIDs √in a 400 nT magnetic field with a resolution of a few fT/ Hz, limited by noise. Within the cryostat, and within the whole setup close to the SQUIDs and the EDM cell we avoid any metal, because the Johnson noise of the free moving electrons inside a metal would induce severe magnetic noise in our SQUIDs. Below the cryostat, the housing of the EDM cell is mounted which is made of glass, covered by a slightly conductive layer to avoid charge up. The EDM cell, a pressurized air controlled valve allows for filling the EDM cell from outside
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