Direct measurement of the γHe / γXe ratio at ultralow magnetic field

8th Symposium on Frequency Standards and Metrology 2015

Fan, Isaac^1 ; Knappe-Grüneberg, Silvia^1 ; Voigt, Jens^1 ; Kilian, Wolfgang^1 ; Burghoff, Martin^1 ; Stollfuss, Detlef^1 ; Schnabel, Allard^1 ; Wübbeler, Gerd^1 ; Bodner, Olha^1 ; Elster, Clemens^1 ; Seifert, Frank^1 ; Trahms, Lutz^1

Physikalisch-Technische Bundesanstalt (PTB), Abbestrasse 2-12, Berlin

10587, Germany^1

关键词: A-stability;    Averaging time;    Comagnetometer;    Direct measurement;    Gyromagnetic ratio;    Nuclear spins;    Precision limits;    Statistical errors;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/723/1/012045/pdf
DOI  :  10.1088/1742-6596/723/1/012045

来源: IOP

【 摘 要 】

A co-located3He and129Xe nuclear spin free precession measurement at sub-μT magnetic field was carried out in a magnetically shielded environment. The uncorrected quotient of the gyromagnetic ratios between neutral3He and129Xe atoms is determined to be 2.754 082 81(07), accounting for only statistical error. Our measurement shows that this ratio has a stability of 1.4×10-5/ √τ, demonstrating the ability to reach the current precision limit of the quotient in a 10000 s of averaging time τ. This precision is enough for the next-generation EDM search in neutral129Xe atoms based on a similar comagnetometer scheme.