2025/10/16 by Prézeau, Gary
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Instrumentation and Detectors (physics.ins-det) #Nuclear Experiment (nucl-ex) #Nuclear Theory (nucl-th) #Superconductivity (cond-mat.supr-con)
paper · doi:10.48550/arxiv.2510.21768
This paper reports the first non-zero measurement of a nuclear electric dipole moment using a novel method based on the rate of change of a supercurrent first proposed in 2016~\citehttps://doi.org/10.48550/arxiv.1604.02152 and fleshed out in this current paper. The theory, experimental concept and implementation are described in detail. The non-zero nuclear electric dipole moment measured with over 1000 hours of data was that of 181Ta producing a best value |deTa|=(3.39±0.31stat)⋅10-32e\cdotcm and |deTa|=(3.39±3.18)⋅10-32e\cdotcm>0 at 99.985%CL. There is an uncertainty on the value of overall multiplicative parameters such as the self-inductance of the superconducting circuit (±4%), the mutual inductance between the SQUID pickup coil and the sample wire (±15%), and the magnitude of the solenoid current (±5%). An upper-limit was estimated for the control element, 207Pb, |dePb|\lesssim1.2⋅10-31e\cdotcm at 95%CL.