Measurement of magnetic Moment of the electron: (a) Cryogenic system supports a 50 mK electron trap upon a 4.2 K solenoid to provide a very stable B. (b) Silver electrodes of a cylindrical Penning trap. (c) Quantum spin and cyclotron energy levels were used for measurement. Credit: Physical Review Letters (2023). DOI: 10.1103/PhysRevLett.130.071801Physicists from Havard University and Northwestern college have worked out...
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