Chronology of Milestone Events in Particle Physics - VAN DYCK 1987
Chronology of Milestone Events in Particle Physics

  Nobel prize to H. G. Dehmelt and W. Paul awarded in 1989 "for the development of the ion trap technique''. Co-winner N. F. Ramsey "for the invention of the separated oscillatory fields method and its use in the hydrogen maser and other atomic clocks''  

VAN DYCK 1987

Van Dyck, R.S.; Schwinberg, P.B.; Dehmelt, H.G.;
New High Precision Comparison of Electron and Positron g Factors
Phys. Rev. Lett. 59 (1987) 26;

Abstracts
Single electrons and positrons have been alternately isolated in the same compensated Penning trap in order to form the geonium pseudoatom under nearly identical conditions. For each, the g-factor anomaly is obtained by measurement of both the spin-cyclotron difference frequency and the cyclotron frequency. A search for systematic effects uncovered a small (but common) residual shift due to the cyclotron excitation field. Extrapolation to zero power yields e+ and e- g factors with a smaller statistical error and a new particle-antiparticle comparison: g(e-)/g(e+) = 1 + (0.5 2.1) x 10-12.

Accelerator NONE Detectors PENNING-TRAP

Related references
More (earlier) information appears in
P. B. Schwinberg, R. S. van Dyck, and H. G. Dehmelt, Phys. Rev. Lett. 47 (1981) 1679;
R. S. van Dyck, P. B. Schwinberg, and H. G. Dehmelt, Phys. Rev. D34 (1986) 722;
P. B. Schwinberg, R. S. van Dyck, and H. G. Dehmelt, Phys. Lett. 81A (1981) 119;

Particles studied
  e+ mom
  e mom

Record comments
High precision measurements of electron and positron g-2 factors. High precision test of QED and CPT symmetry.
    
  New Comments List of Comments