The Spin Contribution to the Synchrotron Light
  In order to detect the spin contribution to the synchrotron radiation, the so-called spin light, we propose to compare the characteristics of the radiation emitted by a spin-less charged particle with the huge crop of data regarding the synchrotron light, i.e. the radiation emitted by a particle endowed with a magnetic moment. Helium nuclei are proposed as the lightest stable spin-less charged particles available. 
Mario Conte
physics.acc-ph