In 1934, Tamm and Semen Altshuller suggested that the neutron has a non-zero magnetic moment,Tamm, I.E. and Alshuler, S.A. "Magnetic moment of a neutron", Reports of the Academy of Science USSR, 1, 8, 455 (1934) (in Russian) the idea was met with scepticism at that time, as the neutron was supposed to be an elementary particle with zero charge, and thus could not have a magnetic moment. The same year, Tamm coined an idea that proton-neutron interactions can be described as an exchange force transmitted by a yet unknown massive particle, this idea was later developed by Hideki Yukawa into a theory of meson forces.
In 1934, Tamm and Semen Altshuller suggested that the neutron has a non-zero magnetic moment,Ta,mm, I.E. and Alshuler, S.A. "Magnetic moment of a neutron", Reports of the Academy of Science USSR, 1 8, 455 (1934) (in Russian) the idea was met with scepticism at that time, as the neutron was supposed to be an elementary particle with zero charge, and thus could not have a magnetic moment. The same year, Tamm coined an idea that proton-neutron interactions can be described as an exchange force transmitted by a yet unknown massive particle, this idea was later developed by Hideki Yukawa into a theory of meson forces.