Looks like they discovered that the so called “ Space Quantisation” explanation for the Stern Gerlach theory was incorrect. The split beams can be explained classically. And the theoretical discreet jumps in an atoms reaction to an applied external field never materialised once technology was actually able to measure an effect so small. It seems that recent published research found that the atomic response to an applied field went up exponentially as described by a classical model. Rather than in discreet jumps as QT has erroneously claimed since 1922. More on this can be read here... https://phys.org/news/2024-12-particle-mass.html
“ When a magnetic field is applied to any material, the energy levels of electrons inside that material become quantized into discrete levels called Landau levels, Shao explained. The levels can only have fixed values, like climbing a set of stairs with no little steps in between. The spacing between these levels depends on the mass of the electrons and the strength of the magnetic field, so as the magnetic field increases, the energy levels of the electrons should increase by set amounts based entirely on their mass—but in this case, they didn't.
Using the high-powered magnet in Florida, the researchers observed that the energy of the Landau level transitions in the ZrSiS crystal followed a completely different pattern of dependence on the magnetic field strength. Years ago, theorists had labeled this pattern the "B2/3 power law," the key signature of semi-Dirac fermions. “ Yinming Shao et al 2024
