According to this picture the Alpha particles in a cloud chamber are straight lines.
https://en.wikipedia.org/wiki/Cloud_chamber#/media/File:Cloud_chamber_bionerd.jpg
This is natural because this particles are approx. 4000 times heavier than electrons and the small size of the chamber respectively the relatively weakness of the magnetic field. My question is, was done an experiment with only Alpha particles in a homogeneous magnetic field and measured the deflection?
BTW the same question about neutrons and the evidence that the are not deflected undr the influence of an external magnetic field.
(There isn't a tag for Lorentz force)
Answer
Related question Is an alpha particle's curvature in a magnetic field visible with a homemade cloud chamber?
You give no link for your photo and no details about the magnetic field imposed on the cloud chamber. Here is the case of alpha particles in a strong magnetic field:
An alpha particle is not readily deflected by a magnetic field. For this cloud chamber photograph a field of more than 4 Tesla was used (directed down into the picture.)
Neutrons are not charged and therefore their passage leaves no trace in a cloud chamber. The only interaction with a magnetic field would be through their magnetic moment and that is how the spin of the neutron was measured.
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