These experiments involved scattering high-energy beams of electrons from protons and deuterons and heavier nuclei. Polarized beams of protons and deuterons are also available. The accelerator was used to fire heavy hydrogen nuclei "deuterons" at various targets. Titanium becomes radioactive upon bombardment with deuterons, emitting mainly positrons and hard gamma rays. In their experiments bombarding uranium with deuterons, they observed the creation of neptunium, element 93. They went on to disintegrate carbon, nitrogen and oxygen using protons, deuterons and alpha particles. Hydrogens and deuterons are not involved in recombination reactions. To produce it, they bombarded nitrogen gas with deuterons. Hydron is a generic term for hydrogen cation; protons, deuterons and tritons are all hydrons. There, he used a particle accelerator to fire heavy hydrogen nuclei (deuterons) at various targets.