No, alpha particles cannot be converted into stable helium atoms because alpha particles are already made up of stable helium nuclei. An alpha particle consists of two protons and two neutrons, which is essentially the nucleus of a helium atom. This configuration is highly stable, and the alpha particle is commonly emitted during certain types of radioactive decay, such as alpha decay.
During alpha decay, a radioactive nucleus loses an alpha particle, reducing its atomic number by 2 and its mass number by 4. The remaining nucleus after the emission of an alpha particle is transformed into a different element. However, the alpha particle itself remains stable and does not undergo any further transformation into a helium atom because it already possesses the stable configuration of a helium nucleus.