Answer:
They bombard nuclei with high-energy particles, such as protons, neutrons or alpha particles.
Step-by-step explanation:
Artificial transmutation is a process in which the changing or manipulating of nucleus happen artificially. Scientists perform artificial transmutation by bombarding nuclei with high-energy particles. Transmutation is basically conversion of one isotope or chemical element into another. Artificial transmutation is discovered in the 1901, by Rutherford and Frederick Soddy. During their experiment thorium was converting into Radium.