Scientists have recently shown that a sample of cocaine can be traced to its country of origin by measuring the ration of carbon-13 to nitrogen-15 (both naturally occuring, stable nuclides) in the cocaine sample. Carbon-14 and Nitrogen-16, however, do not occur naturally and both of these nuclides undergo radioactive decay by the same process. Which type of radioactive decay is the most likely for carbon-14 and nitrogen-16?