Which process is used by both historians and an archaeologist in their work

The correct answer is Radiocarbon Dating.

Explanation:

This name is given to the method used to determinate the age of an object that contains organic material. The process uses the properties of radiocarbon and it was developed in the late 1940s by Willard Libby.

Its impact is currently known as the ''radiocarbon revolution'' because this fundamental method has allowed very important transitions in prehistory to be dated.

An example of it, is that it put the bases to determinate the end of the last ice age, and the beginning of the Neolithic and Bronze Age in different regions.

The answer you are looking for is: Carbon-dating