An article that presents original research, like the finding of an experiment or study, conducted by the authors is an example of what kind of source

An article that presents original research, like the finding of an experiment or study, conducted by the authors is an example of primary source.
Primary source is also called original source or evidence. It is an artifact, a document, diary,  a recording, or original research. The primary source is any source of information that was created at the time under study.