does anyone know who conducted the experiment or a credible description of the experiment that helped prove Einstein's thought experiment: the twin paradox?

as in the experiment in which one cesium-beam atomic clock stays on Earth, while another one takes flight and the time is compared between the two when the clock returns.
(not the experiment by Hafele and Keating)

Try Googling "cesium-beam atomic clock experiment" or similar. Wikipedia is also a good source for quick facts.

To find information about the experiment related to Einstein's twin paradox thought experiment, you can follow these steps:

1. Start by searching the experiment name, "Einstein's twin paradox experiment," on popular search engines like Google, Bing, or Yahoo.

2. Look for credible sources such as scientific journals, university websites, or well-known science news outlets. These sources often include detailed descriptions and information about the experiment.

3. Pay attention to the authors or organizations associated with the articles or papers you find. This will help determine the credibility of the information and the people involved in conducting the experiment.

4. Explore reputable scientific databases like PubMed, IEEE Xplore, or ScienceDirect. These databases provide access to numerous scientific articles that discuss experiments related to the twin paradox.

5. Consider searching for specific researchers or physicists who have conducted experiments related to the twin paradox. Some well-known physicists in the field include Albert Einstein himself, Herbert E. Ives, Richard Panek, and many more.

6. Utilize academic library resources if you have access to them. Many universities and institutions have subscriptions to various scientific journals, which can provide you with detailed accounts of relevant experiments.

Remember that the twin paradox is a thought experiment rather than a physical experiment that has been conducted. However, many researchers have explored variations of the twin paradox concept through experiments and simulations, which may help you find the information you are looking for.