When was the first detection of the strong nuclear force in particle experiments?

The strong nuclear force was not discovered in a single experiment, but it became physically understood in the 1930s. Hideki Yukawa proposed in 1935 that a new particle could mediate the force binding protons and neutrons inside the nucleus. This idea was later supported by the discovery of the pion in 1947. The strong force is one of the four fundamental forces and is responsible for holding atomic nuclei together.