Ernest Thomas Sinton Walton (6 October 1903 – 25 June 1995) was an Irish physicist and Nobel laureate for his work with John Cockcroft with “atom-smashing” experiments done at Cambridge University in the early 1930s, and so became the first person in history to artificially split the atom.
https://en.wikipedia.org/wiki/Ernest_Walton

https://en.wikipedia.org/wiki/John_Cockcroft

https://en.wikipedia.org/wiki/Ernest_Lawrence

Felix Bloch (23 October 1905 – 10 September 1983) was a Swiss physicist, working mainly in the U.S.[1] He and Edward Mills Purcell were awarded the 1952 Nobel Prize for Physics for “their development of new ways and methods for nuclear magnetic precision measurements.”[2] In 1954–1955, he served for one year as the first Director-General of CERN. Felix Bloch made fundamental theoretical contributions to the understanding of electron behavior in crystal lattices, ferromagnetism, and nuclear magnetic resonance.
https://en.wikipedia.org/wiki/Felix_Bloch

https://en.wikipedia.org/wiki/John_C._Slater

https://en.wikipedia.org/wiki/Isidor_Isaac_Rabi

https://en.wikipedia.org/wiki/Hans_Kramers

https://en.wikipedia.org/wiki/Arnold_Sommerfeld

https://en.wikipedia.org/wiki/Samuel_Goudsmit

https://en.wikipedia.org/wiki/George_Uhlenbeck