This scientist initiated the theory of proton and electron showers in cosmic rays and helped to resolve contradictions in the nuclear mass scale.  With Marshak, he predicted the discovery of the pi meson and later worked on that meson's production by electromagnetic radiation.  With Peirels, he developed a theory of the deuteron and also worked with Heitler to calculate the bremsstrahlung emitted by relativistic electrons . The first to explain the hydrogen spectrum's Lamb shift, he applied group theory and quantum mechanics to electrostatic theory to develop crystal field theory.  FTP, identify this German-American physicist who, independently of Carl Weizsacker, discovered the carbon-nitrogen cycle and proton-proton reactions that power s
This scientist initiated the theory of proton and electron showers in cosmic rays and helped to resolve contradictions in the nuclear mass scale.  With Marshak, he predicted the discovery of the pi meson and later worked on that meson's production by electromagnetic radiation.  With Peirels, he developed a theory of the deuteron and also worked with Heitler to calculate the bremsstrahlung emitted by relativistic electrons . The first to explain the hydrogen spectrum's Lamb shift, he applied group theory and quantum mechanics to electrostatic theory to develop crystal field theory.  FTP, identify this German-American physicist who, independently of Carl Weizsacker, discovered the carbon-nitrogen cycle and proton-proton reactions that power stars, work for which he won the 1967 Nobel prize in Physics.
This scientist initiated the theory of proton and electron showers in cosmic rays and helped to resolve contradictions in the nuclear mass scale.  
Hans Bethe