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Letter-0477 · Item · 1937/06/12
Part of Archives of Wolfgang Pauli

Heisenberg comments on Bloch-Nordsieck's paper. It would be worthwhile to calculate the end of the spectrum. From papers by Anderson, Neddermayer and Blackett it seems to follow that particles exist with masses intermediate between electron and proton, and this is a plausible result. On Cosmic radiation, he says that very great showerscannot be explained by the Bhabha-Heitler formula alone.

Heisenberg, Werner
Letter-1737 · Item · 1954/03/05
Part of Archives of Wolfgang Pauli

Heisenberg replies to Pauli and Källén, in particular about "Hilbert-space II". He makes some remarks on the physical contents of his mathematical formalism.

Heisenberg, Werner
Letter-2020 · Item · 1955/02/18
Part of Archives of Wolfgang Pauli

Heisenberg replies to Pauli's question as regards the "Hilbert-space II" formalism, and the commutation relations on the light-cone. He also speculates about the importance of e$^{2}$/h.c.

Heisenberg, Werner
Letter-2407 · Item · 1956/12/01
Part of Archives of Wolfgang Pauli

Heisenberg talks about a paper by himself and Ascoli on the fine-structure constant. He comments on a paper by Källén and Glaser in which the V-particle of the Lee-model becomes radioactive, disintegrating into N and $\Theta$.

Heisenberg, Werner
Letter-2486 · Item · 1957/01/31
Part of Archives of Wolfgang Pauli

Heisenberg writes on clarification of the question of the existence of a solution for the integral equation containing a simple pole. He gives his opinion on Källén's calculations.

Heisenberg, Werner