Abstract
Gamow-Teller transitions in nuclei tell us that the nucleon's axial charge $g_A^{(3)}$ is quenched in large nuclei by about 20%. This result tells us that the spin structure of the nucleon is modified in nuclei and disfavours models of the medium dependence of parton structure based only on nucleon short range correlations in nuclei. For polarized photoproduction the Gerasimov-Drell-Hearn integral is expected to be strongly enhanced in medium.
Highlights
A few months earlier he contributed with a very moving personal address to Acta Physica Polonica B on the occasion of the 100 years anniversary of our journal, which has been included in the preface to the special jublee volume Acta Physica Polonica B 51, 1023 (2020)
Professor Veltman is the author of the two most quoted articles published in APPB: “Second Threshold in Weak Interactions” and “The Infrared– Ultraviolet Connection” which have gained more than 900 and 700 citations, respectively
He contributed to physics of fundamental interactions and to the developement of dedicated computer language for algebraic calculations, called Schoonschip, which paved a way for modern applications of this kind
Summary
Professor Veltman is the author of the two most quoted articles published in APPB: “Second Threshold in Weak Interactions” and “The Infrared– Ultraviolet Connection” which have gained more than 900 and 700 citations, respectively.
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