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This paper is a contribution to the memorial session for Michel Borghini atthe Spin 2014 conference in Bejing, honoring his pivotal role for thedevelopment of polarized targets in high energy physics. Borghini proposed forthe first time the correct mechanism for dynamic polarization in polarizedtargets using organic materials doped with free radicals. In these amorphousmaterials the spin levels are broadened by spin-spin interactions and g-factoranisotropy, which allows a high dynamic polarization of nuclei by cooling ofthe spin-spin interaction reservoir. In this contribution I summarize theexperimental evidence for this mechanism. These pertinent experiments were doneat CERN in the years 1971 - 1974, when I was a graduate student under theguidance of Michel Borghini. I finish by shortly describing how Borghini's spintemperature theory is now applied in cancer therapy.

Borghini's Mechanism for Dynamic Polarization in Polarized Targets