= Hans Albrecht Bethe
{c}
{tag=Physicist}
= Hans Bethe
{c}
{synonym}
= Hans A. Bethe
{c}
{synonym}
= H. A. Bethe
{c}
{synonym}
<Hans Bethe> connected laboratory <nuclear reactions> with the sustained power of <stars>. With <Charles Critchfield>, he calculated the slow two-<proton> reaction that begins the <proton–proton chain>, treating both barrier penetration and the nuclear transition.<The Formation of Deuterons by Proton Combination by Hans Albrecht Bethe and Charles Louis Critchfield>[1938 abstract, reaction probability and solar-energy comparison]{ref} His 1939 analysis also developed hydrogen-burning reactions in which <carbon> and <nitrogen> nuclei act as intermediate carriers and are regenerated. The net conversion releases energy by turning <hydrogen> into <helium>; the intermediate nuclei provide a cycle rather than a fuel supply that is consumed once.<Energy Production in Stars by Hans Albrecht Bethe (1939)>[Hydrogen-burning reactions and carbon–nitrogen cycle]{ref}
A <physicist>.https://news.cornell.edu/stories/2005/03/hans-bethe-titan-physics-and-conscience-science-dies-age-98[Independent professional profile]{ref}https://physics.cornell.edu/bethe-lectures[Independent professional profile]{ref}
\Image[https://upload.wikimedia.org/wikipedia/commons/5/5f/Hans_Bethe.jpg]
{title=Portrait of <Hans Albrecht Bethe>}
{width=240}
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