proton-proton reaction

proton-proton reaction

[′prō‚tän ′prō‚tän rē‚ak·shən]
(nuclear physics)
The initiating reaction in the proton-proton chain, in which two protons react to form a deuteron, a positron, and a neutrino. Abbreviated PP reaction.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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One possible interpretation of the GALLEX findings hinges on the fact that the observed capture rate is close to that predicted just for low-energy neutrinos arising from proton-proton reactions. These low-energy neutrinos may make it to Earth unchanged, whereas high-energy neutrinos, produced in other nuclear reactions involving such isotopes as boron-8 and beryllium-7, somehow transform themselves into a different form that can't be observed.