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PROTON-PROTON CHAIN [1 record]
Record 1 - internal organization data 1995-06-27
Record 1, English
Record 1, Subject field(s)
- Astrochemistry and Cosmochemistry
- Astronomy
- Geochemistry
Record 1, Main entry term, English
- proton-proton chain
1, record 1, English, proton%2Dproton%20chain
correct
Record 1, Abbreviations, English
Record 1, Synonyms, English
- p-p chain 2, record 1, English, p%2Dp%20chain
correct
- proton-proton cycle 3, record 1, English, proton%2Dproton%20cycle
Record 1, Textual support, English
Record number: 1, Textual support number: 1 DEF
The nuclear process that powers the sun. It involves the fusion of nuclei in 3 kinds of collisions. The cycle starts for any one proton when it collides with another. This collision produces a deuterium nucleus, a neutrino that shoots off into space and a position that eventually annihilates a stray electron. Next, the deuterium nucleus is hit by another proton, producing a nucleus of helium -3 and a burst of gamma rays. The helium -3 hits another helium -3, producing a nucleus of inert helium and two protons. These 2 protons now start the proton-proton cycle over again. 4, record 1, English, - proton%2Dproton%20chain
Record number: 1, Textual support number: 1 CONT
Deep within the sun a series of nuclear reactions called the proton-proton chain converts hydrogen (protons) into helium by merging sets of 4 hydrogen nuclei into one helium nucleus (alpha particle). 4, record 1, English, - proton%2Dproton%20chain
Record 1, French
Record 1, Domaine(s)
- Astrochimie et cosmochimie
- Astronomie
- Géochimie
Record 1, Main entry term, French
- cycle proton-proton
1, record 1, French, cycle%20proton%2Dproton
correct, masculine noun
Record 1, Abbreviations, French
Record 1, Synonyms, French
- chaîne proton-proton 2, record 1, French, cha%C3%AEne%20proton%2Dproton
correct, feminine noun
- chaîne P-P 3, record 1, French, cha%C3%AEne%20P%2DP
correct, feminine noun
Record 1, Textual support, French
Record number: 1, Textual support number: 1 CONT
La chaîne proton-proton ne comporte que 3 étapes. Le premier mécanisme est celui des étoiles chaudes, le second celui des étoiles froides. Dans le soleil à la jonction des 2 types d'étoiles, les 2 régimes doivent fonctionner simultanément. Environ 638 millions de tonnes d'hydrogène sont transformés par seconde, dont 0.6 p. 100 est libéré sous forme d'énergie; à ce rythme, la perte de masse par seconde est de 3,83 millions de tonnes. 2, record 1, French, - cycle%20proton%2Dproton
Record number: 1, Textual support number: 2 CONT
Mais il fallut attendre 1937-1938 avant que la connaissance empirique des sections efficaces de capture ait suffisamment progressé pour permettre à Von Weizsacker et à Bethe d'isoler enfin les deux réactions responsables de la génération d'énergie dans la majorité des étoiles, la chaîne proton-proton et le cycle du carbone, toutes deux transformant quatre protons en un noyau d'hélium; mais par des processus différents. 2, record 1, French, - cycle%20proton%2Dproton
Record number: 1, Textual support number: 3 CONT
Au centre du Soleil, à 15 millions de degrés, c'est le cycle proton-proton qui est le plus efficace et contribue à l'émission d'énergie pour environ 90 p. 100. 1, record 1, French, - cycle%20proton%2Dproton
Record 1, Spanish
Record 1, Textual support, Spanish
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