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CNO cycle

CNO cycle. Ne(10). CN cycle (99.9%). O Extension 1 (0.1%). F(9). O Extension 2. O(8). O Extension 3. N(7). C(6). 3. 4. 5. 6. 7. 8. 9. neutron number. Energetics: Q = Q 4p 4He – E n = 26.73 MeV – 0.706 MeV – 0.996 MeV = 25.028 MeV. 13 N( b +). 15 O( b +).

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CNO cycle

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  1. CNO cycle Ne(10) CN cycle (99.9%) O Extension 1 (0.1%) F(9) O Extension 2 O(8) O Extension 3 N(7) C(6) 3 4 5 6 7 8 9 neutron number Energetics: Q = Q4p4He – En = 26.73 MeV – 0.706 MeV – 0.996 MeV = 25.028 MeV 13N(b+) 15O(b+) All initial abundances within a cycle serve as catalysts and accumulate at largest t Extended cycles introduce outside material into CN cycle (Oxygen, …

  2. ColdCNO cycle Hot CNO cycle

  3. CNO cycle abundance evolution into steady state (from Iliadis)

  4. Competition between the p-pchain and the CNO Cycle The main reason are different slopes due to different temperaturedependencies of p+p and 14N(p,g)

  5. Competition between the p-pchain and the CNO Cycle But exact cross over also depends on other variables: • So in addition to the reaction rates the ratio depends on • initial CN abundance YCNinitial • current H abundance Yp • different neutrino loss fractions

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