Round 9: Tossup 16

A specific form of this process that occurs for about a day maintains a state of quasi-equilibrium but not true statistical equilibrium. This process defines a stellar timescale whose numerator has a 0.007 coefficient, and is around 10-to-the-4th that of the Kelvin–Helmholtz timescale. Different mechanisms for this physical process have temperature dependencies of T-to-the-17 and (10[1])T-to-the-41. (10[1])In the Gamow window, this process is enhanced by (10[1])quantum tunneling through the Coulomb (-5[1])barrier. (10[2])This process progressively begins in increasingly outward shells, forming an onion-like structure, during evolution of massive stars. (-5[1])This process occurs to hydrogen (10[1])through the CNO cycle and the proton–proton (10[1])chain. (10[1])For 10 (10[1])points, name this process that powers stars, (10[1])in which two nuclei (10[1])combine to form a larger (10[1])nucleus. ■END■

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