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1. Why is it impossible for two protons to fuse, as in the first step of the proton-proton cycle, without a β decay simultaneously taking place?

2. What happens to the γ rays that are emitted in stellar nuclear reactions of the protonproton or carbon cycle?

3. How would it be possible to use a neutrino detector on the earth to tell whether the dominant reactions in the center of the sun are in the proton-proton cycle or in the carbon cycle?

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