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[deleted] t1_itzf544 wrote

Reply to comment by mfb- in Would heavy unstable elements at the core of a star have a significantly extended half-life due to gravity? by SpectralMagic

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mfb- t1_itzgc2s wrote

Temperature in the Sun's core is just ~15 MK or ~1 keV, which leads to a typical gamma factor of ~1+10^(-6) for protons and ~1+5*10^(-9) for very heavy nuclei like uranium. That's a smaller effect, especially for heavy nuclei.

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Flatworldnotearth t1_itzgu7f wrote

For extremely high temperatures in of over 2.7GK required for silicon fusion for example it could have been several orders of magnitudes greater.

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mfb- t1_itzimnc wrote

2.7 GK / 15 MK = 200, so we get 1+10^(-6) for uranium. Still smaller than the gravitational effect, especially if we consider that we are now looking at the core of a far more massive star.

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Flatworldnotearth t1_itzkpwd wrote

An uranium nucleus in solar core travels at around 36km/s and in a exploding star at 3GK is around 500km/s and the Lorentz factor is around 1.0000015. Reaching the effects of gravitational time dilation as you say but the heavier the star is the more gravitational time dilation it gets. Thanks for your explanation.

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