Theory 16/Cosmochemistry
Grains Survive a Ratio
The claim
The survival of presolar grains through a shock is set by the ratio of shock duration to diffusion time rather than by peak temperature.
01The mechanism
Destruction requires enough time at temperature for diffusion to alter the grain; a short hot pulse can be survived where a long mild one cannot.
02Predictions
- P1Survival should track the time ratio.
- P2Peak temperature alone should mispredict.
03Refutation
Survival tracking peak temperature would remove the diffusion term.