Consider a universe identical to ours, but where the only difference is that the mass of the proton and the one of the neutron are the same. What would have been the neutron fraction 59 seconds after the Big Bang? Consider for the neutron a mean lifetime of 886 s. Enter your answer to 3 decimal places.

Consider a universe identical to ours, but where the only difference is that the mass of the proton and the one of the neutron are the same. What would have been the neutron fraction 59 seconds after the Big Bang? Consider for the neutron a mean lifetime of 886 s. Enter your answer to 3 decimal places.