[mesa-users] ni56 beta decay rate is function of temperature? and goes to 0 for logT < 8?

[Josiah Schwab]

Hi Bill,

The tables in your original message were for positron emission.  Here is
the Ni-56 -> Co-56 electron capture.

lYeRho             leps-   electron capture;     ni56 co56
     1   -8.684   -9.164   -9.291   -9.387   -8.777   -7.439   -6.184   -5.406   -4.325   -2.782   -0.691    2.011
     2   -7.705   -8.165   -8.291   -8.387   -8.364   -7.418   -6.182   -5.406   -4.325   -2.782   -0.691    2.011
     3   -6.834   -7.171   -7.293   -7.388   -7.417   -7.212   -6.168   -5.403   -4.324   -2.782   -0.691    2.011
     4   -6.118   -6.220   -6.310   -6.392   -6.418   -6.393   -6.027   -5.372   -4.319   -2.781   -0.691    2.011
     5   -5.384   -5.388   -5.399   -5.421   -5.423   -5.395   -5.305   -5.087   -4.266   -2.773   -0.690    2.011
     6   -4.448   -4.447   -4.444   -4.432   -4.403   -4.363   -4.278   -4.170   -3.834   -2.691   -0.682    2.012
     7   -3.134   -3.134   -3.132   -3.127   -3.113   -3.091   -3.039   -2.964   -2.727   -2.093   -0.595    2.015
     8   -1.311   -1.311   -1.310   -1.305   -1.293   -1.275   -1.232   -1.177   -1.039   -0.719    0.028    2.046
     9    1.069    1.069    1.069    1.070    1.071    1.073    1.078    1.085    1.104    1.159    1.386    2.333
    10    3.035    3.034    3.034    3.034    3.035    3.035    3.036    3.037    3.040    3.048    3.084    3.420
    11    4.825    4.825    4.825    4.825    4.825    4.825    4.826    4.826    4.826    4.827    4.831    4.926

So those captures are moving along at a good clip (makes sense given the q-value).

> You caution against using tables and mention better alternatives --
> can use suggest how we should implement those in MESA?  Would you like
> to share your KEPLER implementation with us?  ;D

Table interpolation is super-dangerous at near-threshold captures, but
the table entries are sufficiently close to each other that it'll do OK
here I think.

Josiah