Extended Data Table 2.

Predicted mass yields of ^204,205Pb and their ratios from Monash models for AGB stars of solar metallicity Z = 0.014

Masses are in solar units (M_⊙). M_PMZ is the free parameter in the models that leads to the formation of a ‘pocket’ rich in ¹³C, the main neutron source by means of ¹³C(α, n)¹⁶O. The absolute yields typically increase with the initial stellar mass, unless M_PMZ is decreased. The M_PMZ trend chosen here is suggested by both models and observations (see ref. ⁴⁹ for discussion). It does not affect the ²⁰⁵Pb/²⁰⁴Pb ratios, which are mostly a function of the temperature.