Half of the heavy elements are produced in r-process nucleosynthesis, which is exclusively responsible for actinide production, such as Pu-244 (t$_{1/2}$=81 Myr). The r-process requires an explosive scenario but is far from being fully understood; in particular, its sites and history.
The solar system moves through the interstellar medium (ISM) and collects interstellar dust particles that...
Radioactive parts of nucleosynthesis ejecta transmit the results of nucleosynthesis in stars and supernovae from the current and most recent stellar generations. INTEGRAL observations have measured emission from the long-lived (My) isotopes 26Al and 60Fe over the past 20 years. It is a challenge to decipher these signals in the context of other patchy knowledge and models about these recent...
The astrophysical sites where r-process elements are synthesized remain mysterious: it is clear that neutron-star-mergers (kilonovae, KNe) contribute, and some classes of core-collapse supernovae (SNe) are also possible sources of at least the lighter r-process species. The discovery of $^{60}$Fe on the Earth and Moon implies that one or more astrophysical explosions have occurred near the...
