We examine the observed heavy-element abundances of two types of objects that show enrichments in s-process elements but whose abundance patterns are generally incompatible with s-process predictions: CEMP-i stars and Pb-poor post-AGB stars, with representative metallicities around and respectively. We can explain these abundance patterns, including the puzzlingly low Pb abundances of post-AGB stars, as results of i-process nucleosynthesis. To do this we use nuclear-network calculations to study heavy-element production at different constant neutron densities up to. The constraints posed by measured Pb abundances in these objects, allow us to characterise the neutron densities and exposures of the process responsible for creating the observed heavy-element abundances.
|Title of host publication||Nuclei in the Cosmos XV|
|Editors||Lucio Gialanella, Gianluca Imbriani, Alba Formicola, Matthias Junker|
|Place of Publication||Cham Switzerland|
|Number of pages||4|
|Publication status||Published - 20 Aug 2019|
|Event||International Symposium on Nuclei in the Cosmos, 2018 - Laboratori Nazionali del Gran Sasso, Assergi, Italy|
Duration: 24 Jun 2018 → 29 Jun 2018
Conference number: 15th
|Name||Springer Proceedings in Physics|
|Conference||International Symposium on Nuclei in the Cosmos, 2018|
|Abbreviated title||NIC 2018|
|Period||24/06/18 → 29/06/18|
|Other||The conference aims to address the current major achievements in nuclear physics, astrophysics, astronomy, cosmo-chemistry and neutrino physics that provide the necessary framework for any microscopic understanding of astrophysical processes, as well as for discussing the future directions and perspectives in the various fields of Nuclear Astrophysics research.|
Thus the NIC XV program will consist of invited review talks and selected oral and poster contributions on important experimental and theoretical results in nuclear, particle and astrophysics researches, as well as a detailed and thorough exposition of the modern challenges in nuclear astrophysical scenarios.
In addition a limited number of talks of more general interest about Double Beta Decay, Dark Matter, will be included in the conference program to provide an overview of different aspects of underground physics.