XIV Torino Workshop on AGB stars

Session

Nuclear reaction rates: news from laboratory measurements

10 Jun 2024, 16:30

Sala Gratton (INAF - Observatory of Rome)

27. 22Ne(α,γ)26Mg with EASγ

Daniela Mercogliano (INFN-Na & Unina)

10/06/2024, 16:30

Talk

The reaction 22Ne(α,γ)26Mg is associated with several questions in nuclear astrophysics like the Mg isotope ratio in stellar atmospheres and its competition with the neutron source 22Ne(α,n)25Mg.
Due to very low stellar energies and therefore very low cross section, direct experiments have been only able to provide upper limits below a strong resonance at 832 keV.
The purpose of the EASγ...

31. The ongoing deep underground measurement of 22Ne(a,n)25Mg at the Ion Beam Facility of the INFN-LNGS

Andreas Best (University of Naples Federico II)

10/06/2024, 16:50

Talk

The reaction 22Ne(a,n)25Mg is a nuclear reaction of critical importance for a variety of astrophysical scenarios. While much effort has been devoted on the study of the low energy cross section through indirect measurements, direct cross section and resonance measurements have been severely hampered by the low event rate.
This problem is currently being approached at the Bellotti Ion Beam...

8. $^{17}$O destruction rate

David Rapagnani (Università degli Studi di Napoli "Federico II")

10/06/2024, 17:10

Talk

When stars approach the red giant branch, a deep convective envelope develops and the products of the CNO cycle appear at the stellar surface. In particular, the $\rm ^{17}O$ is enhanced in RGB and AGB stars. Then, spectroscopic analyses of O isotopic ratios of these stars provide a powerful tool to investigate the efficiency of deep mixing processes, such as those powered by convective...