The authors estimate the influence of the recent revisions in many reaction rates on the s-element production both in Pop. I and Pop. II intermediate mass stars during the thermally pulsing He-burning phases. In Pop. I stars, the resulting s-element distribution turns out to be clearly non solar. In order to explore the production of s-nuclei in Pop. II stars, the authors employ a new stellar model of initially 5 M_sun;, with Z = 10<SUP>-4</SUP> and Y = 0.20, whose thermally unstable He-shell phases are followed up to the sixteenth pulse. In this case the situation is even worse than in the Pop. I case. Indeed, together with the increased poisoning by light nuclei due to the revised cross sections, the authors find also a very small neutron flux, owing to the low temperature reached at the bottom of the convective He-shell.
The influence of revised nuclear reaction rates on s-element production in intermediate mass stars of pop. I and pop. II
BUSSO, Maurizio Maria;
1986
Abstract
The authors estimate the influence of the recent revisions in many reaction rates on the s-element production both in Pop. I and Pop. II intermediate mass stars during the thermally pulsing He-burning phases. In Pop. I stars, the resulting s-element distribution turns out to be clearly non solar. In order to explore the production of s-nuclei in Pop. II stars, the authors employ a new stellar model of initially 5 M_sun;, with Z = 10-4 and Y = 0.20, whose thermally unstable He-shell phases are followed up to the sixteenth pulse. In this case the situation is even worse than in the Pop. I case. Indeed, together with the increased poisoning by light nuclei due to the revised cross sections, the authors find also a very small neutron flux, owing to the low temperature reached at the bottom of the convective He-shell.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
