Formalism for inclusion of measured reaction cross sections in stellar rates including uncertainties and its application to neutron capture in the s-process

TL;DR

This paper introduces a formalism to incorporate experimental reaction cross sections into stellar rate calculations, enabling better uncertainty assessment and impacting s-process nucleosynthesis modeling.

Contribution

It presents a new formalism for including measured reaction cross sections into stellar rate calculations, accounting for uncertainties and their reduction.

Findings

Revised neutron capture reactivities from KADoNiS v0.3.

Uncertainties in stellar rates are often larger than experimental errors.

Implications for s-process models and meteoritic data interpretation.

Abstract

A general formalism to include experimental reaction cross sections into calculations of stellar rates is presented. It also allows to assess the maximally possible reduction of uncertainties in the stellar rates by experiments. As an example for the application of the procedure, stellar neutron capture reactivities from KADoNiS v0.3 are revised and the remaining uncertainties shown. Many of the uncertainties in the stellar rates are larger than those obtained experimentally. This has important consequences for s-process models and the interpretation of meteoritic data because it allows the rates of some reactions to vary within a larger range than previously assumed.