Measurement of the E_p = 416.9 keV resonance strength in the 29Si(p,gamma)30P reaction

TL;DR

This study precisely measures the resonance strength of the 29Si(p,gamma)30P reaction at 416.9 keV, providing essential data to improve nucleosynthesis models of silicon isotopes in meteoritic grains.

Contribution

The paper presents a high-precision measurement of the resonance strength for the 29Si(p,gamma)30P reaction, reducing uncertainties in astrophysical reaction rates.

Findings

Resonance strength measured as 219 ± 16 meV.

Improved reaction rate estimations for astrophysical models.

Enhanced understanding of silicon isotope nucleosynthesis.

Abstract

Silicon isotopic ratios measured in meteoritic presolar grains can provide useful information about the nucleosynthesis origin of these isotopes if the rates of nuclear reactions responsible for their production are known. One of the key reactions determining the Si isotopic abundances is 29Si(p,gamma)30P. Its reaction rate is not known with sufficient precision due in part to some ambiguous resonance strength values. In the present work, the strength of the E_p = 416.9 keV resonance has been measured with high precision using the activation technique. The new strength of omega_gamma = 219 +- 16 meV can be used in updated reaction rate estimations and astrophysical models.