The proton-proton weak capture reaction within chiral effective field theory

14th Conference on Theoretical Nuclear Physics in Italy

Marcucci, Laura E.^1

Department of Physics E. Fermi, University of Pisa, INFN-Pisa, 56127 Pisa, Italy^1

关键词: Astrophysical S factors;    Capture reaction;    Chiral effective-field theory;    Electromagnetic interactions;    Matrix elements;    Next to next to leading orders;    Proton channels;    Relative energies;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/527/1/012023/pdf
DOI  :  10.1088/1742-6596/527/1/012023

来源: IOP

【 摘 要 】

We review the results of the most recent calculation for the astrophysical S-factor of the weak proton-proton capture reaction, over a range for the center-of-mass relative energy of 0-100 keV. The so-called chiral effective field theory approach is used, where the chiral two- nucleon potential is derived up to next-to-next-to-next-to leading order and is augmented by the full electromagnetic interaction. The low-energy constants (LEC's) entering the weak current operators are fixed so as to reproduce the A 3 binding energies and magnetic moments, and the Gamow-Teller matrix element in tritium β-decay. Contributions from S and P partial waves in the incoming two-proton channel are retained. The S-factor at zero energy is found to be ∼1% larger than the value reported in the literature, mostly due to the P-waves contributions.