2017/09/11 by Saori Pastore, S. Pastore, A. Baroni +7 · 1 citation
Mathematics · Physics and Astronomy · #Astronomical and nuclear sciences #Mathematics #Monte Carlo method #Nuclear physics research studies #Physics #Quantum Chromodynamics and Particle Interactions #Statistical physics #Statistics #nucl-th
paper · pdf · doi:10.1103/physrevc.97.022501
published as Phys. Rev. C 97, 022501 (2018) · 6 pages, 2 figures
arxiv created 2017/09/11 · openalex created_date 2017/09/25 · openalex publication_date 2018/02/26 · arxiv updated 2018/03/07 · openalex updated_date 2026/08/05
Ab initio calculations of the Gamow-Teller (GT) matrix elements in the \ensuremathβ decays of 6He and 10C and electron captures in 7Be are carried out using both variational and Green's function Monte Carlo wave functions obtained from the Argonne v18 two-nucleon and Illinois-7 three-nucleon interactions, and axial many-body currents derived from either meson-exchange phenomenology or chiral effective field theory. The agreement with experimental data is excellent for the electron captures in 7Be, while theory overestimates the 6He and 10C data by \ensuremath∼2% and \ensuremath∼10%, respectively. We show that for these systems correlations in the nuclear wave functions are crucial to explaining the data, while many-body currents increase by \ensuremath∼2--3% the one-body GT contributions.