Speaker
Description
First principles, or ab initio, nuclear theory describes atomic nuclei as systems of nucleons interacting by QCD-based chiral effective field theory (EFT) nucleon-nucleon and three-nucleon forces. In combination with chiral EFT electroweak currents, ab initio nuclear calculations can provide model-independent results with quantifiable uncertainties relevant for precision electroweak physics.
We will discuss large-scale calculations performed within the ab initio no-core shell model (NCSM) [1] for observables requiring a computation of the nuclear Green’s function that we construct by applying the continued fraction Lanczos algorithm [2]. We will review recent results for parity violating anapole [3], electric dipole [4], and Schiff moments in light atomic nuclei. Also, we will present ongoing calculations of two-photon exchange nuclear structure dependent corrections needed to extract nuclear radii from the measured X-ray spectra of muonic atoms and highlight the effort to compute nuclear structure corrections for the extraction of the Vud matrix element from the superallowed Fermi transition measurements [5].
Supported by the NSERC Grant No. SAPIN-2022-00019. TRIUMF receives federal funding via a contribution agreement with the National Research Council of Canada. Computing support came from an INCITE Award on the Summit and Frontier supercomputers of the Oak Ridge Leadership Computing Facility (OLCF) at ORNL, from the Digital Research Alliance of Canada, and from the LLNL institutional Computing Grand Challenge Program.
[1] B. R. Barrett, P. Navratil, J. P. Vary, Progress in Particle and Nuclear Physics 69, 131 (2013). [2] M. A. Marchisio, N. Barnea, W. Leidemann, G. Orlandini, Few-Body Syst. 33, 259 (2003). [3] Yongliang Hao, Petr Navratil, Eric B. Norrgard, Miroslav Ilias, Ephraim Eliav, Rob G. E. Timmermans, Victor V. Flambaum, and Anastasia Borschevsky, “Nuclear spin-dependent parity-violating effects in light polyatomic molecules,” Phys. Rev. A 102, 052828 (2020). [4] Paul Froese and Petr Navratil, “Ab initio calculations of electric dipole moments of light nuclei,” Phys. Rev. C 104, 025502 (2021). [5] Michael Gennari, Mehdi Drissi, Mikhail Gorchtein, Petr Navratil, and Chien-Yeah Seng, “Ab initio calculation of the nuclear-structure-dependent radiative corrections in 10C superallowed transition,” Phys. Rev. Lett. 134, 012501 (2025).
| Keyword-1 | Fundamental symmetry tests |
|---|---|
| Keyword-2 | Ab initio nuclear theory |
| Keyword-3 | Electroweak interactions |
