Ab initio calculations of nuclear parity-violating moments and nuclear structure corrections for tests of fundamental symmetries
ORAL
Abstract
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 effort to compute nuclear structure corrections for the extraction of the Vud matrix element from the superallowed Fermi transition measurements [5] as well as calculations of two-photon exchange nuclear structure dependent corrections needed to extract nuclear radii from the measured X-ray spectra of muonic atoms. Finally, we will highlight recent calculations of the nuclear electric dipole polarizability of the 12C ground state and the first excited 2+ state, the latter needed to determine the 2+ electric quadrupole moment from Coulomb excitation experiments.
[1] B. R. Barrett, P. Navratil, J. P. Vary, Progress in Particle and Nuclear Physics 69, 131 (2013). [2] M. A. Marchisio et al., Few-Body Syst. 33, 259 (2003). [3] Y. Hao et al., Phys. Rev. A 102, 052828 (2020). [4] P. Froese and P. Navratil, Phys. Rev. C 104, 025502 (2021). [5] M. Gennari, M. Drissi, M. Gorchtein, P. Navratil, and C.-Y. Seng, arXiv:2405.19281.
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 effort to compute nuclear structure corrections for the extraction of the Vud matrix element from the superallowed Fermi transition measurements [5] as well as calculations of two-photon exchange nuclear structure dependent corrections needed to extract nuclear radii from the measured X-ray spectra of muonic atoms. Finally, we will highlight recent calculations of the nuclear electric dipole polarizability of the 12C ground state and the first excited 2+ state, the latter needed to determine the 2+ electric quadrupole moment from Coulomb excitation experiments.
[1] B. R. Barrett, P. Navratil, J. P. Vary, Progress in Particle and Nuclear Physics 69, 131 (2013). [2] M. A. Marchisio et al., Few-Body Syst. 33, 259 (2003). [3] Y. Hao et al., Phys. Rev. A 102, 052828 (2020). [4] P. Froese and P. Navratil, Phys. Rev. C 104, 025502 (2021). [5] M. Gennari, M. Drissi, M. Gorchtein, P. Navratil, and C.-Y. Seng, arXiv:2405.19281.
*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.
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Presenters
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Petr Navratil
- TRIUMF