Benchmark calculations of electromagnetic sum rules with a symmetry-adapted basis and hyperspherical harmonics

0531491 - ÚJF 2021 RIV US eng J - Článek v odborném periodiku
Baker, R. B. - Launey, K. D. - Bacca, S. - Dinur, N. N. - Dytrych, Tomáš
Benchmark calculations of electromagnetic sum rules with a symmetry-adapted basis and hyperspherical harmonics.
Physical Review C. Roč. 102, č. 1 (2020), č. článku 014320. ISSN 2469-9985. E-ISSN 2469-9993
Grant CEP: GA ČR GA16-16772S
Institucionální podpora: RVO:61389005
Klíčová slova: ab intio symmetry * no-core shell model * harmonics
Obor OECD: Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)
Impakt faktor: 3.296, rok: 2020
Způsob publikování: Omezený přístup
https://doi.org/10.1103/PhysRevC.102.014320

We demonstrate the ability to calculate electromagnetic sum rules with the ab initio symmetry-adapted no-core shell model. By implementing the Lanczos algorithm, we compute nonenergy weighted, energy weighted, and inverse energy weighted sum rules for electric monopole, dipole, and quadrupole transitions in He-4 using realistic interactions. We benchmark the results with the hyperspherical harmonics method and show agreement within 2 sigma, where the uncertainties are estimated from the use of the many-body technique. We investigate the dependence of the results on three different interactions, including chiral potentials, and we report on the He-4 electric dipole polarizability calculated in the SA-NCSM that reproduces the experimental data and earlier theoretical outcomes. We also detail a novel use of the Lawson procedure to remove the spurious center-of-mass contribution to the sum rules that arises from using laboratory-frame coordinates. We further show that this same technique can be applied in the Lorentz integral transform method, with a view toward studies of electromagnetic reactions for light through medium-mass nuclei.
Trvalý link: http://hdl.handle.net/11104/0310145