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  11. Ab Initio Study Of The Radii Of Oxygen Isotopes

Ab Initio Study of the Radii of Oxygen Isotopes

Zhengxue Ren1,2,3, Serdar Elhatisari4,5, Ulf-G Meißner1,2,6

  • 1Forschungszentrum Jülich, Institute for Advanced Simulation (IAS-4), D-52425 Jülich, Germany.

Physical Review Letters
|October 25, 2025

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View abstract on PubMed

Summary
This summary is machine-generated.

We used nuclear lattice effective field theory to calculate oxygen isotope radii. Our findings match experimental charge radii and highlight discrepancies in experimental matter radii extraction methods.

Area of Science:

  • Nuclear Physics
  • Computational Physics

Background:

  • Accurate calculations of nuclear radii are crucial for understanding nuclear structure.
  • Previous theoretical methods faced challenges with statistical uncertainties and computational limitations.

Purpose of the Study:

  • To compute the charge and matter radii of oxygen isotopes (¹⁶O to ²⁰O).
  • To develop and apply advanced computational techniques to overcome limitations in nuclear radius calculations.

Main Methods:

  • Utilized ab initio nuclear lattice effective field theory (NLEFT).
  • Employed high-fidelity N³LO chiral interactions for precise calculations.
  • Introduced the partial pinhole algorithm to mitigate the Monte Carlo sign problem and reduce uncertainties.

Main Results:

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  • Computed charge radii for ¹⁶O, ¹⁷O, and ¹⁸O show excellent agreement with experimental data.
  • Predicted a charge radius of 2.810(32) fm for ²⁰O.
  • Calculated matter radii align well with elastic scattering data but conflict with other experimental methods, indicating model dependencies.

Conclusions:

  • NLEFT calculations provide reliable benchmarks for nuclear radii.
  • Discrepancies in experimental matter radii extraction highlight the need for refined methodologies.
  • The partial pinhole algorithm enhances the feasibility of ab initio calculations for neutron-rich and proton-rich isotopes.