Nuclear Charge Radii of B,1110
Abstract
The first laser spectroscopic determination of the change in the nuclear charge radius for a five-electron system is reported. This is achieved by combining high-accuracy ab initio mass-shift calculations and a high-accuracy measurement of the isotope shift in the 2 s22 p 1/2P2 →2 s23 s 1/2S2 ground state transition in boron atoms. Accuracy is increased by orders of magnitude for the stable isotopes B,1110 and the results are used to extract their difference in the mean-square charge radius ⟨rc2⟩11-⟨rc2⟩10=-0.49 (12 ) fm2 . The result is qualitatively explained by a possible cluster structure of the boron nuclei and quantitatively used to benchmark new ab initio nuclear structure calculations using the no-core shell model and Green's function Monte Carlo approaches. These results are the foundation for a laser spectroscopic determination of the charge radius of the proton-halo candidate 8B.
- Publication:
-
Physical Review Letters
- Pub Date:
- May 2019
- DOI:
- 10.1103/PhysRevLett.122.182501
- arXiv:
- arXiv:1901.06323
- Bibcode:
- 2019PhRvL.122r2501M
- Keywords:
-
- Physics - Atomic Physics;
- Nuclear Theory
- E-Print:
- Phys. Rev. Lett. 122, 182501 (2019)