5 research outputs found
Local chiral potentials and the structure of light nuclei
We present fully local versions of the minimally non-local nucleon-nucleon
potentials constructed in a previous paper [M.\ Piarulli {\it et al.}, Phys.\
Rev.\ C {\bf 91}, 024003 (2015)], and use them in hypersperical-harmonics and
quantum Monte Carlo calculations of ground and excited states of H, He,
He, He, and Li nuclei. The long-range part of these local
potentials includes one- and two-pion exchange contributions without and with
-isobars in the intermediate states up to order ( denotes
generically the low momentum scale) in the chiral expansion, while the
short-range part consists of contact interactions up to order . The
low-energy constants multiplying these contact interactions are fitted to the
2013 Granada database in two different ranges of laboratory energies, either
0--125 MeV or 0--200 MeV, and to the deuteron binding energy and singlet
scattering length. Fits to these data are performed for three models
characterized by long- and short-range cutoffs, and
respectively, ranging from fm down to
fm. The long-range (short-range) cutoff regularizes the one- and
two-pion exchange (contact) part of the potential.Comment: 29 pages, 3 figure
Nuclear Charge Radii of B
The first determination of the nuclear charge radius by laser spectroscopy
for a five-electron system is reported. This is achieved by combining
high-accuracy ab initio mass-shift calculations and a high-resolution
measurement of the isotope shift in the 2s^2 2p\, ^2\mathrm{P}_{1/2}
\rightarrow 2s^2 3s\, ^2\mathrm{S}_{1/2} ground state transition in boron
atoms. Accuracy is increased by orders of magnitude for the stable isotopes
B and the results are used to extract their difference in the
mean-square charge radius . The result is
qualitatively explained by a possible cluster structure of the boron nuclei and
quantitatively used as a benchmark for new ab initio nuclear structure
calculations using the no-core shell model and Green's function Monte Carlo
approaches