Accurate nucleon-nucleon potential with charge-independence breaking

Abstract

We present a new high-quality nucleon-nucleon potential with explicit charge dependence and charge asymmetry, which we designate Argonne v 18 . The model has a charge-independent part with fourteen operator components that is an updated version of the Argonne v 14 potential. Three additional chargedependent and one charge-asymmetric operators are added, along with a complete electromagnetic interaction. The potential has been fit directly to the Nijmegen pp and np scattering data base, low-energy nn scattering parameters, and deuteron binding energy. With 40 adjustable parameters it gives a 1 χ 2 per datum of 1.09 for 4301 pp and np data in the range 0-350 MeV.

Electric dipole moments of light nuclei from chiral effective field theory

“…We expect that the results from a fully consistent calculation will not deviate significantly from the results we obtain here. The numbers below correspond to the Argonne v 18 potential [45], but results for the Reid93 and Nijmegen II potentials [44] agree within 5%. This is less than the error of order m π /M QCD ∼ 20% intrinsic to χPT in lowest order.…”

“…The deuteron EDM has been studied before in the meson-exchange picture [36,37,38,39,40], with various degrees of sophistication in the treatments of the P -and Tconserving interaction H P T . Using modern high-quality phenomenological potentials [44,45], Ref. [39] found that the model dependence of H P T is rather small for a deuteron EDM generated by the OPE sector of the / P/ T interaction.…”

“…In Ref. [42] both Argonne v18 [45] and EFTinspired [46] potentials, including the Coulomb interaction, were used. At large enough N max results become independent of Ω.…”

“…For the P T potential we use here realistic phenomenological potentials [44,45,46]. This "hybrid" approach [47] is justified whenever there is little sensitivity to the details of short-range physics, since such realistic potentials all include the long-range pion exchange that appears in chiral EFT at LO.…”

The EOS of Neutron Matter and the Effect of Λ Hyperons to Neutron Star Structure

“…The two body-potential that we use is the Argonne AV8' [10], that is a simplified form of the Argonne AV18 [11]. Although simpler to use in QMC calculations, the AV8' provides almost the same accuracy as AV18 in fitting NN scattering data.…”