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We calculate properties of neutron drops in external potentials using bothquantum Monte Carlo and no-core full configuration techniques. The propertiesof the external wells are varied to examine different density profiles. Wecompare neutron drop results given by a selection of nuclear Hamiltonians,including realistic two-body interactions as well as several three-body forces.We compute a range of properties for the neutron drops: ground-state energies,spin-orbit splittings, excitation energies, radial densities and rms radii. Wecompare the equations of state for neutron matter for several of theseHamiltonians. Our results can be used as benchmarks to test other many-bodytechniques, and to constrain properties of energy-density functionals.

Properties of trapped neutrons interacting with realistic nuclear Hamiltonians