Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ab Initio study of neutron drops with chiral Hamiltonians   We report ab initio calculations for neutron drops in a 10 MeV external
harmonic-oscillator trap using chiral nucleon-nucleon plus three-nucleon
interactions. We present total binding energies, internal energies, radii and
odd-even energy differences for neutron numbers N = 2 - 18 using the no-core
shell model with and without importance truncation. Furthermore, we present
total binding energies for N = 8, 16, 20, 28, 40, 50 obtained in a
coupled-cluster approach. Comparisons with Green's Function Monte Carlo
results, where available, using Argonne v8' with three-nucleon interactions
reveal important dependences on the chosen Hamiltonian.

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The categories of this paper are: chao-dyn
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The categories of this paper are: gr-qc
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The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
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The categories of this paper are: supr-con
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The categories of this paper are: q-fin
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-th
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The categories of this paper are: hep-lat
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The categories of this paper are: atom-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: chem-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: cs
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The categories of this paper are: hep-ex
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The categories of this paper are: math