Ab initio many-body calculations of nucleon scattering on 4He, 7Li, 7Be, 12C and 16O

Abstract

We combine a recently developed ab initio many-body approach capable of describing simultaneously both bound and scattering states, the ab initio NCSM/RGM, with an importance truncation scheme for the cluster eigenstate basis and demostrate its applicability to nuclei with mass numbers as high as 17. Using soft similarity renormalization group evolved chiral nucleon-nucleon interactions, we first calculate nucleon-4He phase shifts, cross sections and analyzing power. Next, we investigate nucleon scattering on 7Li, 7Be, 12C and 16O in coupled-channel NCSM/RGM calculations that include low-lying excited states of these nuclei. We check the convergence of phase shifts with the basis size and study A=8, 13, and 17 bound and unbound states. Our calculations predict low-lying resonances in 8Li and 8B that have not been experimentally clearly identified yet. We are able to reproduce reasonably well the structure of the A=13 low lying states. However, we find that A=17 states cannot be described without an improved treatment of 16O one-particle-one-hole excitations and alpha clustering.

18 pages, 20 figures

References in corpus (15)

• Similarity Renormalization Group for Nucleon-Nucleon Interactions
• Recent developments in no-core shell-model calculations
• A high-precision variational approach to three- and four-nucleon bound and zero-energy scattering states
• Ab Initio Many-Body Calculations of n-3H, n-4He, p-{3,4}He, and n-10Be Scattering
• Evolution of Nuclear Many-Body Forces with the Similarity Renormalization Group
• Quantum Monte Carlo calculations of neutron-alpha scattering
• Importance Truncation for Large-Scale Configuration Interaction Approaches
• Nuclear Structure in the Framework of the Unitary Correlation Operator Method
• Four-nucleon scattering: Ab initio calculations in momentum space
• Four-body calculation of proton-3He scattering
• Complex coupled-cluster approach to an ab-initio description of open quantum systems
• Unitary Correlation Operator Method and Similarity Renormalization Group: Connections and Differences
• Ab initio computation of the 17F proton-halo state and resonances in A = 17 nuclei
• Low-lying states in 8B
• Ab initio coupled-cluster and configuration interaction calculations for 16-O using V_UCOM

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