Nuclear Science References (NSR)

NUCLEAR REACTIONS ¹⁶O(p, p), E=65, 100, 135, 180 MeV; ¹²C(p, p), E=65, 100, 122, 160 MeV; ¹²C(n, n), E=65, 95, 155, 185 MeV; calculated σ(E), σ(θ, E), expansion parameter, analyzing power, spin rotation function, Wolfenstein amplitudes. Quantified the truncation uncertainty arising from each order in the chiral EFT. Calculations in frameworks of the spectator expansion of multiple scattering theory as well as the nocore shell model with chiral interaction from the LENPIC collaboration up to the third chiral order. Comparison to available experimental data.

doi: 10.1103/PhysRevC.106.064605
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2021BA24 Phys.Rev. C 103, 054314 (2021)

R.B.Baker, M.Burrows, Ch.Elster, K.D.Launey, P.Maris, G.Popa, S.P.Weppner

Nuclear spin features relevant to ab initio nucleon-nucleus elastic scattering

NUCLEAR STRUCTURE ^4,6,8He; calculated neutron and proton spin-projected, one-body momentum distributions using NNLO_opt chiral interaction, magnetic moments of the 2+ excited states in the ground state rotational bands; deduced spin content of a J=0 wave function, connection between reaction observables such as analyzing powers and structure observables such as magnetic moments in the framework of the spectator expansion with no-core shell model. Relevance to effective interactions for elastic nucleon-nucleus scattering.

doi: 10.1103/PhysRevC.103.054314
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2021SA18 Phys.Rev. C 103, 044305 (2021)

G.H.Sargsyan, K.D.Launey, R.B.Baker, T.Dytrych, J.P.Draayer

SU(3)-guided realistic nucleon-nucleon interactions for large-scale calculations

NUCLEAR STRUCTURE ¹²C; calculated excitation energies of the first 2+ and 4+ states, rms radius of the ground state, B(E2) for the first 2+ state, probability amplitudes for configurations that make up the ground state, energies of the proton-neutron system for the positive-parity lowest-lying states up to 5+. SU(3)-coupled or Sp(3, R)-coupled ab initio symmetry-adapted no-core shell model (SA-NCSM) calculation with realistic NN interactions. Comparison with experimental values.

doi: 10.1103/PhysRevC.103.044305
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2020BA35 Phys.Rev. C 102, 014320 (2020)

R.B.Baker, K.D.Launey, S.Bacca, N.N.Dinur, T.Dytrych

Benchmark calculations of electromagnetic sum rules with a symmetry-adapted basis and hyperspherical harmonics

NUCLEAR STRUCTURE ⁴He; calculated ground state energy, point-proton rms radius, nonenergy and energy weighted sum rules for monopole and dipole transitions, electric dipole polarizability, quadrupole sum rule. Calculations used ab initio symmetry-adapted no-core shell model (SA-NCSM) with the Lanczos algorithm, and JISP16 and N3LO-EM nucleon-nucleon interactions. Comparison with other model predictions.

doi: 10.1103/PhysRevC.102.014320
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2020BU11 Phys.Rev. C 102, 034606 (2020)

M.Burrows, R.B.Baker, Ch.Elster, S.P.Weppner, K.D.Launey, P.Maris, G.Popa

Ab initio leading order effective potentials for elastic nucleon-nucleus scattering

NUCLEAR REACTIONS ¹H(n, n), (p, p), E=100, 200 MeV; calculated Wolfenstein amplitudes as function of the scatting angle and momentum transfer for NNLO_opt chiral interaction, and CD-Bonn potential. ^4,6,8He, ¹²C, ¹⁶O(p, p), (polarized p, p), E=65, 71, 100, 122, 200 MeV; calculated differential σ(θ, E), analyzing powers A_y(θ, E) with NNLO_opt chiral interaction; deduced leading order ab initio effective potential for nucleon-nucleus elastic scattering using the spectator expansion of multiple scattering theory. ¹²C, ¹⁶O(n, n), E=60-210 MeV; calculated σ(E). Comparison with experimental data.

doi: 10.1103/PhysRevC.102.034606
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2020DR03 Phys.Rev. C 102, 044608 (2020)

A.C.Dreyfuss, K.D.Launey, J.E.Escher, G.H.Sargsyan, R.B.Baker, T.Dytrych, J.P.Draayer

Clustering and α-capture reaction rate from ab initio symmetry-adapted descriptions of ²⁰Ne

NUCLEAR REACTIONS ¹⁶O(α, γ)²⁰Ne, E(cm)=1.33 MeV; calculated bound state wave functions and spectroscopic amplitudes for resonances, α partial widths, asymptotic normalization coefficient (ANC) for ²⁰Ne g.s., astrophysical reaction rates at temperatures of 1-10 GK. Calculations of overlap between the ¹⁶O+α cluster configuration and states in ²⁰Ne using the ab initio symmetry-adapted no-core shell model (SA-NCSM). Comparison with experimental data.

doi: 10.1103/PhysRevC.102.044608
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2020DY01 Phys.Rev.Lett. 124, 042501 (2020)

T.Dytrych, K.D.Launey, J.P.Draayer, D.J.Rowe, J.L.Wood, G.Rosensteel, C.Bahri, D.Langr, R.B.Baker

Physics of Nuclei: Key Role of an Emergent Symmetry

NUCLEAR STRUCTURE ⁶Li, ⁸He, ²⁰Ne; calculated excitation energies of the ground-state rotational band using first-principles of nuclear structure that the special nature of the strong nuclear force determines highly regular patterns unrecognized in nuclei that can be tied to an emergent approximate sy mmetry.

doi: 10.1103/PhysRevLett.124.042501
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2020LA13 Eur.Phys.J. Special Topics 229, 2429 (2020)

K.D.Launey, T.Dytrych, G.H.Sargsyan, R.B.Baker, J.P.Draayer

Emergent symplectic symmetry in atomic nuclei; Ab initio symmetry-adapted no-core shell model

NUCLEAR STRUCTURE ²⁰Ne, ¹²C; calculated B(E2), deformation parameters, level energies. Comparison with available data.

doi: 10.1140/epjst/e2020-000178-3
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2017DR03 Phys.Rev. C 95, 044312 (2017)

A.C.Dreyfuss, K.D.Launey, T.Dytrych, J.P.Draayer, R.B.Baker, C.M.Deibel, C.Bahri

Understanding emergent collectivity and clustering in nuclei from a symmetry-based no-core shell-model perspective

NUCLEAR STRUCTURE ¹²C; calculated levels, J, π, basis states, probability distribution for excitations of lowest 0+ and 4+ states, B(E2), M(E0), Hoyle state. ¹²C, ^16,20O, ^20,22Mg, ^20,22Ne; calculated energies and B(E2) of first excited 0+ state, EGMR, and the lowest excited 2+ state. Symmetry-based no-core symplectic shell model (NCSpM) calculations for ground-state rotational band, the Hoyle state, and its 2+ and 4+ excitations, and the giant monopole 0+ resonance. Comparison with experimental data.

doi: 10.1103/PhysRevC.95.044312
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