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NSR database version of May 8, 2024.

Search: Author = N.M.Parzuchowski

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2017PA09      Phys.Rev. C 95, 044304 (2017)

N.M.Parzuchowski, T.D.Morris, S.K.Bogner

Ab initio excited states from the in-medium similarity renormalization group

NUCLEAR STRUCTURE ^16,22O; calculated low-lying levels using ab initio approach within the in-medium similarity renormalization group (IMSRG) framework, and Tamm-Dancoff approximation (TDA) with equations-of-motion (EOM) techniques.

doi: 10.1103/PhysRevC.95.044304
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2017PA26      Phys.Rev. C 96, 034324 (2017)

N.M.Parzuchowski, S.R.Stroberg, P.Navratil, H.Hergert, S.K.Bogner

Ab initio electromagnetic observables with the in-medium similarity renormalization group

NUCLEAR STRUCTURE ¹⁴C; calculated energies of the ground state and first 2+ state, B(E2) for the first 2+ state. ²H; calculated energy, magnetic dipole moment, electric quadrupole moment and charge radius of the ground state. ⁶Li; calculated energies of ground-state and first 3+ state, quadrupole moments, B(M1), B(E2). ⁶He, ¹⁴C, ²²O, ³²S, ⁴⁸Ca, ^56,60Ni; calculated energies and B(E2) of first 2+ states. ¹⁴N; calculated energy and B(M1) of the first excited 0+ state. ³²S, ³²Cl; calculated energies, B(M1) and magnetic-dipole moments of first 1+ states. ¹⁶O, ⁴⁰Ca; calculated energies and B(E3) of first 3- states. ¹⁴C, ²²O, ³²S; calculated E2 and M1 transition matrix elements. Equations-of-motion in-medium similarity renormalization group (EOM-IMSRG), and valence-space VS-IMSRG methods. Comparison with available experimental values, and theoretical calculations from no-core shell-model.

doi: 10.1103/PhysRevC.96.034324
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2015MO19      Phys.Rev. C 92, 034331 (2015)

T.D.Morris, N.M.Parzuchowski, S.K.Bogner

Magnus expansion and in-medium similarity renormalization group

NUCLEAR STRUCTURE ¹⁶O; calculated energy of the ground-state of ¹⁶O and that of homogeneous electron gas (HEG) using an improved variant of the in-medium similarity renormalization group (IM-SRG) based on the Magnus expansion and a first-order Euler method. Substantial memory savings and modest computational speedups.

doi: 10.1103/PhysRevC.92.034331
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