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NSR database version of April 27, 2024.

Search: Author = K.Neergaard

Found 9 matches.

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2023NE02      Phys.Rev. C 107, 024315 (2023)

K.Neergaard

Fock space representations of Bogolyubov transformations as spin representations

doi: 10.1103/PhysRevC.107.024315
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2022NE09      Phys.Rev. C 106, 024308 (2022)

K.Neergaard

Relation to a property of the angular-momentum-zero space of states of four fermions in an angular momentum j=9/2 shell unexpectedly found to be stationary for any rotationally invariant two-body interaction

NUCLEAR STRUCTURE ⁹⁴Ru, ⁹⁶Pd, ⁷⁴Ni; calculated multiplicities of multiplets of four angular momentum j=9/2 fermions per angular momentum J and seniority ν, structure of multifermion states in the j=9/2 shell, actions of five basic rotationally invariant two-body interactions on four basic states expressed in matrix format; deduced equivalence of existence of the Escuderos-Zamick states to a property of the space of J=0 states of the system, with application to states in ⁹⁴Ru, ⁹⁶Pd, ⁷⁴Ni.

doi: 10.1103/PhysRevC.106.024308
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2019NE04      Phys.Rev. C 99, 054315 (2019); Erratum Phys.Rev. C 100, 019902 (2019)

K.Neergaard, I.Bentley

Role of pair-vibrational correlations in forming the odd-even mass difference

ATOMIC MASSES A=25-99, N=13-50; Z=49-51, N=46-92; Z=38-42, N=60-64; calculated odd-even mass differences for odd-A nuclei using random-phase-approximation-amended (RPA-amended) Nilsson-Strutinsky scheme, including pair-vibrational correlation energy.

doi: 10.1103/PhysRevC.99.054315
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2017KI13      Phys.Rev. C 96, 064302 (2017)

A.Kingan, K.Neergaard, L.Zamick

Symmetry energies for A=24 and 48 and the USD and KB3 shell model Hamiltonians

NUCLEAR STRUCTURE ²⁴Mg, ²⁴Ne, ²⁴O, ⁴⁸Cr, ⁴⁸Ti, ⁴⁸Ca; calculated ground-state energies from the sd shell USD (A=24) and the pf shell KB3 (A=48) Hamiltonians with components of the two-nucleon interactions successively turned off.

doi: 10.1103/PhysRevC.96.064302
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2016NE11      Phys.Rev. C 94, 054328 (2016)

K.Neergaard

Closed expression for the pair vibrational correlation energy of a uniform distribution of single-nucleon levels

NUCLEAR STRUCTURE A=20-100; calculated residual neutron-proton pair vibrational correlation energy as function of isospin T/mass number A, RPA energies of doubly even nuclei as functions of mass number, with pair vibrational correlation energy generated in the random-phase approximation (RPA) by the isovector pairing force.

doi: 10.1103/PhysRevC.94.054328
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2015NE06      Phys.Rev. C 91, 044313 (2015); Erratum Phys.Rev. C 99, 049901 (2019)

K.Neergaard

Conservation laws in the 1f_7/2 shell model of ⁴⁸Cr

NUCLEAR STRUCTURE ⁴⁸Ca; proved and explained certain conservation laws in the single-j-shell model by considering symmetry under particle-hole conjugation and the structure of the irrepresentations of the symplectic group Sp(4). Discussed generalization.

doi: 10.1103/PhysRevC.91.044313
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2014BE06      Phys.Rev. C 89, 034302 (2014)

I.Bentley, K.Neergaard, S.Frauendorf

Nuclear masses near N=Z from Nilsson-Strutinsky calculations with pairing corrections beyond BCS from an isospin-conserving pairing force

NUCLEAR STRUCTURE A=24-100; calculated binding energy difference for T=0 even-even and odd-odd nuclei near N=Z, energy difference of first T=1 and T=0 states in odd-odd N=Z nuclei, reciprocal isorotational moment of inertia, Wigner energy. Charge-independent potential well interacting by an isovector pairing force beyond BCS formalism. Hartree-Bogolyubov (HB) with random phase approximation (RPA) for a 24-dimensional valence space within in the general framework of Nilsson-Strutinsky calculation. Comparison with experimental data.

doi: 10.1103/PhysRevC.89.034302
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2014NE07      Phys.Rev. C 90, 014318 (2014)

K.Neergaard

Symplectic group structure of the ⁴⁸Cr, ⁸⁸Ru, and ⁹²Pd ground states

NUCLEAR STRUCTURE ⁴⁸Cr, ⁸⁸Ru, ⁹²Pd; calculated ground state configurations using 1f_7/2 or 1g_9/2 shell model analyzed in terms of symplectic group irreps. Comparison with stretch scheme model of Danos and Gillet.

doi: 10.1103/PhysRevC.90.014318
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2013NE18      Phys.Rev. C 88, 049901 (2013)

K.Neergaard

Erratum: Pairing theory of the symmetry energy [Phys. Rev. C 80, 044313 (2009)]

doi: 10.1103/PhysRevC.88.049901
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