[Portrait]

Kai Neergård

Nuclear theorist

Licentiatus scientiarum (PhD), University of Copenhagen 1975. Advisor: Aage Bohr

Publications

Kai Neergård, "Identifying the simple finite-dimensional Lie algebras over C by means of simple sequences, arXiv:2510.19703 (2025)
K. Neergård, "Onishi" formulas, Nucl. Theor. 40, 13 (2023) (presented at the 40th Anniversary International Workshop on Nuclear Theory, 2-8 July 2023, Rila Mountains, Bulgaria)
K. Neergård, Proof of the Orthogonal-Pin Duality, Bulg. J. Phys. 50, 146 (2023)
K. Neergård, Fock space representations of Bogolyubov transformations as spin representations, Phys. Rev. C 107, 0243158 (2023)
K. Neergård, 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, Phys. Rev. C 106, 024308 (2022)
K. Neergård, Fock space dualities, Bulg. J. Phys. 48, 390 (2021) (presented at The International Workshop "Shapes and Dynamics of Atomic Nuclei: Contemporary Aspects", 16-18 September 2021 (SDANCA-21), Sofia, Bulgaria)
K. Neergård, Fock space dualities, J. Math. Phys. 61, 081702 (2020)
K. Neergård, I. Bentley, Role of pair-vibrational correlations in forming the odd-even mass difference, Nuovo Cimento C 42, 102 (2019) (presented at the 2018 European Nuclear Physics Conference, 2-7 September 2018, Bologna, Italy)
K. Neergård, Proof by characters of the orthogonal-orthogonal duality and relations of Casimir invariants, J. Math. Phys. 60, 081705 (2019)
K. Neergård, I. Bentley, Role of pair-vibrational correlations in forming the odd-even mass difference, Phys. Rev. C 99, 054315 (2019)
K. Neergård, Pairing Theory of the Wigner Cusp, Nucl. Theor. 36, 195 (2017) (presented at 36th International Workshop on Nuclear Theory, 25 June-1 July 2017, Rila Mountains, Bulgaria)
A. Kingan, K. Neergård, L. Zamick, Symmetry energies for A=24 and 48 and the USD and KB3 shell model Hamiltonians, Phys. Rev. C 96, 064302 (2017)
W. Pereira, R. Garcia, L. Zamick, A. Escuderos, K. Neergård, Partial conservation law in a schematic single j shell model, Int. J. Mod. Phys. E 26, 1740021 (2017)
K. Neergård, Closed expression for the pair vibrational correlation energy of a uniform distribution of single-nucleon levels, Phys. Rev. C 94, 054328 (2016)
K. Neergård, Nambu-Goldstone modes in the random phase approximation, Prog. Theor. Exp. Phys. 2016 (10):103A01 (2016)
I. Bentley, K. Neergård, S. Frauendorf, Comment on "No-core configuration-interaction model for the isospin- and angular-momentum-projected states" by Satuła, Bączyk, Dobaczewski, and Konieczka, arXiv:1608.08615 (2016)
K. Neergård, Conservation laws in the 1f_7/2 shell model of ⁴⁸Cr, Phys. Rev. C 91, 044313 (2015)
K. Neergård, Symplectic group structure of the ⁴⁸Cr, ⁸⁸Ru, and ⁹²Pd ground states, Phys. Rev. C 90, 014318 (2014)
I. Bentley, K. Neergård, S. Frauendorf, Nuclear masses near N=Z from Nilsson-Strutinsky calculations with pairing corrections beyond BCS from an isospin-conserving pairing force, Phys. Rev. C 89, 034302 (2014)
K. Neergård, Cooperation of anti-aligning and aligning shell-model forces for N=Z, Phys. Rev. C 88, 034329 (2013)
K. Neergård, Pairing theory of the symmetry energy, Phys. Rev. C 80, 044313 (2009)
S. Frauendorf, K. Neergård, Comment on "Interaction induced deformation of the momentum distribution of spin polarized nuclear matter", Phys. Rev. C 69, 049801 (2004)
K. Neergård, On the linear term in the nuclear symmetry energy, Phys. Lett. B 572, 159 (2003)
K. Neergård, Interpretation of the Wigner energy as due to RPA correlations, Phys. Lett. B 537, 287 (2002)
S. Frauendorf, K. Neergård, J. A. Sheikh, P. M. Walker, Moments of inertia for multiquasiparticle configurations, Phys. Rev. C 61, 064324 (2000)
S. Frauendorf, K. Neergård, Rotating nuclear matter, Z. Phys. A 354, 381 (1996)
M. A. Deleplanque, J. C. Bacelar, E. M.Beck, R. M. Diamond, F. S. Stephens, J. E. Draper, T. Døssing, K. Neergård, Particle-hole states at high spin in ¹⁵⁰Dy, Phys. Lett. B 195, 17 (1987)
S. Åberg, T. Døssing, K. Neergård, Theoretical calculations of γ-ray feeding patterns for Gd, Dy and Er nuclei, Nucl. Phys. A 443, 91 (1985)
K. Mühlhans, K. Neergård, U. Mosel, Solution of the Hartree-Fock-Bogoliubov problem in the canonical representation, Nucl. Phys. A 420, 204 (1984)
K. Neergård, E. Wüst, On the calculation of matrix elements of operators between symmetry-projected Bogoliubov states, Nucl. Phys. A 402, 311 (1983)
K. Mühlhans, U. Mosel, K. Neergård, M. Diebel, E. M. Müller, A. L. Goodman, Multipole Pair Fields at High Temperature and Spin, in Proceedings of the XXIth International Winter Meeting on Nuclear Physics, Bormio, Italy (1983)
E. M. Müller, K. Neergård, On the interpretation of rotational bands in odd actinide nuclei, Phys. Lett. B 120, 280 (1983)
K. Mühlhans, M. Diebel, K. Neergård, U. Mosel, Influence of shell structure on multipole pairing, Phys. Lett. B 120, 44 (1983)
K. Neergård, "Non-Rotating" Yrast States, Phys. Scripta T5, 51 (1983)
K. Neergård, The deformed independent particle model of yrast spectra, Proceedings of the Nuclear Physics Workshop, International Centre for Theoretical Physics, Trieste, Italy 1981, ed. C. Dasso, R. A. Broglia, A. Winter (North-Holland Publishing Company, Amsterdam, Netherlands 1982), p. 205
E. M. Müller, K. Mühlhans, K .Neergård, U. Mosel, Generalized pair field in fast rotating nuclei, Nucl. Phys. A 383, 233 (1982)
K. Neergård, The isovector dipole mode in heated rotating nuclei, Phys. Lett. B 110, 7 (1982)
C. G. Andersson, R. Bengtsson, T. Bengtsson, J. Krumlinde, G. Leander, K. Neergård, P. Olanders, J. A. Pinston, I. Ragnarsson, Z. Szymanski, Survey of Collective and Single-Particle Features in the Yrast Domain of the A∼150 Nuclei, Phys. Scripta 24, 266 (1981)
T. Døssing, K. Neergård, H. Sagawa, Yrast Spectra in the ¹⁴⁶Gd Region, Phys. Scripta 24, 258 (1981)
K. Mühlhans, E. M. Müller, K. Neergård, U. Mosel, The pair field of rotating ²⁴Mg, Phys. Lett. B 105, 329 (1981)
K. Neergård, T. Døssing, H. Sagawa, Electromagnetic moments of isomers in ^{144,146,147,148}Gd in the deformed independent particle model, Phys. Lett. B 99, 191 (1981)
T. Døssing, K. Neergård, H. Sagawa, On the structure and deformation of yrast states in ¹⁴⁶Gd, ¹⁴⁷Gd, and ¹⁵²Dy, J. Phys. Colloques 41, C10-79 (1980)
K. Neergård, A possible connection between the attenuations of the Coriolis interaction and the recoil term, Phys. Lett. B 89, 5 (1979)
T. Døssing, K. Neergård, K. Matsuyanagi, Yrast spectra of ¹⁴⁶Gd, ¹⁴⁷Gd and ¹⁵²Dy in the deformed independent particle model, Proceedings of the Symposium High-Spin Phenomena in Nuclei, Argonne, USA 1979, ANL/PHY-79-4, p. 565 (1979)
K. Neergård, P. Vogel, Particle-plus rotor model description of two-quasiparticle bands in ¹⁶⁴Er, Proceedings of the Symposium High-Spin Phenomena in Nuclei, Argonne, USA 1979, ANL/PHY-79-4, p. 559 (1979)
G. Leander, C. G. Andersson, S. G. Nilsson, I. Ragnarsson, S. Åberg, J. Almberger, T. Døssing, K. Neergård, Properties of yrast states and yrast traps, Proceedings of the Symposium High-Spin Phenomena in Nuclei, Argonne, USA 1979, ANL/PHY-79-4, p. 197 (1979)
K. Matsuyanagi, T. Døssing, K. Neergård, High-spin isomers in Po, At and Rn in the deformed independent particle model, Nucl. Phys. A 307, 253 (1978)
И. Н. Михайлов, К. Неергор, В. В. Пашкевич, С. Фрауендорф, Влияние вращения на коллективные свойства атомных ядер, Физ. Эл. Частиц Ат. Ядра 8, 1338 (1977) [I. N. Mikhajlov, K. Neergård, V. V. Pashkevich, S. Frauendorf, Influence of rotation on the collective properties of nuclei, Sov. J. Part. Nucl. 8, 550 (1977)]
T. Døssing, K. Neergård, K. Matsuyanagi, X. Chang, Structure of Yrast Traps, Phys. Rev. Lett. 39, 1395 (1977)
K. Neergård, H. Toki, M. Ploszajczak, A. Faessler, Very high spin Strutinsky calculations with a woods-saxon potential, Nucl. Phys. A 287, 48 (1977)
H. Toki, K. Neergård, P. Vogel, A. Faessler, Non-axial deformations and the odd parity states in the even Pt and Hg isotopes, Nucl. Phys. A 279, 1 (1977)
K. Neergård, V. V. Pashkevich, S. Frauendorf, Shell energies of rapidly rotating nuclei, Nucl. Phys. A 262, 61 (1976)
K. Neergård, V. V. Pashkevich, Shell corrections to the deformation energies of very high spin nuclei (I≲100), Phys. Lett. B 59, 218 (1975)
K. Neergård, P. Vogel, M. Radomski, Semi-decoupled bands in the even Hg isotopes, Nucl. Phys. A 238, 199 (1975)
S. Landowne, R. A. Broglia, K. Neergård, How indirect (p,t) processes populate the γ-band of ¹⁶⁸Yb, Phys. Lett. B 44, 425 (1973)
K. Neergård, P. Vogel, On the microscopic description of nuclear vibrations when phonons occur at relatively low energy: (II). Octupole states of the even deformed nuclei with A≧222, Nucl. Phys. A 149, 217 (1970)
K. Neergård, P. Vogel, On the microscopic description of nuclear vibrations when phonons occur at relatively low energy: (I). Theory, Nucl. Phys. A 149, 209 (1970)
K. Neergård, P. Vogel, Low-lying octupole states of the doubly even deformed nuclei with 152≦A≦190, Nucl. Phys. A 145, 33 (1970)
K. Neergård, P. Vogel, Coriolis interaction between octupole states in the even Dy isotopes, Phys. Lett. B 30, 75 (1969)

Unpublished