Results 341 to 350 of about 8,367,557 (368)

Multicomponent Coupled Cluster Singles and Doubles Theory within the Nuclear-Electronic Orbital Framework.

Journal of Chemical Theory and Computation, 2018
The nuclear-electronic orbital (NEO) method treats all electrons and specified nuclei, typically protons, quantum mechanically on the same level with molecular orbital techniques. This approach directly includes nuclear delocalization, anharmonicity, and
Fabijan Pavošević, Tanner Culpitt, S. Hammes‐Schiffer   +2 more
semanticscholar   +1 more source

Multicomponent Density Functional Theory: Impact of Nuclear Quantum Effects on Proton Affinities and Geometries.

Journal of Physical Chemistry Letters, 2017
Nuclear quantum effects such as zero point energy play a critical role in computational chemistry and often are included as energetic corrections following geometry optimizations.
Kurt R. Brorsen, Yang Yang, S. Hammes‐Schiffer   +2 more
semanticscholar   +1 more source

Unified theory of nuclear reactions

Annals of Physics, 1958
A new formulation of the theory of nuclear reactions based on the properties of a generalized “optical” potential is presented. The real and imaginary part of this potential satisfy a dispersion type relation while its poles give rise to resonances in nuclear reactions.
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On the theory of nuclear matter

Astrophysics, 1987
The properties of degenerate stellar matter in the region of nuclear densities are considered. The threshold of the transition of the electron-nucleus phase to the state of continuous nuclear matter is found.
R. M. Avakyan, A. V. Sarkisyan
openaire   +2 more sources

Meson theory and nuclear matter

Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1955
An attempt is made to justify the use of the concept of a ‘mesic fluid’ in connexion with the structure of nuclear matter. A transformation is made of the usual symmetric pseudo-scalar meson theory to bring into evidence certain saturation properties, which provide a natural basis for the use of a 'self-consistent’ field in the discussion of nuclear ...
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Theory and computation of nuclear shielding

2020
The selected research papers on theoretical aspects of nuclear magnetic shielding published from 1 January to 31 December 2021 are shortly reviewed in this chapter. Among the reported studies are mainly density functional theory (DFT) predictions of nuclear shielding for free molecules, as well as in solution, modeled by the polarizable continuum model
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Effects of Diffusion on Free Precession in Nuclear Magnetic Resonance Experiments

, 1954
Nuclear resonance techniques involving free precession are examined, and, in particular, a convenient variation of Hahn's spin-echo method is described.
H. Carr, E. Purcell
semanticscholar   +1 more source

Theory of Nuclear Level Density

Physical Review, 1954
We have compared the level density of a nuclear model deduced from a statistical analysis with the results of the exact counting of the levels of the same model. The tables of levels of ${\mathrm{Ne}}^{20}$ given by Critchfield and Oleksa have been used as a test of the statistical theory. A new derivation of the level density is presented.
openaire   +3 more sources

The Reformed Nuclear Theory

2020
This chapter discusses the ‘reformed’ nuclear theory of trope bundles. The main difference of the reformed theory with the theory considered above is that the nucleus of a bundle is constituted by a unique nuclear trope. The reformed nuclear theory does not require a relation of ontological dependence with especial, non-standard characteristics.
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Introductory Nuclear Theory

Physics Bulletin, 1959
By L. R. B. Elton London : Sir Isaac Pitman & Sons Ltd. Pp. xi + 286. Price 40s. Dr. Elton's book should prove to be a most useful theoretical introduction to students beginning nuclear physics. It covers a wide range of topics, following the general pattern of Blatt and Weisskopf's Theoretical Nuclear Physics, with the addition of a final chapter ...
openaire   +2 more sources