Dipole polarizability, sum rules, mean excitation energies, and long-range dispersion coefficients for buckminsterfullerene C60

2011 ◽  
Vol 516 (4-6) ◽  
pp. 208-211 ◽  
Author(s):  
Ashok Kumar ◽  
Ajit J. Thakkar
Keyword(s):  
Long Range ◽  
Sum Rules ◽  
Dipole Polarizability ◽  
Excitation Energies ◽  
Dispersion Coefficients ◽  
Buckminsterfullerene C60

Long-Range Particle Emission in Coincidence with Fission at Moderate Excitation Energies

1964 ◽  
Vol 133 (3B) ◽  
pp. B724-B731 ◽  
Author(s):  
J. A. Coleman ◽  
A. W. Fairhall ◽  
I. Halpern
Keyword(s):  
Long Range ◽  
Particle Emission ◽  
Excitation Energies

Sum rules and mean excitation energies for longitudinal isoscalar electroexcitation of nuclei

1977 ◽  
Vol 16 (2) ◽  
pp. 812-815 ◽  
Author(s):  
E. Lipparini ◽  
G. Orlandini ◽  
R. Leonardi
Keyword(s):  
Sum Rules ◽  
Excitation Energies

scholarly journals How do we infer shell effects at high-excitation energies? A new spectroscopic probe to search for magic numbers

2019 ◽  
Vol 223 ◽  
pp. 01045 ◽  
Author(s):  
Cebo Ngwetsheni ◽  
José Nicolás Orce
Keyword(s):  
Gamma Ray ◽  
Strength Function ◽  
Dipole Polarizability ◽  
Magic Numbers ◽  
Data Sets ◽  
High Excitation ◽  
Excitation Energies ◽  
Long Range Correlations ◽  
Shell Effects ◽  
Spectroscopic Probe

The nuclear dipole polarizability is mainly governed by the dynamics of the giant dipole resonance and, assuming validity of the brink-Axel hypothesis, has been investigated along with the effects of the low-energy enhancement of the photon strength function for nuclides in medium- and heavy-mass nuclei. Cubic-polynomial fitsto both data sets extrapolated down to a gamma-ray energy of 0.1 MeV show a significantreduction of the nuclear dipole polarizability for semi-magic nuclei, with magic numbers N =28, 50 and 82, which supports shell effects at high-excitation energies in the the quasi-continuum region. This work assigns σ-2 values as sensitive measures of long-range correlations of the nuclear force and provides a new spectroscopic probe to search for “old” and “new” magic numbers at high-excitation energies.

scholarly journals Long-Range Corrected DFT Calculations of First Hyperpolarizabilities and Excitation Energies of Metal Alkynyl Complexes

ChemPhysChem ◽  
2018 ◽  
Vol 19 (12) ◽  
pp. 1537-1546 ◽  
Author(s):  
Mahesh S. Kodikara ◽  
Rob Stranger ◽  
Mark G. Humphrey
Keyword(s):  
Dft Calculations ◽  
Long Range ◽  
Excitation Energies

Polarizability effects in atomic nuclei

2020 ◽  
Vol 29 (03) ◽  
pp. 2030002
Author(s):  
J. N. Orce
Keyword(s):  
Symmetry Energy ◽  
Neutron Cross Section ◽  
Light Nuclei ◽  
Dipole Polarizability ◽  
Nuclear Symmetry Energy ◽  
Excitation Energies ◽  
Long Range Correlations ◽  
Shell Effects ◽  
Section Data ◽  
Strength Functions

This work sheds light upon how the atomic nucleus polarizes throughout the nuclear chart. Deviations from the well-known behavior of the nuclear dipole polarizability — which smoothly increases with increasing atomic mass number — are investigated. Relative enhancements are found for light nuclei as the nuclear symmetry energy decreases and, within a nucleus, as its excitation energy increases. These two properties are related by a diminishing binding energy of the nuclear system. Contrarily, hindrances of nuclear polarizability are observed in the photo-neutron cross-section data and photon-strength functions of semi-magic nuclei with [Formula: see text], 50 and 82, which support the presence of shell effects at low-lying excitations and — assuming validity of the Brink-Axel hypothesis — at high-excitation energies up to the quasi-continuum region. These features assign the nuclear dipole polarizability as a sensitive measure of the long-range correlations of the nuclear force, and provide a new spectroscopic probe to investigate collective phenomena, shell closures, and the elusive nuclear symmetry energy. Particular cases of quadrupole collectivity are also discussed in terms of the available, and yet so scarce, information on nuclear polarizability (e.g. Sn and Ni isotopes).

scholarly journals Long-range dispersion coefficients for Li, Li+, and Be+ interacting with the rare gases

2010 ◽  
Vol 133 (10) ◽  
pp. 104306 ◽  
Author(s):  
Li-Yan Tang ◽  
Jun-Yi Zhang ◽  
Zong-Chao Yan ◽  
Ting-Yun Shi ◽  
J. Mitroy
Keyword(s):  
Long Range ◽  
Rare Gases ◽  
Dispersion Coefficients
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