A BCS-Like Approach to the Excited State in 11Li

1997 ◽  
Vol 12 (37) ◽  
pp. 2883-2888 ◽  
Author(s):  
M. Kyotoku ◽  
C. L. Lima ◽  
E. Baldini Neto ◽  
N. Teruya
Keyword(s):  
Excited State ◽  
Model Calculation ◽  
Excited States ◽  
Experimental Results ◽  
Halo Nuclei ◽  
First Excited State ◽  
Level Model ◽  
Good Agreement ◽  
Two Level Model

A modified BCS approach is used to interpret the first excited state of 11 Li halo nuclei. In this scheme, a simple two-level model calculation is performed leading to results in good agreement with the experimental results for 11 Li for both ground and first excited states. A comparison with exact and QRPA calculations is also presented.

scholarly journals GDR Contribution to Coulomb Excitation. II. 17O

1982 ◽  
Vol 35 (3) ◽  
pp. 301 ◽  
Author(s):  
FC Barker
Keyword(s):  
Excited State ◽  
Shell Model ◽  
Excited States ◽  
Giant Dipole Resonance ◽  
Coulomb Excitation ◽  
Dipole Resonance ◽  
First Excited State ◽  
Virtual Excitation

The contribution to the Coulomb excitation of the first excited state of 170 due to virtual excitation of the giant dipole resonance (GDR) is calculated, using shell model wavefunctions for the ground and first excited states. A large value is obtained.

RELATION BETWEEN QUANTUM AND GEOMETRIC DIMENSIONALITIES IN MOLECULAR NONLINEAR OPTICS: BEYOND THE TWO-LEVEL MODEL FOR ANISOTROPIC SYSTEMS

1996 ◽  
Vol 05 (04) ◽  
pp. 671-693 ◽  
Author(s):  
S. BRASSELET ◽  
J. ZYSS
Keyword(s):  
Excited States ◽  
Second Harmonic ◽  
Three Dimensional ◽  
Wavelength Dependence ◽  
Quantum Model ◽  
Substitution Pattern ◽  
Molecular Systems ◽  
Level Model ◽  
Anisotropic Systems ◽  
Two Level Model

The nonlinear optical susceptibilities of two- or three-dimensional molecular systems exhibit variable anisotropic features depending on their structure and substitution pattern. We show that appropriate geometric (e.g. tensorial) considerations combined with an n-level quantum model (n≥3) are able to account for such nonlinear anisotropy as rigorously defined in an invariant spherical formalism by extension of classical linear anisotropy. We call on two kinds of experiments to investigate these properties: firstly, variation of the incident polarization (VIP) in harmonic light scattering (HLS) experiments is being performed to sort out individual tensorial components of the quadratic hyperpolarizability β tensor; secondly, wavelength dependence studies in coherent second harmonic generation (SHG) from poled thin film media are shown at a preliminary stage to be able to designate those excited states responsible for the nonlinear anisotropy.

Nuclear alinement of manganese-56

1959 ◽  
Vol 250 (1263) ◽  
pp. 550-561 ◽  
Keyword(s):  
Angular Distribution ◽  
Excited State ◽  
Angular Correlation ◽  
Excited States ◽  
Daughter Nucleus ◽  
Γ Radiation ◽  
Mixing Ratios ◽  
First Excited State ◽  
Γ Rays ◽  
Coincidence Measurements

The present work demonstrates the feasibility of alining manganese-56 produced by neutron irradiation of a nickel fluosilicate crystal containing stable 55 Mn. Measurements were made of the angular distribution of the γ-radiation from the alined 56 Mn and also of the angular correlation of the γ-rays from this isotope. By combining the results it is possible to establish uniquely as 2 the spins of the states of the daughter nucleus of 56 Fe at 2.66 and 2.98 MeV. The mixing ratios δ ( E 2/ M 1) for the 1.81 and 2.13 MeV γ-rays to the first excited state are shown to be 0.19 ± 0.02 and — 0.28 ± 0.02. The spectrum of the γ-radiation was studied with a scintillation spectrometer and this leads to the following relative intensities; 0.845 MeV (100%), 1.81 MeV (27 ± 3%), 2.13 MeV (15 ± 3%), 2.55 MeV (1.2 ± 0.2%), 2.66 MeV (0.65 ± 0.1%), 2.98 MeV (0.35 ± 0.1%) and 3.4 MeV (0.22 ± 0.05%). Coincidence measurements suggest that the 2.55 and 3.4 MeV γ-rays are due to de-excitation of a level at about 3.4 MeV which decays both to the ground and first excited states. A spin of 2 for this state is proposed.

Scattering of 100-MeV protons by 11B and 16O

1970 ◽  
Vol 48 (6) ◽  
pp. 765-774 ◽  
Author(s):  
A. J. Houdayer ◽  
T. Y. Li ◽  
S. K. Mark
Keyword(s):  
Excited State ◽  
Elastic Scattering ◽  
Inelastic Scattering ◽  
Excited States ◽  
Optical Potential ◽  
Optical Model ◽  
Experimental Results ◽  
Optical Model Analysis ◽  
Potential Parameters ◽  
Mev Protons

The scattering of 100-MeV protons from 11B and 16O has been studied. An optical-model analysis of the elastic scattering on these nuclei has been performed and a consistent set of optical potential parameters which gave a good fit to the experimental results was obtained. In the inelastic scattering on 11B, it has been found that the first and third excited states were weakly excited whereas the second excited state was fairly strongly excited. The results were explained in terms of the unified model.

scholarly journals Cis and trans linkage of spin frustrated copper triangles creating Cu6 clusters

2020 ◽  
Author(s):  
Basharat Ali ◽  
Frédéric Gendron ◽  
Xiao-Lei Li ◽  
Boris Le Guennic ◽  
Jinkui Tang
Keyword(s):  
Experimental Data ◽  
Excited State ◽  
Ground State ◽  
Magnetic Data ◽  
Antiferromagnetic Coupling ◽  
First Excited State ◽  
B3lyp Calculations ◽  
Frustrated Systems ◽  
Cis And Trans ◽  
Good Agreement

Two C3-symmetric guanidine-based copper triangles bridged by acetates in a cis manner and by chloride anions in a trans manner, respectively gave rise to two antiferromagnetically coupled hexanuclear CuII compounds, namely [Cu6L2Cl(μ-OAc)(DMF)3]·DMF (Cu6) and [Cu6L2(μ-Cl)2(DMF)4] (Cu6Cl)(where L stands for fully deprotonated tris (2-hydroxybenzylidene) triaminoguanidinium chloride, H5L). The experimental magnetic data of the two compounds were analyzed theoretically. A relatively good agreement with the experimental data was obtained when using the wavefunction theory (CASSCF) in combination with DFT (B3LYP) calculations for the very strong antiferromagnetic coupling within the Cu3 triangles (Javg = − 300 cm−1 for Cu6 and Javg = − 250 cm−1 for Cu6Cl), leading to spin-frustrated systems. It is worth mentioning that the electronic structure of each CuII center remains very similar in each complex with a Kramers ground state well separated from the first excited state (over 12000 cm−1) and weakly anisotropic (g∥ ≈ 2.40 and g⊥ ≈ 2.10).

Low lying levels in 81Br

1969 ◽  
Vol 47 (20) ◽  
pp. 2255-2259 ◽  
Author(s):  
M. Salomon ◽  
C. Hojvat
Keyword(s):  
Excited State ◽  
Energy Level ◽  
Excited States ◽  
Ground State ◽  
Level Scheme ◽  
Coulomb Excitation ◽  
Transition Probability ◽  
Energy Level Scheme ◽  
First Excited State

Coulomb excitation of Br targets and the reaction 80Se(p,γ)81Br were used to populate the low lying excited states of 81Br and an energy level scheme is proposed. The reduced transition probability from the ground state to the first excited state of 81Br (276 keV) has been measured to be B(E2) = 410 ± 40 e2 f4.

Messung der Lebensdauer des 87 keV-Niveaus von 160Dy

1962 ◽  
Vol 17 (8) ◽  
pp. 638-640 ◽  
Author(s):  
F. W. Richter ◽  
D. Wiegandt
Keyword(s):  
Excited State ◽  
Half Life ◽  
Coulomb Excitation ◽  
First Excited State ◽  
Good Agreement

Measuring the half-life of the first excited state of 160Dy we got T12= (2,24 ± 0,06) ns. instead of (1,8 ± 0,2) ns given by McGOWAN 1. This value is in good agreement with COULOMB-excitation data

Relativistic Ground and Excited State Energies of a/1-Particle in Hypernuclei Using Woods-Saxon Potentials

1989 ◽  
Vol 44 (12) ◽  
pp. 1234-1238 ◽  
Author(s):  
C. G. Koutroulos
Keyword(s):  
Excited State ◽  
Dirac Equation ◽  
Excited States ◽  
Ground State ◽  
Scalar Potential ◽  
Binding Energies ◽  
Fitting Procedure ◽  
Fourth Component ◽  
Potential Parameters ◽  
Good Agreement

Abstract The relativistic Dirac equation with a scalar potential and the fourth component of a vector potential of the Woods-Saxon shape is solved numerically for potential parameters obtained by a last squares fitting procedure of the ground state binding energies of the Λ in a number of hypernuclei and its binding energies in the ground and excited states (as well as the relevant spacings) for various hypcrnuclei are determined. The results are in very good agreement with the preliminary experimental ones given by Chrien on the basis of the (π+, K+) reaction on nuclei.

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