scholarly journals Inelastic Scattering from 20Ne

1991 ◽  
Vol 44 (3) ◽  
pp. 217 ◽  
Author(s):  
K Amos ◽  
L Berge ◽  
C Steward ◽  
R de Swiniarski
Keyword(s):  
Reaction Mechanism ◽  
Inelastic Scattering ◽  
Ground State ◽  
Microscopic Model ◽  
Hartree Fock ◽  
Rotation Band ◽  
Coupled Channels ◽  
Reaction Data ◽  
Energy Reaction ◽  
Mev Protons

Inelastic scattering of 800 MeV protons exciting states of the ground state rotation band of 20Ne is studied using large basis space, microscopic model (Hartree-Fock) wavefunctions and free two-nucleon t-matrices, one of which is based upon the Paris interaction. Results are compared with coupled channels analyses of the data made using Dirac as well as Schrodinger phenomenology. Thereby it is suggested that coupled channels effects in the reaction mechanism are essential in analysis of such higher energy reaction data.

scholarly journals Excitation of the Ground-State Rotational Band in 28Si by Inelastic Scattering of 25.25 MeV Polarized Protons

1973 ◽  
Vol 51 (12) ◽  
pp. 1293-1299 ◽  
Author(s):  
R. de Swiniarski ◽  
H. E. Conzett ◽  
C. R. Lamontagne ◽  
B. Frois ◽  
R. J. Slobodrian
Keyword(s):  
Inelastic Scattering ◽  
Cross Sections ◽  
Ground State ◽  
Optical Potential ◽  
Great Sensitivity ◽  
Angular Distributions ◽  
Rotational Model ◽  
Coupled Channels ◽  
Polarized Protons ◽  
State Band

Angular distributions of the analyzing power and cross sections have been measured for the elastic and inelastic scattering of 25.25 MeV protons exciting the K = 0+ ground-state band in 28Si. Good agreement with experiment is obtained in the coupled-channels formalism on the basis of the rotational model with a quadrupole deformation β2 = −0.40 (oblate) and a hexadecapole deformation β4 = +0.15. The calculations show the great sensitivity of the experimental results to both the magnitude and sign of the quadrupole and hexadecapole deformations. Equivalent fits of the data were obtained either by keeping the deformation length of the various deformed terms of the optical potential constant (δ0 = β0R0 = βIRI = βLSRLS) or by increasing the deformation of the spin–orbit optical potential relative to the central potential by a factor of 1.5 (βLS = 1.5βcent).

The inelastic scattering of protons by magnesium, aluminium and other light elements

1950 ◽  
Vol 201 (1066) ◽  
pp. 348-365 ◽  
Keyword(s):  
Angular Distribution ◽  
Energy Spectrum ◽  
Inelastic Scattering ◽  
Excitation Function ◽  
Ground State ◽  
Proportional Counter ◽  
Complex Structure ◽  
Theoretical Discussion ◽  
Light Elements ◽  
Mev Protons

The energy spectrum of 4.5 MeV protons scattered by some light elements was determined by using a proportional counter in conjunction with absorbing foils. Magnesium gave groups attributed to levels at 1.36 ± 0.03 and 1.82 ± 0.04 MeV respectively above the ground state, the former being almost certainly associated with 24 Mg. The angular distribution and excitation function of this group were examined in some detail. The proton groups from aluminium corresponded to levels at about 1 and 2.15 ± 0.05 MeV respectively above the ground state. The lower level has a complex structure and probably consists of two levels at about 0.80 and 0.97 ± 0.02 MeV, the amplitudes of the corresponding proton groups showing a marked angular dependence. No inelastically scattered protons were observed from carbon, oxygen, or copper, while beryllium gave a group consistent with the existence of a metastable state in 9 Be at 2.39 ± 0.05 MeV above the ground state. A short theoretical discussion of the mechanism of the process is given which suggests that inelastic scattering is predominantly a ( p, p ) process involving formation of a compound nucleus.

Multipole Deformations in 19F and in the Neon Isotopes and Electric Multipole Strength in 19F from Inelastic Scattering of 30 MeV Protons

1974 ◽  
Vol 52 (23) ◽  
pp. 2422-2435 ◽  
Author(s):  
R. De Swiniarski ◽  
A. Genoux-Lubain ◽  
G. Bagieu ◽  
J. F. Cavaignac
Keyword(s):  
Inelastic Scattering ◽  
Cross Sections ◽  
Coulomb Excitation ◽  
Low Energy ◽  
Transition Strength ◽  
Coupled Channels ◽  
Inelastic Proton Scattering ◽  
Major Discrepancy ◽  
Mev Protons ◽  
Good Agreement

Cross sections were measured for inelastic scattering of 30 MeV protons from 19F, 20Ne, 21Ne, and22Ne. The cross sections of the ground state rotational band in these nuclei were analyzed in the coupled channels formalism and yield further evidence for a large hexadecapole deformation in 19F (β4 = 0.14 ± 0.04) and in 20Ne (β4 = 0.28 ± 0.05) in good agreement with several recent proton inelastic scattering experiments. These calculations show also that the Y4 moment is small or close to zero in 21Ne and 22Ne (β4 ≤ 0.05). The analysis of the available 19F cross section in the DWBA formalism shows evidence for a large and significant octupole transition strength for the 1.35 MeV (5/2−) (3.6 W.u.), the 5.43 MeV (7/2−) state (6.70 W.u.), and the 5.63 MeV (5/2−) state (3.60 W.u.). The measured transition strengths are generally in disagreement with recent low energy (α, α′) or (d, d′) results but also with the earlier Coulomb excitation measurements. Thus, we confirm that a major discrepancy still exists between inelastic scattering and Coulomb excitation of the octupole transition strength to several states in 19F but mainly to the 1.35 MeV (5/2−) state as was already pointed out some time ago from a low energy inelastic proton scattering experiment. On a mesuré les sections efficaces pour la diffusion inélastique de protons de 30 MeV excitant les noyaux 19F, 20Ne, 21Ne et 22Ne.

Correlation in the Ground State of He Atom

1981 ◽  
Vol 36 (3) ◽  
pp. 272-275 ◽  
Author(s):  
Subal Chandra Saha ◽  
Sankar Sengupta
Keyword(s):  
Ground State ◽  
Zero Order ◽  
Consistent Variation ◽  
Hartree Fock ◽  
Perturbation Procedure ◽  
Self Consistent ◽  
He Atom ◽  
Atomic Parameters

It is possible to reproduce the entire results of Pekeris et al. of different atomic parameters for the He atom by introducing (ll) type correlation in a self consistent variation perturbation procedure using the Hartree-Fock (HF) wavefunction as the zero-order wavefunction

scholarly journals THE METHOD OF INCREMENTS — A WAVEFUNCTION-BASED AB-INITIO CORRELATION METHOD FOR SOLIDS

2007 ◽  
Vol 21 (13n14) ◽  
pp. 2204-2214 ◽  
Author(s):  
BEATE PAULUS
Keyword(s):  
Experimental Data ◽  
Ab Initio ◽  
Ground State ◽  
Infinite System ◽  
Correlation Energy ◽  
Correlation Method ◽  
Many Body ◽  
Hartree Fock ◽  
The Many ◽  
Good Agreement

The method of increments is a wavefunction-based ab initio correlation method for solids, which explicitly calculates the many-body wavefunction of the system. After a Hartree-Fock treatment of the infinite system the correlation energy of the solid is expanded in terms of localised orbitals or of a group of localised orbitals. The method of increments has been applied to a great variety of materials with a band gap, but in this paper the extension to metals is described. The application to solid mercury is presented, where we achieve very good agreement of the calculated ground-state properties with the experimental data.

scholarly journals Ground state properties of graphene in Hartree-Fock theory

2012 ◽  
Vol 53 (9) ◽  
pp. 095220 ◽  
Author(s):  
Christian Hainzl ◽  
Mathieu Lewin ◽  
Christof Sparber
Keyword(s):  
Ground State ◽  
Hartree Fock ◽  
Ground State Properties
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