Charge exchange response functions of finite nucleus by an extended Skyrme interaction

2014 ◽  
Vol 23 (06) ◽  
pp. 1460001
Author(s):  
Pei-Wei Wen ◽  
Li-Gang Cao
Keyword(s):  
Spin Density ◽  
Response Function ◽  
Charge Exchange ◽  
Random Phase ◽  
Specific Effect ◽  
Skyrme Interaction ◽  
Finite Nucleus ◽  
Density Dependent ◽  
Hartree Fock ◽  
Peak Energy

The charge exchange resonances in finite nucleus, such as Gamow–Teller (GT) and Spin-Dipole (SD) resonances, have been studied in a self-consistent Hartree–Fock (HF) plus random phase approximation (RPA) approach by employing an extended Skyrme interaction with spin-density dependent terms. The calculations are performed within the KDE0v1 and KDE0v1st Skyrme interactions. The peak energy of GT response function is increased by about 1.4 MeV when the spin-density dependent terms are included. For total response function of SD resonance, the spin-density dependent terms give an overall repulsive contribution to the strength. The specific effect for each multipole presents a multipole dependence.

TENSOR EFFECTS IN PYGMY DIPOLE EXCITATION

2011 ◽  
Vol 20 (10) ◽  
pp. 2143-2151 ◽  
Author(s):  
ESRA YUKSEL ◽  
KUTSAL BOZKURT
Keyword(s):  
Random Phase Approximation ◽  
Random Phase ◽  
Nucleon Nucleon ◽  
Coupling Constants ◽  
Phase Approximation ◽  
Skyrme Interaction ◽  
Quasiparticle Random Phase Approximation ◽  
Tensor Coupling ◽  
Hartree Fock ◽  
Dipole Excitation

We investigate tensor effects in pygmy dipole excitations for the case of neutron-rich nuclei 68 Ni and 124 Sn using effective nucleon–nucleon Skyrme interaction. We use the Hartree–Fock–Bogoliubov (HFB) theory and employ the quasiparticle random phase approximation (QRPA). We calculate and compare the PDR and also GDR strength in the PDR–GDR energy region for QRPA calculations with and without tensor correlations. The most obvious results for the dipole excitations calculations are strongly dependent on the tensor terms. We see that the tensor correlations are more active at around 14–20 MeV , especially for the neutron-rich nuclei 68 Ni . We also compare the PDR calculations with their experimental results for the different proton–neutron tensor coupling constants.

EXTENDED SKYRME INTERACTION IN THE SPIN CHANNEL

2010 ◽  
Vol 25 (21n23) ◽  
pp. 1771-1774 ◽  
Author(s):  
J. MARGUERON ◽  
S. GORIELY ◽  
M. GRASSO ◽  
G. COLÒ ◽  
H. SAGAWA
Keyword(s):  
Binding Energy ◽  
Nuclear Matter ◽  
Spin Density ◽  
Ground State ◽  
Saturation Density ◽  
Total Binding Energy ◽  
Skyrme Interaction ◽  
Spin Channel ◽  
Density Dependent ◽  
Total Binding

Most of the Skyrme interactions are known to predict spin or isospin instabilities beyond the saturation density of nuclear matter which contradict predictions based on realistic interactions. A modification of the standard Skyrme interaction is proposed so that the ferromagnetic instability is removed. The new terms are density dependent and modify only the spin p - h interaction in the case of spin-saturated system. We have shown that these new terms change the total binding energy of odd-nuclei by only few tenths of keV. From the analysis of the spin instabilities of nuclear matter, restrictions on the parameters governing the spin-density dependent terms are evaluated. We conclude that with the extended Skyrme interaction, the Landau parameters G0 and [Formula: see text] could be tuned with a large flexibility without changing the ground-state properties in nuclei and in nuclear matter.

Hartree–Fock Alpha Cluster Density Distributions in Light A = 4n Nuclei Using Density Dependent Effective Interactions

1973 ◽  
Vol 51 (24) ◽  
pp. 2522-2549 ◽  
Author(s):  
K. R. Lassey ◽  
M. R. P. Manning ◽  
A. B. Volkov
Keyword(s):  
Delta Function ◽  
Skyrme Interaction ◽  
Effective Interactions ◽  
Density Dependent ◽  
Hartree Fock ◽  
Density Distributions ◽  
Cluster Density ◽  
The One ◽  
Alpha Cluster ◽  
Selection Of

Hartree–Fock calculations have been performed for the A = 4n nuclei 12C to 40Ca, employing a selection of density dependent effective interactions. This selection consists of two density and momentum dependent delta function interactions, similar to the Skyrme interaction, and two density and momentum dependent finite range interactions whose radial forms are given as a sum of two Gaussian functions. A basis of single-particle axially deformed harmonic oscillator functions is used. Special emphasis is given to the study of the occurrence of alpha-particle type clustering in the density distributions of light A = 4n nuclei and the influence of the strength of the one-body spin–orbit field.

Brueckner-Hartree-Fock Calculations Using Density-Dependent Effective Interactions. Application toO16

1972 ◽  
Vol 5 (1) ◽  
pp. 41-53 ◽  
Author(s):  
Neal E. Reid ◽  
Manoj K. Banerjee ◽  
G. J. Stephenson
Keyword(s):  
Effective Interactions ◽  
Density Dependent ◽  
Hartree Fock

scholarly journals DENSITY-DEPENDENT PHONORITON STATES IN HIGHLY EXCITED SEMICONDUCTORS

1995 ◽  
Vol 09 (28) ◽  
pp. 3725-3733
Author(s):  
NGUYEN HONG QUANG ◽  
NGUYEN MINH KHUE
Keyword(s):  
Green's Function ◽  
Random Phase Approximation ◽  
Function Method ◽  
Random Phase ◽  
High Density ◽  
Phase Approximation ◽  
Green’S Function Method ◽  
Exciton Density ◽  
Density Dependent ◽  
Exciton Interaction

The dynamical aspects of the phonoriton state in highly-photoexcited semiconductors is studied theoretically. The effect of the exciton–exciton interaction and nonbosonic character of high-density excitons are taken into account. Using Green's function method and within the Random Phase Approximation it is shown that the phonoriton dispersion and damping are very sensitive to the exciton density, characterizing the excitation degree of semiconductors.

scholarly journals RELATIVE MOTION CORRECTION TO FISSION BARRIERS

2008 ◽  
Vol 17 (01) ◽  
pp. 151-159 ◽  
Author(s):  
J. SKALSKI
Keyword(s):  
Relative Motion ◽  
Cluster Model ◽  
Motion Correction ◽  
Mean Field Theory ◽  
Mean Field ◽  
Ternary Fission ◽  
Skyrme Interaction ◽  
Hartree Fock ◽  
Fission Barriers ◽  
The Mean

We discuss the effect of kinetic energy of the relative motion becoming spurious for separate fragments on the selfconsistent mean-field fission barriers. The treatment of the relative motion in the cluster model is contrasted with the necessity of a simpler and approximate approach in the mean-field theory. A scheme of the energy correction to the Hartree-Fock is proposed. The results obtained with the effective Skyrme interaction SLy 6 show that the correction, previously estimated as ~ 8 MeV in A = 70 - 100 nuclei, amounts to 4 MeV in the medium heavy nucleus 198 Hg and to null in 238 U . However, the corrected barrier implies a shorter fission half-life of the latter nucleus. The same effect is expected to lower barriers for multipartition (i.e. ternary fission, etc) and make hyperdeformed minima less stable.

Potential barrier effect and discrete structure o between 40 and 120 Å in the Rb I absorption spectrum

1975 ◽  
Vol 344 (1637) ◽  
pp. 303-309 ◽  
Keyword(s):  
Absorption Spectrum ◽  
Absorption Maximum ◽  
Random Phase Approximation ◽  
Random Phase ◽  
Particle Model ◽  
Discrete Structure ◽  
Model Calculations ◽  
Hartree Fock ◽  
Independent Particle ◽  
Independent Particle Model

Investigation of the Rb I absorption spectrum between 40 and 120 Å has revealed a broad absorption maximum in the 3d photoionization continuum, as well as discrete features associated with the excitation of a 3d-subshell electron. The discrete structure is identified, Hartree-Fock calculations of the transition energies are given and the absorption maximum is discussed in relation to similar spectra and to recent random phase approximation with exchange (r.p.a.e.) and independent particle model calculations.

Sign in / Sign up

Export Citation Format

Share Document