Hybrid random-phase-approximation–cluster model for the dipole strength function ofLi11

1991 ◽  
Vol 43 (5) ◽  
pp. R2049-R2051 ◽  
Author(s):  
N. Teruya ◽  
C. A. Bertulani ◽  
S. Krewald ◽  
H. Dias ◽  
M. S. Hussein
Keyword(s):  
Cluster Model ◽  
Random Phase Approximation ◽  
Strength Function ◽  
Random Phase ◽  
Phase Approximation ◽  
Dipole Strength

scholarly journals Collectivity of the low-lying dipole strength in relativistic random phase approximation

2001 ◽  
Vol 692 (3-4) ◽  
pp. 496-517 ◽  
Author(s):  
D. Vretenar ◽  
N. Paar ◽  
P. Ring ◽  
G.A. Lalazissis
Keyword(s):  
Random Phase Approximation ◽  
Random Phase ◽  
Phase Approximation ◽  
Dipole Strength

E1 STRENGTH IN LIGHT NUCLEI: SKYRME RPA ANALYSIS

2012 ◽  
Vol 21 (05) ◽  
pp. 1250041 ◽  
Author(s):  
J. KVASIL ◽  
A. REPKO ◽  
V. O. NESTERENKO ◽  
W. KLEINIG ◽  
P.-G. REINHARD
Keyword(s):  
Random Phase Approximation ◽  
Random Phase ◽  
Light Nuclei ◽  
Strong Impact ◽  
Phase Approximation ◽  
Experiment Data ◽  
Dipole Strength ◽  
Dipole Resonance ◽  
Double Folding ◽  
Acceptable Agreement

The giant dipole resonance (GDR) in N = 28 isotones (48 Ca , 50 Ti , 52 Cr , 54 Fe ) is analyzed in the framework of the Skyrme random-phase-approximation (RPA). Three Skyrme forces, SkM*, SLy6 and SV-bas, are used. The effects beyond RPA are simulated by the double folding procedure. We show that dipole strength exhibits a large collective shift, which testifies to a strong impact of the residual interaction and signals on considerable anharmonic effects. In 52 Cr , a significant pairing impact is found. For exception of 50 Ti , an acceptable agreement with the experiment data is obtained, which justifies the ability of Skyrme forces to describe GDR in light nuclei.

scholarly journals Microscopic description of the pygmy dipole resonance in neutron-rich Ca isotopes

2018 ◽  
Vol 194 ◽  
pp. 04002
Author(s):  
N.N. Arsenyev ◽  
A.P. Severyukhin ◽  
V.V. Voronov ◽  
N.V. Giai
Keyword(s):  
Electric Dipole ◽  
Random Phase Approximation ◽  
Strength Function ◽  
Random Phase ◽  
Strength Distribution ◽  
Low Energy ◽  
Dipole Strength ◽  
Quasiparticle Random Phase Approximation ◽  
Dipole Resonance ◽  
Dipole Response

We study the effects of the phonon-phonon coupling on the low-energy electric dipole response within a microscopic model based on an effective Skyrme interaction. The finite rank separable approach for the quasiparticle random phase approximation is used. Choosing as an example the isotopic chain of Calcium, we show the ability of the method to describe the low-energy E1 strength distribution. With one and the same set of parameters we describe available experimental data for 48Ca and predict the electric dipole strength function for 50Ca.

scholarly journals γ-ray strength function for astrophysical applications in the IAEA-CRP

2020 ◽  
Vol 239 ◽  
pp. 07005
Author(s):  
Hiroaki Utsunomiya ◽  
Stephane Goriely ◽  
Therese Renstrøm ◽  
Gry M. Tveten ◽  
Takashi Ari-izumi ◽  
...  
Keyword(s):  
Cross Sections ◽  
Random Phase Approximation ◽  
Function Method ◽  
Strength Function ◽  
Random Phase ◽  
Phase Approximation ◽  
Quasiparticle Random Phase Approximation ◽  
Hartree Fock ◽  
Γ Ray

The γ-ray strength function (γSF) is a nuclear quantity that governs photoabsorption in (γ, n) and photoemission in (n, γ) reactions. Within the framework of the γ-ray strength function method, we use (γ, n) cross sections as experimental constraints on the γSF from the Hartree-Fock-Bogolyubov plus quasiparticle-random phase approximation based on the Gogny D1M interaction for E1 and M1 components. The experimentally constrained γSF is further supplemented with the zero-limit M1 and E1 strengths to construct the downward γSF with which (n, γ) cross sections are calculated. We investigate (n, γ) cross sections in the context of astrophysical applications over the nickel and barium isotopic chains along the s-process path.

scholarly journals Recent applications of the subtracted SRPA approximation

2019 ◽  
Vol 223 ◽  
pp. 01020
Author(s):  
Danilo Gambacurta
Keyword(s):  
Random Phase Approximation ◽  
Large Scale ◽  
Random Phase ◽  
Natural Extension ◽  
Phase Approximation ◽  
Dipole Strength ◽  
Subtraction Procedure ◽  
Quadrupole Resonance ◽  
Spherical Nuclei ◽  
The One

The Second Random Phase Approximation (SRPA) is a natural extension of the Random Phase Approximation obtained by introducing more general excitation operators where two particle-two hole configurations, in addition to the one particle-one hole ones, are considered. Only in the last years, large-scale SRPA calculations, without usually employed approximations have been performed. The SRPA model corrected by a subtraction procedure designed to cure double counting issues and the related instabilities has been recently implemented and applied in the study of different physical cases. We report here on some of the most recent results obtained by using this model. In particular, results on the dipole strength 48Ca and on a systematic study of the isoscalar giant quadrupole resonance in spherical nuclei will be shown and discussed.

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