scholarly journals Self-consistent separable random-phase approximation for Skyrme forces: Giant resonances in axial nuclei

2006 ◽  
Vol 74 (6) ◽  
Author(s):  
V. O. Nesterenko ◽  
W. Kleinig ◽  
J. Kvasil ◽  
P. Vesely ◽  
P.-G. Reinhard ◽  
...  
Keyword(s):  
Random Phase Approximation ◽  
Random Phase ◽  
Phase Approximation ◽  
Giant Resonances ◽  
Self Consistent

COLLECTIVE BANDS IN SUPERDEFORMED NUCLEI

2008 ◽  
Vol 17 (01) ◽  
pp. 196-203
Author(s):  
J. KVASIL ◽  
N. LO IUDICE ◽  
F. ANDREOZZI ◽  
A. PORRINO ◽  
F. KNAPP
Keyword(s):  
Comparative Analysis ◽  
Random Phase Approximation ◽  
Random Phase ◽  
Anomalous Behavior ◽  
Yrast Band ◽  
Phase Approximation ◽  
Giant Resonances ◽  
Quasiparticle Random Phase Approximation ◽  
Self Consistent ◽  
Dynamical Moment

The collective properties of excited superdeformed bands have been investigated in the framework of self-consistent cranked Nilsson plus quasiparticle random-phase approximation. The expected octupole nature of some bands observed recently in some nuclei has been confirmed by a comparative analysis of their E1 decays to the yrast band and of the anomalous behavior of their dynamical moment of inertia. It is also shown that the onset of supederformation affects considerably the structure of the giant resonances and greatly enhances the collectivity of the low-lying scissors mode.

scholarly journals SKYRME-RANDOM-PHASE-APPROXIMATION DESCRIPTION OF SPIN-FLIP AND ORBITAL M1 GIANT RESONANCES

2010 ◽  
Vol 19 (04) ◽  
pp. 558-567 ◽  
Author(s):  
V. O. NESTERENKO ◽  
J. KVASIL ◽  
P. VESELY ◽  
W. KLEINIG ◽  
P.-G. REINHARD
Keyword(s):  
Random Phase Approximation ◽  
Random Phase ◽  
Proton Spin ◽  
Qualitative Description ◽  
Phase Approximation ◽  
Isotopic Chain ◽  
Giant Resonances ◽  
Peak Structure ◽  
Spin Flip ◽  
Self Consistent

The self-consistent separable random-phase approximation (SRPA) with Skyrme forces is extended to the case of magnetic excitations and applied to the description of spin-flip and orbital M1 giant resonances in the isotopic chain 142-152 Nd . The Skyrme forces SkT6, SkM*, SLy6 and SkI3 are used. The calculations show an onset of the scissors mode with increasing deformation. A specific three-peak structure of the spin-flip response is found and explained by particular neutron and proton spin-flip transitions. Although the employed forces provide an acceptable qualitative description, the Skyrme functional still needs further improvement to reproduce quantitatively the experiment for spin modes.

THE NUMBER SELF-CONSISTENT RENORMALIZED RANDOM PHASE APPROXIMATION

2006 ◽  
Vol 20 (30n31) ◽  
pp. 5334-5337
Author(s):  
A. MARIANO
Keyword(s):  
Charge Exchange ◽  
Random Phase Approximation ◽  
Random Phase ◽  
Critical Value ◽  
Phase Approximation ◽  
Heavy Nuclei ◽  
Electromagnetic Transitions ◽  
Self Consistent ◽  
Eigen Values ◽  
Beta Decays

RPA and its quasiparticle generalization (QRPA) have been widely used to study electromagnetic transitions and beta decays in medium and heavy nuclei, being the pn-QRPA charge exchange mode extensively employed in the description of single and double beta decays in vibrational nuclei. However develops a collapse, i.e. it presents imaginary eigen-values for strengths beyond a critical value of the force. Extensions called renormalized QRPA (RQRPA) do not develop any collapse going beyond the simplest quasiboson approximation, however they present several drawbacks which will be analyzed.

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