scholarly journals Extension of the random phase approximation including the self-consistent coupling to two-phonon contributions

2003 ◽  
Vol 68 (1) ◽  
Author(s):  
C. Barbieri ◽  
W. H. Dickhoff
Keyword(s):  
Random Phase Approximation ◽  
Random Phase ◽  
The Self ◽  
Phase Approximation ◽  
Self Consistent

scholarly journals SPECTROSCOPIC FACTORS IN 16O AND NUCLEON ASYMMETRY

2009 ◽  
Vol 24 (11) ◽  
pp. 2060-2068 ◽  
Author(s):  
C. BARBIERI ◽  
W. H. DICKHOFF
Keyword(s):  
Random Phase Approximation ◽  
Green's Functions ◽  
Green’S Functions ◽  
Collective Excitation ◽  
Random Phase ◽  
Heavy Ion ◽  
The Self ◽  
Phase Approximation ◽  
Spectroscopic Factors ◽  
Self Consistent

The self-consistent Green's functions method is employed to study the spectroscopic factors of quasiparticle states around 16,28 O and 40,60 Ca . The Faddeev random phase approximation (FRPA) is used to account for the coupling of particles with collective excitation modes. Results for 16 O are reviewed first. The same approach is applied to isotopes with large proton-neutron asymmetry to estimate its effect on spectroscopic factors. The results, based on the chiral N3LO force, exhibit an asymmetry dependence similar to that observed in heavy-ion knockout experiments but weaker in magnitude.

scholarly journals SKYRME-RANDOM-PHASE-APPROXIMATION DESCRIPTION OF E1 STRENGTH IN 92–100Mo

2009 ◽  
Vol 18 (04) ◽  
pp. 975-985 ◽  
Author(s):  
J. KVASIL ◽  
P. VESELY ◽  
V. O. NESTERENKO ◽  
W. KLEINIG ◽  
P.-G. REINHARD ◽  
...  
Keyword(s):  
Energy Region ◽  
Random Phase Approximation ◽  
Compensation Effect ◽  
Giant Resonance ◽  
Random Phase ◽  
Low Energy ◽  
The Self ◽  
Nuclear Deformation ◽  
Phase Approximation ◽  
Self Consistent

The isovector dipole E1 strength in 92,94,96,98,100 Mo is analyzed within the self-consistent separable random-phase approximation (SRPA) model with Skyrme forces SkT6, SkM*, SLy6, and SkI3. The special attention is paid to the low-energy region near the particle thresholds (4-12 MeV), which is important for understanding of astrophysical processes. We show that, due to a compensation effect, the influence of nuclear deformation on E1 strength below 10-12 MeV is quite modest. At the same time, in agreement with previous predictions, the deformation increases the strength at higher energy. At 4-8 MeV the strength is mainly determined by the tail of E1 giant resonance. The four Skyrme forces differ in description of the whole giant resonance but give rather similar results below 12 MeV.

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