Systematical studies of the 
E1
 photon strength functions combining the Skyrme-Hartree-Fock-Bogoliubov plus quasiparticle random-phase approximation model and experimental giant dipole resonance properties

Abstract The excitation of pygmy dipole resonance (PDR) and giant dipole resonance (GDR) in even-even 154-164Dy isotopes is examined through quasiparticle random-phase approximation (QRPA) with the effective interactions that restores the broken translational and Galilean invariances. In each isotope, an electric response emerges by showing ample distribution at energies below and above 10 MeV. We, therefore, study the transition cross sections and probabilities, photon strength functions, transition strengths, isospin character, and collectivity of the predicted E1 responses.

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TENSOR EFFECTS IN PYGMY DIPOLE EXCITATION

International Journal of Modern Physics E ◽

10.1142/s0218301311020216 ◽

2011 ◽

Vol 20 (10) ◽

pp. 2143-2151 ◽

Cited By ~ 2

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.

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

EPJ Web of Conferences ◽

10.1051/epjconf/202023907005 ◽

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.

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