Zr90(p,n) and (n,p) distorted-wave impulse approximation cross sections in 2p2h random-phase approximation

1988 ◽  
Vol 37 (3) ◽  
pp. 1322-1325 ◽  
Author(s):  
J. Wambach ◽  
S. Drod ◽  
A. Schulte ◽  
J. Speth
Keyword(s):  
Cross Sections ◽  
Random Phase Approximation ◽  
Random Phase ◽  
Impulse Approximation ◽  
Phase Approximation ◽  
Distorted Wave ◽  
Distorted Wave Impulse Approximation

Relativistic-random-phase approximation calculations of atomic photoionization: what we have learned

2009 ◽  
Vol 87 (1) ◽  
pp. 5-8 ◽  
Author(s):  
S T Manson
Keyword(s):  
Angular Distribution ◽  
Cross Sections ◽  
Random Phase Approximation ◽  
Random Phase ◽  
Branching Ratios ◽  
Phase Approximation ◽  
The Past ◽  
Photoionization Process ◽  
Photoelectron Angular Distribution ◽  
Made In

The relativistic-random-phase approximation (RRPA) methodology, developed by Walter Johnson and his collaborators, has been used extensively over the past three decades to calculate various aspects of the atomic photoionization process, cross sections, and branching ratios along with dipole and nondipole contributions to the photoelectron angular distribution. In this paper, some of the progress made in our understanding of the photoionization process as a result of RRPA calculations is reviewed.PACS No.: 32.80.Fb

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 Neutral current neutrino-94Mo scattering in the context of the QRPA method

2019 ◽  
Vol 18 ◽  
pp. 31
Author(s):  
K. G. Balasi ◽  
T. S. Kosmas
Keyword(s):  
Cross Sections ◽  
Random Phase Approximation ◽  
Neutral Current ◽  
Random Phase ◽  
Reaction Rates ◽  
Systematic Investigation ◽  
Wave Functions ◽  
Phase Approximation ◽  
Quasi Particle ◽  
Intermediate Energies

A systematic investigation of neutrino-nucleus reaction rates at low and intermediate energies of the stable 94Mo isotope is performed. Differential and integrated cross sections for neutrino inelastic scattering off the aforementioned target are calculated for neutrino energies εi ≼ 100 MeV. The nuclear wave functions for the initial and final nuclear states are constructed in the context of the quasi-particle random phase approximation (QRPA). The reliability of our method is tested by checking the reproducibility of the low-lying energy spectrum of the isotope under investigation.

Photoproduction of positive pions from 16O at medium energies

1980 ◽  
Vol 58 (8) ◽  
pp. 1151-1162 ◽  
Author(s):  
V. Devanathan ◽  
V. Girija ◽  
G. N. Sivarama Prasad
Keyword(s):  
Experimental Data ◽  
Nuclear Structure ◽  
Cross Sections ◽  
Impulse Approximation ◽  
Wave Functions ◽  
Fair Agreement ◽  
Free Nucleon ◽  
Distorted Wave ◽  
Distorted Wave Impulse Approximation ◽  
Γ Ray

The reaction 16O(γ,π+)16N has been studied in the distorted wave impulse approximation (DWIA) using the free-nucleon photopion amplitude. The nuclear distortion effects on the emitted pion and also the effect of nuclear structure are investigated in detail. The effect of nuclear distortion is found to be small at lower energies but is of great importance resulting in large absorption of pions around the (3,3) resonance. Using realistic nuclear wave functions, it is found that the DWIA yields cross sections in fair agreement with the experimental data at γ-ray energies above 230 MeV but higher values at lower energies.

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