scholarly journals Cross sections of proton capture reactions of Sr isotopes

2019 ◽  
Vol 11 ◽  
Author(s):  
S. Galanopoulos ◽  
P. Demetriou ◽  
M. Kokkoris ◽  
G. Kriembardis ◽  
S. Harissopulos ◽  
...  
Keyword(s):  
Cross Sections ◽  
Relative Efficiency ◽  
Background Suppression ◽  
Proton Capture ◽  
Total Cross Sections ◽  
Model Code ◽  
Hpge Detectors ◽  
Theoretical Predictions ◽  
Compton Background ◽  
Good Agreement

Cross section measurements of the proton capture reactions of the 86Sr, 87Sr and 88Sr isotopes were carried out at energies Ep=1.4-5 MeV. At Ep <3.5 MeV an array of 4 HPGe detectors with 100% relative efficiency shielded with BGO scintillators for Compton background suppression was used, whereas at Ep >3.5 MeV, the measurements were performed by means of one HPGe detector of 80% relative efficiency. For the 87Sr(p,7)88Y and 88Sr(p,7)89Y reactions total cross sections ranging from 0.5 μο-5 mb were found. The data analysis of the 86Sr(p,7)87Y reaction is in progress. Cross sections have also been calculated by means of the statistical model code MOST. A very good agreement between the experimental data and the theoretical predictions has been found.

scholarly journals Cross section measurements of the 7 8Se(p,7)7 9Br and 8 0Se(p,7)8 1Br reactions

2019 ◽  
Vol 11 ◽  
Author(s):  
G. Kriembardis ◽  
S. Galanopoulos ◽  
P. Demetriou ◽  
S. Harissopulos ◽  
M. Fey ◽  
...  
Keyword(s):  
Experimental Data ◽  
Cross Section ◽  
Cross Sections ◽  
Preliminary Analysis ◽  
High Efficiency ◽  
Background Suppression ◽  
Total Cross Sections ◽  
Hpge Detectors ◽  
Theoretical Predictions ◽  
Compton Background

In beam cross section measurements of the 78Se(p,7)79Br and 80Se(p,7)81Br reactions have been carried out at Ep=1.4-3.5 MeV, by using high efficiency HPGe detectors with BGO shields for Compton background suppression. A preliminary analysis yielded total cross sections ranging from 10 μb to 3 mb. By means of the statistical compound nucleus theory of Hauser-Feshbach cross sections have also been calculated. A comparison between experimental data and theoretical predictions is presented.

scholarly journals Cross sections of the 89Y(p,γ) reaction relevant to the p process

2019 ◽  
Vol 11 ◽  
Author(s):  
P. Tsagari ◽  
M. Kokkoris ◽  
E. Skreti ◽  
P. Demetriou ◽  
S. Galanopoulos ◽  
...  
Keyword(s):  
Statistical Theory ◽  
Angular Distribution ◽  
Cross Section ◽  
Cross Sections ◽  
Relative Efficiency ◽  
Reaction Rates ◽  
Hpge Detectors ◽  
The Cross ◽  
Good Agreement

The cross section of the 89Y(p,7)90Zr reaction was determined at Ep=l.4-4.8 MeV via angle-integrated measurements carried out by means of a 4π Nal summing detector as well as via angular distribution measurements using an array of 4 HPGe detectors with 100% relative efficiency. The resulting cross sections vary from 0.5 to 5 mb. Astrophysical S factors and reaction rates have also been derived. A good agreement between the experimental rates and and the predictions of statistical theory has been found.

scholarly journals Energy Dependence of Total Cross Sections for Reactions with 4, 6he, 6, 7, 9li Nuclei

KnE Energy ◽  
2018 ◽  
Vol 3 (1) ◽  
pp. 21
Author(s):  
Yu Penionzhkevich ◽  
Yu Sobolev ◽  
V Samarin ◽  
M Naumenko
Keyword(s):  
Experimental Data ◽  
Energy Range ◽  
Numerical Solution ◽  
Energy Dependence ◽  
Cross Sections ◽  
Beam Energy ◽  
Microscopic Analysis ◽  
Time Dependent ◽  
Total Cross Sections ◽  
Good Agreement

The paper presents the results of measurement of the total cross sections for reactions 4,6He + Si and 6,7,9Li + Si in the beam energy range 5−50 A⋅MeV. The enhancements of the total cross sections for reaction 6He + Si compared with reaction 4He + Si, and 9Li + Si compared with reactions 6,7Li + Si have been observed. The performed microscopic analysis of total cross sections for reactions 6He + Si and 9Li + Si based on numerical solution of the time-dependent Schrödinger equation for external neutrons of projectile nuclei 6He and 9Li yielded good agreement with experimental data.

Low-energy positron–hydrogen molecule scattering

1982 ◽  
Vol 60 (4) ◽  
pp. 597-600 ◽  
Author(s):  
Sukanya Sur ◽  
A. S. Ghosh
Keyword(s):  
Cross Sections ◽  
Effective Potential ◽  
Qualitative Agreement ◽  
Hydrogen Molecule ◽  
Low Energy ◽  
Total Cross Sections ◽  
Model Potentials ◽  
Theoretical Predictions ◽  
Molecule Scattering

The method of Hara using two centre formalism has been employed to investigate positron–hydrogen molecule scattering at low incident energies. Two model potentials have been used to see the importance of the choice of effective potential. It has been found that the total cross sections are sensitive to the details of the effective potential. The present results are in qualitative agreement with measured values and other existing theoretical predictions.

scholarly journals Ground State Positronium Formation Cross Sections for Scattering of Positrons from Li

1991 ◽  
Vol 44 (5) ◽  
pp. 515 ◽  
Author(s):  
KK Mukherjee ◽  
N Ranjit Singh ◽  
Keka Basu Choudhury ◽  
PS Mazumdar ◽  
S Brajamani
Keyword(s):  
Energy Range ◽  
Cross Sections ◽  
Ground State ◽  
Positronium Formation ◽  
Distorted Wave ◽  
Total Cross Sections ◽  
Wave Approximation ◽  
Theoretical Predictions

Total cross sections for positronium formation in e+-Li scattering have been studied in the framework of the distorted wave approximation in the energy range 1-50 eV by taking consistent account of the effect of the target distortion. The results are compared with existing theoretical predictions.

scholarly journals Modeling radiative proton-capture reactions in mid-heavy nuclei

2019 ◽  
Vol 23 ◽  
pp. 146
Author(s):  
E. Batziou ◽  
V. Koutsilianou ◽  
L. Stavropoulos ◽  
A. Psaltis ◽  
T. J. Mertzimekis
Keyword(s):  
Experimental Data ◽  
Cross Sections ◽  
Systematic Study ◽  
Low Energy ◽  
Heavy Nuclei ◽  
Proton Capture ◽  
Experimental Conditions ◽  
Energy Regime ◽  
Theoretical Predictions ◽  
Near Future

A systematic study of (p,γ) reactions was carried out using the reaction codes EMPIRΕ, TALYS and NON-SMOKER (web). The calculated (p,γ) cross sections of seed nuclei 89Y, 107,109Ag, 106,108,110Pd, 112Cd, 121,123Sb, 127I, and 133Cs can be used in a three-fold way: (a) perform an intercomparison of the models in a low-energy regime (b) compare existing experimental data to the theoretical predictions and (c) predict cross sections of reactions planned to be studied experimentally in the near future by our group. The results of the study are presented in a concise way focusing on the experimental conditions.

Gamma-ray yields from the reaction D(p, γ)3He at low energies

1970 ◽  
Vol 48 (24) ◽  
pp. 3059-3061 ◽  
Author(s):  
G. M. Bailey ◽  
G. M. Griffiths ◽  
M. A. Olivo ◽  
R. L. Helmer
Keyword(s):  
Energy Range ◽  
Cross Sections ◽  
Gamma Ray ◽  
Total Cross Sections ◽  
Isotropic Component ◽  
Low Energies ◽  
Theoretical Predictions ◽  
Γ Ray ◽  
Deuterated Polyethylene

Total cross sections and measurements of the small isotropic component of the γ-ray yield from the reaction D(p, γ)3He have been determined in the energy range from 57 to 1100 KeV using gas and deuterated polyethylene targets. The results are compared with some theoretical predictions.

Reaction mechanism of the 16O + d reactions

1970 ◽  
Vol 48 (19) ◽  
pp. 2235-2253 ◽  
Author(s):  
N. E. Davison ◽  
W. K. Dawson ◽  
G. Roy ◽  
W. J. McDonald
Keyword(s):  
Experimental Data ◽  
Compound Nucleus ◽  
Cross Sections ◽  
Direct Interaction ◽  
Scattering Data ◽  
Orbit Potential ◽  
Spectroscopic Factors ◽  
Theoretical Predictions ◽  
Using Data ◽  
Good Agreement

The reactions 16O(d,d)16O, 16O(d,p)17O, and 16O(d,n)17F have been studied in the deuteron energy range 4.00–6.00 MeV in order to determine to what extent current theories can satisfactorily describe these reactions. It was found that the theoretical curves from both the optical and DWBA models fit the experimental data significantly better when the deuteron optical-model potentials had been obtained using a spin–orbit potential in the analysis of the elastic scattering data. Spectroscopic factors obtained for the ground and first-excited states of 17O and 17F using the DWBA theory are in satisfactory agreement with theoretical predictions and with values obtained by previous workers. Small, but nonzero, spectroscopic factors have been obtained for the states at 3.058 and 3.846 MeV excitation in 17O using data measured in this work and in previous experiments. The sum of the calculated direct interaction and compound-nucleus cross sections is in good agreement with experimental data for all states studied, whether they were populated primarily by direct or compound-nucleus reactions. The calculated compound-nucleus lifetimes are also in agreement with values obtained from an analysis of the fluctuations in the yield curves.

scholarly journals Elastic Scattering of Electron and Positron by Radium and Radon Atoms

2021 ◽  
Vol 13 (01) ◽  
pp. 1-11
Author(s):  
A .K. Yassir ◽  
◽  
A. H. Hussain ◽  
F. A. Ali ◽  
◽  
...  
Keyword(s):  
Elastic Scattering ◽  
Cross Sections ◽  
Differential Cross ◽  
Exchange Potential ◽  
Positron Scattering ◽  
Total Cross Sections ◽  
Total Potential ◽  
Correlation Potential ◽  
Experimental Values ◽  
Good Agreement

The Differential Cross Sections (DCS's), Total Cross Sections (TCS's) and Momentum Transfer Cross Sections (MTCS's) of electron and positron scattering by radium and radon atoms were calculated in the range of energy (5–500) eV using a total potential consisting of combining the static, exchange and polarization potentials at long distances. In addition, the correlation potential of Perdew–Zunger at short distances for electrons was used, as well as the correlation potential of Jain for positrons. The exchange potential for positrons was neglected. In this study, a good agreement with other experimental values and theoretical values of many investigators was found.

scholarly journals Single electron capture into arbitrary states of bare projectiles from multi-electron targets

2018 ◽  
Vol 16 (2) ◽  
pp. 239-247
Author(s):  
Nenad Milojevic ◽  
Ivan Mancev
Keyword(s):  
Electron Capture ◽  
Cross Sections ◽  
Single Electron ◽  
Final States ◽  
Total Cross Sections ◽  
Single Electron Capture ◽  
Body Boundary ◽  
Impact Energies ◽  
Good Agreement ◽  
Prior Form

The prior form of four-body boundary-corrected first Born (CB1-4B) method is applied to calculate the total cross sections for single electron capture from the Kshell of multi-electron atoms (C, N, O, Ar) by fast projectiles (H+, He2+and Li3+). All calculations are carried out for electron capture into the arbitrary n, l, and m final states of the projectiles. The present results are found to be in very good agreement with the available experimental data at intermediate and high impact energies.

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