Determinations of fission cross-sections and fission yields from proton induced fission reactions of 232Th, 233,235,236,238U, 237Np and 239Pu

2021 ◽  
Author(s):  
İsmail Hakki Sarpün ◽  
Hüseyin Ali Yalim ◽  
Abdullah Aydin ◽  
Eyyup Tel ◽  
Ferhan Akdeniz ◽  
...  
Keyword(s):  
Experimental Data ◽  
Cross Sections ◽  
Reaction Cross ◽  
Fission Barrier ◽  
Barrier Heights ◽  
Calculation Results ◽  
Induced Fission ◽  
Fission Yields ◽  
Reaction Cross Sections ◽  
Barrier Model

In this work, the proton induced fission reaction cross-sections and fission yields are calculated for some actinides [Formula: see text], [Formula: see text], [Formula: see text], and [Formula: see text] using the fission barrier models of the TALYS 1.95 code. Cross-sections and fission yield calculations are carried out up to 100 MeV incident proton energies. The calculation results are compared with the available experimental data in the EXFOR library. In addition, a relative variance analysis of fission barrier models was done to determine the fission barrier model whose results best matched with the experimental results. Among the fission barrier models, the best agreement with the experimental data is obtained from the rotating-finite-range fission barrier model calculation for the [Formula: see text] reaction of the studied nuclei having the atomic mass number larger than 230. On the other hand, fission barrier heights for the studied reactions are determined using the same models.

scholarly journals Theoretical calculation and evaluation of neutron inducedreactions on Pu isotopes

2020 ◽  
Vol 239 ◽  
pp. 03008
Author(s):  
Hairui Guo ◽  
Yinlu Han ◽  
Tao Ye ◽  
Weili Sun ◽  
Wendi Chen
Keyword(s):  
Experimental Data ◽  
Cross Sections ◽  
Nuclear Data ◽  
Reaction Cross ◽  
Driven Systems ◽  
Intranuclear Cascade ◽  
Pu Isotopes ◽  
Design Requirements ◽  
Accelerator Driven Systems ◽  
Reaction Cross Sections

The nuclear data on n+239,240,242,244Pu reactions for the incident energy up to 200 MeV are consistently calculated and evaluated in order to meet the design requirements of Generation-IV reactors and accelerator driven systems. The optical model, the distorted wave Born approximation theory, the Hauser-Feshbach theory, the fission model, the evaporation model, the exciton model and the intranuclear cascade model are used in the calculation, and new experimental data are taken into account. Our data are compared with experimental data and the evaluated data from JENDL-4/HE and TENDL. In addition, the variation tendency of reaction cross sections related to the target mass numbers is obtained, which is very important for the prediction of nuclear data on neutron-actinides reactions because the experimental data are lacking.

scholarly journals Statistical-model calculations for α-capture reactions relevant to the p process

2019 ◽  
Vol 26 ◽  
pp. 228
Author(s):  
C. Fakiola ◽  
I. Karakasis ◽  
I. Sideris ◽  
A. Khaliel ◽  
T. J. Mertzimekis
Keyword(s):  
Experimental Data ◽  
Statistical Model ◽  
Cross Sections ◽  
Theoretical Calculations ◽  
Reaction Network ◽  
Reaction Cross ◽  
Model Parameters ◽  
Model Calculations ◽  
Reaction Channels ◽  
Reaction Cross Sections

About 35 nuclides which lie on the neutron deficient side of the isotopic chart cannot be created by the two basic nucleosynthetic processes, the sand the rprocess. Due to scarce experimental data and the vast complexity of the reaction network involved, cross sections and reactions are estimated theoretically, using the Hauser–Feshbach statistical model. In the present work, theoretical calculations of cross sections of radiative α-capture reactions on the neutron–deficient Erbium and Xenon isotopes are presented in an attempt to make predictions inside the astrophysically relevant energy window (Gamow). The particular reactions are predicted to be sensitive branchings in the γprocess path.The most recent versions of TALYS (v1.9) and Fresco codes were employed for all calculations, initially focusing on investigating the influence of the default eight (8) α–nucleus optical potential models of TALYS on reaction cross sections. The theoretical results of both codes are compared and for the reactions where experimental data exist in literature, the optical model parameters were adjusted appropriately to best describe the data and were subsequently used for estimating (α,γ) reaction cross sections. Predictions for the (α,n) reaction channels have also been calculated and studied.

NUCLEAR REACTION CROSS-SECTION FOR DRIP-LINE NUCLEI IN THE FRAMEWORK OF GLAUBER MODEL USING RELATIVISTIC AND NONRELATIVISTIC DENSITIES

2013 ◽  
Vol 22 (01) ◽  
pp. 1350005 ◽  
Author(s):  
MAHESH K. SHARMA ◽  
M. S. MEHTA ◽  
S. K. PATRA
Keyword(s):  
Experimental Data ◽  
Nuclear Reaction ◽  
Cross Section ◽  
Cross Sections ◽  
Reaction Cross Section ◽  
Mass Region ◽  
Reaction Cross ◽  
Drip Line ◽  
Glauber Model ◽  
Reaction Cross Sections

We study the nuclear reaction cross-sections for some of the neutron-rich nuclei in the lighter mass region of the periodic chart which are recently measured. The well-known Glauber formalism is used by taking deformed relativistic and nonrelativistic densities as input in the calculations. We find reasonable reaction cross-sections with both the densities. However with a better inspection of the results, it is noticed that the results obtained with relativistic densities are more closure to the experimental data than the nonrelativistic Skyrme densities.

Production cross-sections of superheavy elements using nearly double magic nuclei as projectile

2017 ◽  
Vol 26 (07) ◽  
pp. 1750050
Author(s):  
Ahmad Ansari ◽  
Nader Ghahramany
Keyword(s):  
Experimental Data ◽  
Cross Sections ◽  
Production Cross ◽  
Evaporation Residue ◽  
Fission Barrier ◽  
Superheavy Nuclei ◽  
New Approach ◽  
Barrier Heights ◽  
Compound Nucleus Formation ◽  
Good Agreement

In our new approach, evaporation residue cross-sections for new superheavy nuclei with atomic numbers [Formula: see text] are estimated by calculation of vital characteristics of superheavy nuclei synthesis such as the fission barrier height, the compound nucleus formation probability and the survival probability of the residue nuclei. Our presented estimation is in good agreement with available experimental data. In addition, this new approach allowed us to predict the evaporation residue cross-sections for superheavy nuclei with [Formula: see text] and 120 via introducing synthesis box and compare our results with other models. It is shown that the fission barrier heights of two nuclei with [Formula: see text] and 120 are comparable with their corresponding neutron separation energies. It is suggested that for the synthesis of new superheavy nuclei, it is proper to use nearly double magic nuclei such as [Formula: see text] as our projectile, so that the fission barrier heights remain high.

scholarly journals Fragmentation analysis of 88Mo* compound nucleus in view of different decay mechanisms

2020 ◽  
Vol 232 ◽  
pp. 03004
Author(s):  
Neha Grover ◽  
Bhaktima Thakur ◽  
Manoj K. Sharma
Keyword(s):  
Experimental Data ◽  
Cross Sections ◽  
Reaction Cross ◽  
Cluster Decay ◽  
Compound System ◽  
Total Contribution ◽  
Nice Agreement ◽  
Collective Clusterization ◽  
Critical Angular Momentum ◽  
Reaction Cross Sections

In reference to the experimental data, the decay mechanism of 88Mo* compound system formed in 48Ti+40Ca reaction is investigated at three beam energies (Ebeam = 300, 450, and 600 MeV) using the collective clusterization approach of Dynamical Cluster decay Model (DCM). The calculations are done for spherical choice of fragmentation and with the inclusion of quadrupole (β2) deformations having “optimum” orientations. According to the experimental evidence 88Mo* decays via Fusion-Evaporation (FE) and Fusion-Fission (FF) processes, thus the decay cross-sections of this hot and rotating compound system are calculated for both channels. In FF decay mode, the explicit contribution of Intermediate Mass Fragments (IMF), Heavy Mass Fragments (HMF) and fission fragments (symmetric/asymmetric) is detected within DCM framework. The calculated FE and FF decay cross-sections find nice agreement with the available experimental data. Experimentally, it has been observed that the total contribution of FE and FF decay cross-sections is less than the total reaction cross-sections possibly due to the presence of some nCN component such as deep inelastic collisions (DIC), which generally contributes above critical angular momentum (ℓcr). The possibility of DIC contribution can be addressed as a future assignment in view of diminishing pocket of interaction potential above ℓcr.

THE DYNAMICAL ISOSPIN EFFECT ON PROTON-INDUCED REACTIONS ON Sn ISOTOPES

2008 ◽  
Vol 17 (09) ◽  
pp. 1648-1659
Author(s):  
ZHUXIA LI ◽  
LI OU
Keyword(s):  
Experimental Data ◽  
Elastic Scattering ◽  
Density Dependence ◽  
Cross Sections ◽  
Symmetry Energy ◽  
Reaction Cross ◽  
Quantum Molecular Dynamics ◽  
Incident Proton ◽  
Spallation Reactions ◽  
Reaction Cross Sections

In this talk we present a model, Improved Quantum Molecular Dynamics (ImQMD05) model incorporated with a Statistical Decay Model (SDM), to describe intermediate energy proton induced spallation reactions. A good agreement with experimental data of double differential cross sections of emitted neutrons is obtained. We further apply this model to study the isospin effect in proton induced spallation reactions on a series Sn isotope targets. We find that the systematic behavior of the reaction cross sections for Sn isotope targets deviates from the empirical expression obtained by fitting the experimental data for proton induced spallation reactions on target nuclei along β-stability line. The extent of the deviation depends on the density dependence of the symmetry energy strongly. We also find an obvious shift of the elastic scattering angular distribution of emitted protons when the symmetry energy is taken into account for neutron-rich Sn isotope targets and the angle shifted strongly depends on the stiffness of the symmetry energy. The attractive effect of the symmetry potential of target on incident proton directly influences the motion of the incident proton leading to strong isospin effect on the reaction dynamics and thus on these reaction observables. We conclude that the measurement of reaction cross sections and the elastic scattering angular distributions in proton induced spallation reactions on Sn isotopes can provide clear constraint for the density dependence of symmetry energy.

scholarly journals Photoneutron reaction cross sections for 75As and 181Ta: Sytematic uncertainties and data reliability

2020 ◽  
Vol 239 ◽  
pp. 01035
Author(s):  
Vladimir Varlamov ◽  
Alexander Davydov ◽  
Boris Ishkhanov ◽  
Valeriya Kaidarova ◽  
Vadim Orlin
Keyword(s):  
Experimental Data ◽  
Cross Sections ◽  
Reaction Cross ◽  
Data Reliability ◽  
Photoneutron Reaction ◽  
Physical Data ◽  
Reaction Cross Sections

There is well-known problem of significant systematic disagreements between data for reactions (γ, 1n), (γ, 2n), obtained at Livermore (USA) and Saclay (France) using the method of photoneutron multiplicity sorting. The averaged ratios RS/Lint of integrated cross sections obtained at Saclay and Livermore for 19 nuclei from 51V to 239U are equal to 0.84 for (γ, 2n) and 1.07 for (γ, 1n) reactions. For 75As RS/Lint ratios for both partial reactions are very close (1.22 and 1.21) but for 181Ta - are quite different (0.89 and 1.25). Using the objective physical data reliability criteria it was found that there are serious doubts in reliability of Saclay and Livermore data. The newly evaluated reliable cross sections disagree with experimental data. In addition to unreliable sorting of many neutrons between both partial reactions many neutrons were lost - on the case of 181Ta in 1n channel, in the case of 75As in both 1n and 2n channels.

Lack of Evidence for Shell Effects in the (n,p) and (n,α) Reaction Cross Sections at 14 MeV Neutron Energy

1970 ◽  
Vol 25 (12) ◽  
pp. 1977
Author(s):  
S.M. Qaim
Keyword(s):  
Experimental Data ◽  
Neutron Energy ◽  
Cross Sections ◽  
Nuclear Reactions ◽  
Magic Number ◽  
Reaction Cross ◽  
Conclusive Evidence ◽  
Shell Effects ◽  
Reaction Cross Sections ◽  
Proton Shell

Abstract The systematics of cross sections for (n,p) and (n,a) re-actions induced by 14 - 15 MeV neutrons have been reinvesti-gated. No clear evidence for the existence of any proton shell effects in these two reactions was found. The existence of shell effects in nuclear reactions induced by 14 - 15 MeV neutrons has been postulated by several workers1-4 , but the evidence presented has been rather weak. With the availability of more and better experimental data in recent years, a fresh look at this postulate seemed highly desirable. In case of (n,p) and (n,2n) reactions, the claim for the occurence of shell effects has already been recently repudiated5,6 ; but for (n,α) reactions there seems to exist no evidence against the original claims1,2 that the cross section shows a minimum when the atomic number of the re-sidual nucleus is a magic number. The present article describes briefly a reinvestigation of the systematics of the (n,p) and (n,α) reaction cross sections in the light of the latest experimental data. At 14 MeV neutron energy there appears to be no conclusive evidence for any significant proton shell effects in these two re-actions.

A study of the energy dependence for the multiplicity of shower particles produced in a 16O–emulsion interaction in the framework of the Coulomb-modified Glauber model

2008 ◽  
Vol 86 (10) ◽  
pp. 1209-1217 ◽  
Author(s):  
M.S.M. Nour El-Din ◽  
M E Solite
Keyword(s):  
Experimental Data ◽  
Cross Sections ◽  
Reaction Cross ◽  
Average Multiplicity ◽  
Glauber Model ◽  
Total Reaction ◽  
Binary Collisions ◽  
Reaction Cross Sections ◽  
Calculated Average ◽  
Good Agreement

The total reaction cross sections for the interaction of 16O with emulsion nuclei (16O–Em) at energies: 0.2, 2.1, 3.6, 14.6, 60.0, and 200.0A GeV have been calculated in the framework of the Coulomb-modified Glauber model. A similar calculation in case of proton–emulsion (p–Em) interactions is carried out at the same energies. For both types of interactions, the corresponding projectile and target participants beside the corresponding binary collisions have been calculated for the same energies. Then the averages of these quantities have been obtained. These averages have been used in the calculations of the corresponding average multiplicity of the shower particles (s-particles) in the case of the 16O–Em interaction. The agreement between the calculated total reaction cross sections and the corresponding experimental data is quite good. Also, a good agreement between the calculated average multiplicities of the shower particles and the corresponding experimental data has been obtained.PACS Nos.: 24.10.Cn, 24.10.Ht, 25.60.Dz

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