A systematic study was conducted on the theoretical estimation of the nuclear cross sections of charged particle induced reactions on rare earth nuclei.The production cross sections of the ^(150,149,148,146,144,143,14...A systematic study was conducted on the theoretical estimation of the nuclear cross sections of charged particle induced reactions on rare earth nuclei.The production cross sections of the ^(150,149,148,146,144,143,141)Pm and ^(149,147)Nd nuclei were calculated theoretically via proton induced reactions on neodymium using TALYS(version 1.96)code in the default mode,with different combinations of nuclear models as well as adjusted nuclear model parameters from the reaction threshold up to a proton energy of 65 MeV.The theoretically computed results were compared with the experimental results taken from the EXFOR database and literature reported by various research groups.Moreover,the effects of various level density models,preequilibrium models,optical model potentials,and gamma strength functions on the cross section calculation were considered.This theoretical analysis will help elucidate the theory of nuclear reaction models and improve the evaluated nuclear data libraries.展开更多
TALYS calculations were performed to obtain the theoretical proton capture cross-sections on the p-nuclei.A short review on the status of related experimental studies was also conducted.Some basic properties such as Q...TALYS calculations were performed to obtain the theoretical proton capture cross-sections on the p-nuclei.A short review on the status of related experimental studies was also conducted.Some basic properties such as Q-values,Coulomb barrier,Gamow peak,Gamow Window,and decay properties of the parent and daughter nuclei were studied.Various experimental parameters,e.g.,beam energy,beam current,targets,and detectors,used in experimental investigations reported in the literature,were tabulated.The results of the TALYS calculations in the Gamow region were compared with the corresponding experimental values wherever available.This study is expected to facilitate the planning of future experiments.展开更多
To ensure agreement between theoretical calculations and experimental data,parameters to selected nuclear physics models are perturbed and fine-tuned in nuclear data evaluations.This approach assumes that the chosen s...To ensure agreement between theoretical calculations and experimental data,parameters to selected nuclear physics models are perturbed and fine-tuned in nuclear data evaluations.This approach assumes that the chosen set of models accurately represents the‘true’distribution of considered observables.Furthermore,the models are chosen globally,indicating their applicability across the entire energy range of interest.However,this approach overlooks uncertainties inherent in the models themselves.In this work,we propose that instead of selecting globally a winning model set and proceeding with it as if it was the‘true’model set,we,instead,take a weighted average over multiple models within a Bayesian model averaging(BMA)framework,each weighted by its posterior probability.The method involves executing a set of TALYS calculations by randomly varying multiple nuclear physics models and their parameters to yield a vector of calculated observables.Next,computed likelihood function values at each incident energy point were then combined with the prior distributions to obtain updated posterior distributions for selected cross sections and the elastic angular distributions.As the cross sections and elastic angular distributions were updated locally on a per-energy-point basis,the approach typically results in discontinuities or“kinks”in the cross section curves,and these were addressed using spline interpolation.The proposed BMA method was applied to the evaluation of proton-induced reactions on ^(58)Ni between 1 and 100 MeV.The results demonstrated a favorable comparison with experimental data as well as with the TENDL-2023 evaluation.展开更多
基金ICFAI University Tripura for all their help and support in carrying out the research
文摘A systematic study was conducted on the theoretical estimation of the nuclear cross sections of charged particle induced reactions on rare earth nuclei.The production cross sections of the ^(150,149,148,146,144,143,141)Pm and ^(149,147)Nd nuclei were calculated theoretically via proton induced reactions on neodymium using TALYS(version 1.96)code in the default mode,with different combinations of nuclear models as well as adjusted nuclear model parameters from the reaction threshold up to a proton energy of 65 MeV.The theoretically computed results were compared with the experimental results taken from the EXFOR database and literature reported by various research groups.Moreover,the effects of various level density models,preequilibrium models,optical model potentials,and gamma strength functions on the cross section calculation were considered.This theoretical analysis will help elucidate the theory of nuclear reaction models and improve the evaluated nuclear data libraries.
基金funded by DST,Govt.of India,under the WOS-A scheme(Reference No.:SR/WOS-A/PM-68/2017)。
文摘TALYS calculations were performed to obtain the theoretical proton capture cross-sections on the p-nuclei.A short review on the status of related experimental studies was also conducted.Some basic properties such as Q-values,Coulomb barrier,Gamow peak,Gamow Window,and decay properties of the parent and daughter nuclei were studied.Various experimental parameters,e.g.,beam energy,beam current,targets,and detectors,used in experimental investigations reported in the literature,were tabulated.The results of the TALYS calculations in the Gamow region were compared with the corresponding experimental values wherever available.This study is expected to facilitate the planning of future experiments.
基金funding from the Paul ScherrerInstitute,Switzerland through the NES/GFA-ABE Cross Project。
文摘To ensure agreement between theoretical calculations and experimental data,parameters to selected nuclear physics models are perturbed and fine-tuned in nuclear data evaluations.This approach assumes that the chosen set of models accurately represents the‘true’distribution of considered observables.Furthermore,the models are chosen globally,indicating their applicability across the entire energy range of interest.However,this approach overlooks uncertainties inherent in the models themselves.In this work,we propose that instead of selecting globally a winning model set and proceeding with it as if it was the‘true’model set,we,instead,take a weighted average over multiple models within a Bayesian model averaging(BMA)framework,each weighted by its posterior probability.The method involves executing a set of TALYS calculations by randomly varying multiple nuclear physics models and their parameters to yield a vector of calculated observables.Next,computed likelihood function values at each incident energy point were then combined with the prior distributions to obtain updated posterior distributions for selected cross sections and the elastic angular distributions.As the cross sections and elastic angular distributions were updated locally on a per-energy-point basis,the approach typically results in discontinuities or“kinks”in the cross section curves,and these were addressed using spline interpolation.The proposed BMA method was applied to the evaluation of proton-induced reactions on ^(58)Ni between 1 and 100 MeV.The results demonstrated a favorable comparison with experimental data as well as with the TENDL-2023 evaluation.
