Validation of Monte Carlo simulation of neutron production in a spallation experiment

Zavorka, Lukas; Adam, J.; Artiushenko, M.; Baldin, A. A.; Brudanin, V.; Bukhal, O.V.; Čaloun, P.; Chilap, V.; Furman, W.; Husak, K.V.; Kadykov, M.; Katovsky, Karel; Khushvaktov, J.; Mar’in, I.; Pronskikh, Vitaly; Solnyshkin, A. A.; Sotnikov, V. V.; Stegailov, V. I.; Suchopar, M.; Svoboda, O.; Tsoupko‐Sitnikov, V. M.; Tyutyunnikov, S.I.; Voronko, V.; Vrzalova, J.; Wagner, V.; Zhivkov, Petar; Zhuk, I.V.

doi:10.1016/j.anucene.2015.02.010

Cited by 15 publications

(9 citation statements)

References 35 publications

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“…To improve the prediction accuracy of the model, a suitable kernel function must be selected in SVM model. The better modeling parameters will be picked by using the RBF kernel function (De & Santin, ) and cross validation method (Zavorka et al, ) in this experiment. Spectral data is assumed as matrix ( x i , y i ), i = 1,2,…, n , where n is the number of calibration set, x i is the characteristic band of samples,

x \in R^{d}

and y i is the category label of samples ( y i

\in

(+1,−1)).…”

Section: Theory and Algorithmsmentioning

confidence: 99%

Discrimination of pesticide residues in lettuce based on chemical molecular structure coupled with wavelet transform and near infrared hyperspectra

Sun

Zhou

Mao³

et al. 2016

J Food Process Engineering

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To facilitate more quickly and effectively detect the types of pesticide residues on the surface of lettuce, a method involving the chemical molecular structure coupled with wavelet transform (CMS‐WT) was proposed to extract the characteristic wavelength. Five different kinds of pesticide residues were sprayed on the surface of lettuce, respectively, dimethoate, acephate, phoxim, dichlorvos, avermectin (the ratio of pesticides and water were 1:1000). In addition, the near infrared hyperspectral image information of 200 samples in five different kinds of pesticides residue in lettuce were achieved by the NIR hyperspectral imaging system (870–1780 nm). The region of interest (ROI) in hyperspectral image of samples was selected to get the near infrared spectral data by the software of ENVI. Furthermore, CMS‐WT was used to extract the most influential wavelengths. Four characteristic intervals were extracted by comparing the different of pesticides in chemical molecular structures, respectively, 875—1050 nm, 1050—1250 nm, 1350—1550 nm, 1650—1780 nm. Further, the best combination of eight features were selected according to the reorder of the size of the singular value by wavelet transform algorithm using db6 as wavelet basis function, respectively, 919.18, 944.25, 972.25, 1194.20, 1363.81, 1426.69, 1673.29, 1680.74 nm. Finally, SVM model was established according to the extracted characteristic spectral data. The results showed that the calibration and prediction accuracy of SVM model established by the best combination of eight features were all achieved 100%. It confirms that the CMS‐WT feature extraction algorithm is feasible and effective for building models of different pesticide residues in lettuce. Practical applications Well understanding the effect of pesticide residues to biological structure is very important for revelation of novel biological function and mechanism of action of the protein. To facilitate more quickly and effectively detect the types of pesticide residues on the surface of lettuce, a method involving the chemical molecular structure coupled with wavelet transform (CMS‐WT) was proposed to extract the characteristic wavelength in this article. It confirms that the CMS‐WT feature extraction algorithm is feasible and effective for building models of different pesticide residues in lettuce.

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x \in R^{d}

and y i is the category label of samples ( y i

\in

(+1,−1)).…”

Section: Theory and Algorithmsmentioning

confidence: 99%

Discrimination of pesticide residues in lettuce based on chemical molecular structure coupled with wavelet transform and near infrared hyperspectra

Sun

Zhou

Mao³

et al. 2016

J Food Process Engineering

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“…Results from integral benchmark experiments performed at massive natural uranium target QUINTA shows, that different event generators play an important role in final agreement between experimental and calculated quantities [3,4].…”

Section: Introductionmentioning

confidence: 99%

Cross-sections of residual nuclei from deuteron irradiation of thin thorium target at energy 7 GeV

et al. 2017

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Abstract. The residual nuclei yields are of great importance for the estimation of basic radiation-technology characteristics (like a total target activity, production of long-lived nuclides etc.) of accelerator driven systems planned for transmutation of spent nuclear fuel and for a design of radioisotopes production facilities. Experimental data are also essential for validation of nuclear codes describing various stages of a spallation reaction. Therefore, the main aim of this work is to add new experimental data in energy region of relativistic deuterons, as similar data are missing in nuclear databases. The sample made of thin natural thorium foil was irradiated at JINR Nuclotron accelerator with a deuteron beam of the total kinetic energy 7 GeV. Integral number of deuterons was determined with the use of aluminum activation detectors. Products of deuteron induced spallation reaction were qualified and quantified by means of gamma-ray spectroscopy method. Several important spectroscopic corrections were applied to obtain results of high accuracy. Experimental cumulative and independent cross-sections were determined for more than 80 isotopes including metastable isomers. The total uncertainty of results rarely exceeded 9%. Experimental results were compared with MCNP6.1 Monte-Carlo code predictions. Generally, experimental and calculated cross-sections are in a reasonably good agreement, with the exception of a few light isotopes in a fragmentation region, where the calculations are highly under-estimated. Measured data will be useful for future development of high-energy nuclear codes. After completion, final data will be added into the EXFOR database.

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“…The eciency of the neutron production based on spallation reaction depends on many parameters such as: beam energy, kind of particles and kind and size of target [3,4,6]. These neutrons can be employed for transmutation of the long-lived isotopes existing in nuclear waste [5,7,9] and for nuclear energy production from thorium or spent uranium fuel [1,2,8,9]. The main aim of this work is to analyze the U-238(n,f) and U-238(n,g) reactions in QUINTA assembly [7,9].…”

Section: Introductionmentioning

confidence: 99%

“…The electronuclear method of neutron generation using a spallation reaction in Accelerator Driven System (ADS) has been studied by many scientist worldwide [1][2][3][4][5][6][7][8][9]. The eciency of the neutron production based on spallation reaction depends on many parameters such as: beam energy, kind of particles and kind and size of target [3,4,6].…”

Section: Introductionmentioning

confidence: 99%

“…These neutrons can be employed for transmutation of the long-lived isotopes existing in nuclear waste [5,7,9] and for nuclear energy production from thorium or spent uranium fuel [1,2,8,9]. The main aim of this work is to analyze the U-238(n,f) and U-238(n,g) reactions in QUINTA assembly [7,9]. This work presents a comparison of experimental data and calculated results predicted by MCNPX code [10].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

U-238 fission and Pu-239 production in subcritical assembly

Grab

Wojciechowski

2018

EPJ Web Conf.

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Abstract. The project touches upon an issue of U-238 ssion reactions and Pu-239 production reactions in subcritical assembly. The experiment took place in November 2014 at the Dzhelepov Laboratory of Nuclear Problems (JINR, Dubna) using PHASOTRON.Data of this experiment were analyzed in Laboratory of Information Technologies (LIT). Four MCNPX models were considered for simulation: Bertini/Dresnen, Bertini/Abla, INCL4/Drensnen, INCL4/Abla. The main goal of the project was to compare the experimental data and simulation results. We obtain a good agreement of experimental data and computation results especially for detectors placed besides the assembly axis. In addition, the U-238 ssion reactions are more probable to be observed in the region of a higher particle energy spectrum, located closer to the assembly axis and the particle beam as well and vice versa Pu-239 production reactions were dominant in the peripheral region of geometry.

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Validation of Monte Carlo simulation of neutron production in a spallation experiment

Cited by 15 publications

References 35 publications

Discrimination of pesticide residues in lettuce based on chemical molecular structure coupled with wavelet transform and near infrared hyperspectra

Discrimination of pesticide residues in lettuce based on chemical molecular structure coupled with wavelet transform and near infrared hyperspectra

Cross-sections of residual nuclei from deuteron irradiation of thin thorium target at energy 7 GeV

U-238 fission and Pu-239 production in subcritical assembly

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