MCNPX 2.7.0 extensions

Pelowitz, Denise B.; Durkee, Joe W.; Elson, Jay S.; Fensin, Michael L; Hendricks, John S.; James, Michael R.; Johns, Russell C.; Kinney, Fregg W Mc; Mashnik, S. G.; Waters, L.; Wilcox, Trevor A; Verbeke, Jérome

doi:10.2172/1058045

Cited by 247 publications

(276 citation statements)

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“…5, the inverse cross sections used by these models at the preequilibrium stage (and at the evaporation/fission stage) have a significant impact on the calculated particle width, and affect greatly the final results and the accuracy of the MCNP6, MCNPX [52] and MARS15 [53] transport codes, which use these models as their event generators. This is why it is necessary to use as good as possible approximations for the inverse cross sections in the extended models.…”

Section: Extending the Preequilibrium Modelmentioning

confidence: 99%

Production of energetic light fragments in extensions of the CEM and LAQGSM event generators of the Monte Carlo transport code MCNP6

et al. 2017

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We extend the cascade-exciton model (CEM), and the Los Alamos version of the quark-gluon string model (LAQGSM), event generators of the Monte-Carlo N-particle transport code version 6 (MCNP6), to describe production of energetic light fragments (LF) heavier than 4 He from various nuclear reactions induced by particles and nuclei at energies up to about 1 TeV/nucleon. In these models, energetic LF can be produced via Fermi break-up, preequilibrium emission, and coalescence of cascade particles. Initially, we study several variations of the Fermi break-up model and choose the best option for these models. Then, we extend the modified exciton model (MEM) used by these codes to account for a possibility of multiple emission of up to 66 types of particles and LF (up to 28 Mg) at the preequilibrium stage of reactions. Then, we expand the coalescence model to allow coalescence of LF from nucleons emitted at the intranuclear cascade stage of reactions and from lighter clusters, up to fragments with mass numbers A ≤ 7, in the case of CEM, and A ≤ 12, in the case of LAQGSM. Next, we modify MCNP6 to allow calculating and outputting spectra of LF and heavier products with arbitrary mass and charge numbers. The improved version of CEM is implemented into MCNP6. Finally, we test the improved versions of CEM, LAQGSM, and MCNP6 on a variety of measured nuclear reactions. The modified codes give an improved description of energetic LF from particle-and nucleus-induced reactions; showing a good agreement with a variety of available experimental data. They have an improved predictive power compared to the previous versions and can be used as reliable tools in simulating applications involving such types of reactions.

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Section: Extending the Preequilibrium Modelmentioning

confidence: 99%

Production of energetic light fragments in extensions of the CEM and LAQGSM event generators of the Monte Carlo transport code MCNP6

et al. 2017

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“…In this research, the software MCNPX (Monte Carlo N-Particle eXtended) version 2.7.0 was used for Monte Carlo simulations [36] . This production code designed at the Los Alamos National Laboratory (LANL) can handle the transportation and interaction of photons, electrons, neutrons, protons and heavy ions for complex three-dimensional geometries in a wide range of energies.…”

Section: The Monte Carlo Simulationsmentioning

confidence: 99%

Monte Carlo calculations for reporting patient organ doses from interventional radiology

Huo

Feng

et al. 2017

EPJ Web Conf.

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“…A way to reduce this problem is to randomly discard files with a survival probability proportional to w k , similar to the Russian Roulette used in non-analogue Monte Carlo transport codes [15]. There are several ways to perform this in a correct way; here, a simple method ensuring that all surviving files obtain the same weight is used:…”

Section: B Russian Roulette (Rur)mentioning

confidence: 99%

“…• 56 Fe data in a computation of the dose rate from a 14 MeV neutron source shielded with iron-rich concrete modeled in mcnpx [15] as in Ref. [6].…”

Section: Studied Applicationsmentioning

confidence: 99%

Incorporating Experimental Information in the Total Monte Carlo Methodology Using File Weights

Helgesson

Sjöstrand

Koning

et al. 2015

Nuclear Data Sheets

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Some criticism has been directed towards the Total Monte Carlo method because experimental information has not been taken into account in a statistically well-founded manner. In this work, a Bayesian calibration method is implemented by assigning weights to the random nuclear data files and the method is illustratively applied to a few applications. In most of the considered cases, the estimated nuclear data uncertainty is reduced and the central values are significantly shifted. The study suggests that the method can be applied both to estimate uncertainties in a more justified way and in the search for better central values. Some improvements are however necessary; for example, the treatment of outliers and cross-experimental correlations should be more rigorous and random files that are intended to be prior files should be generated.

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MCNPX 2.7.0 extensions

Cited by 247 publications

References 0 publications

Production of energetic light fragments in extensions of the CEM and LAQGSM event generators of the Monte Carlo transport code MCNP6

Production of energetic light fragments in extensions of the CEM and LAQGSM event generators of the Monte Carlo transport code MCNP6

Monte Carlo calculations for reporting patient organ doses from interventional radiology

Incorporating Experimental Information in the Total Monte Carlo Methodology Using File Weights

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