MCNP6 fragmentation of light nuclei at intermediate energies

Mashnik, Stepan G.; Kerby, Leslie M.

doi:10.48550/arxiv.1404.7820

Cited by 3 publications

(8 citation statements)

References 36 publications

(147 reference statements)

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“…The general agreement/disagreement of the results with available measured data for oxygen is very similar to what was displayed in Ref. [33] for p + 14 N, 27 Al, or nat Si.…”

Section: Fermi Break-upsupporting

confidence: 89%

“…For many cases, a better description of the heavier fragments occurs for A Fermi = 16 or 14, and usually the LF are better described using A F ermi = 12. However, the model with any of these values agrees reasonably well with the measured data, especially for LF with Z ≤ 4 (e. g., [33]). For LF with Z > 4, it is difficult to determine which value agrees better with the data: A Fermi = 12 or A Fermi = 16.…”

Section: Fermi Break-upsupporting

confidence: 73%

“…It is important that available transport codes predict such reactions as well as possible. For this reason, efforts have been made recently to investigate the validity and performance of, and to improve where possible, nuclear reaction models used by such transport codes as GEANT4 (e.g., [30]), SHIELD-HIT (e.g., [31]), PHITS (e.g., [32]), as well as MCNP6 (e.g., [33,34]).…”

Section: Fermi Break-upmentioning

confidence: 99%

“…Many more examples are presented in Ref. [33], some of which address different reaction mechanisms for fragment production, with some involving more than one mechanism in the production of the same LF in a given reaction.…”

Section: Fermi Break-upmentioning

confidence: 99%

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Production of Energetic Light Fragments in CEM, LAQGSM, and MCNP6

Mashnik,

Kerby,

Gudima

et al. 2016

Preprint

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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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“…The general agreement/disagreement of the results with available measured data for oxygen is very similar to what was displayed in Ref. [33] for p + 14 N, 27 Al, or nat Si.…”

Section: Fermi Break-upsupporting

confidence: 89%

Section: Fermi Break-upsupporting

confidence: 73%

Section: Fermi Break-upmentioning

confidence: 99%

Section: Fermi Break-upmentioning

confidence: 99%

See 2 more Smart Citations

Production of Energetic Light Fragments in CEM, LAQGSM, and MCNP6

Mashnik,

Kerby,

Gudima

et al. 2016

Preprint

Self Cite

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“…Using these data, both models evaluate the probabilities of absorbing, generating, or recharging of nucleons, pions, and kaons with kinetic energies up to 1.2 GeV. In the low-energy region of (50 − 300) MeV, there are sufficient data for cascade modeling [171][172][173][174][175] but at higher energies, where the pion production probability becomes essential, the available data are rather fragmentary and thus the phenomenological cascadeexciton model CEM03 [176][177][178] is applied. The cascade is modeled on an iron nucleus and the re-scaling factor ∝ A 2/3 is used to determine the cross sections on nuclei different from iron.…”

Section: Final State Interaction Modelsmentioning

confidence: 99%

Running axial mass of the nucleon as a phenomenological tool for calculating QE neutrino-nucleus cross sections

Kakorin,

Kuzmin,

Naumov

2021

Preprint

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We suggest an empirical rule-of-thumb for calculating the cross sections of charged-current quasielastic (CCQE) and CCQE-like interactions of neutrinos and antineutrinos with nuclei. The approach is based on the standard relativistic Fermi-gas model and on the notion of neutrino energy dependent axial-vector mass of the nucleon, governed by a couple of adjustable parameters, one of which is the conventional charged-current axial-vector mass. The inelastic background contributions and final-state interactions are therewith simulated using GENIE 3 neutrino event generator. An extensive comparison of our calculations with earlier and current accelerator CCQE and CCQE-like data for different nuclear targets shows good or at least qualitative overall agreement over a wide energy range. We also discuss some problematical issues common to several competing contemporary models of the CCQE (anti)neutrinonucleus scattering and to the current neutrino interaction generators. KeywordsNeutrino • Nucleon form factors • Axial-vector mass • Charged currents • Likelihood analysis

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Total reaction cross sections in CEM and MCNP6 at intermediate energies

Kerby

Mashnik

2015

Nuclear Instruments and Methods in Physics Research Section B:

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Accurate total reaction cross section models are important to achieving reliable predictions from spallation and transport codes. The latest version of the Cascade Exciton Model (CEM) as incorporated in the code CEM03.03, and the Monte Carlo N-Particle transport code (MCNP6), both developed at Los Alamos National Laboratory (LANL), each use such cross sections. Having accurate total reaction cross section models in the intermediate energy region (∼50 MeV to ∼5 GeV) is very important for different applications, including analysis of space environments, use in medical physics, and accelerator design, to name just a few. The current inverse cross sections used in the preequilibrium and evaporation stages of CEM are based on the Dostrovsky et al. model, published in 1959. Better cross section models are available now. Implementing better cross section models in CEM and MCNP6 should yield improved predictions for particle spectra and total production cross sections, among other results. Our current results indicate this is, in fact, the case.

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MCNP6 fragmentation of light nuclei at intermediate energies

Cited by 3 publications

References 36 publications

Production of Energetic Light Fragments in CEM, LAQGSM, and MCNP6

Production of Energetic Light Fragments in CEM, LAQGSM, and MCNP6

Running axial mass of the nucleon as a phenomenological tool for calculating QE neutrino-nucleus cross sections

Total reaction cross sections in CEM and MCNP6 at intermediate energies

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