On the search for a (n,f) cross-section reference at intermediate energies

Durán, I.; Ventura, A.; Meo, S. Lo; Tarrío, D.; Tassan‐Got, L.; Paradela, C.

doi:10.1051/epjconf/201714602032

Cited by 11 publications

(6 citation statements)

References 13 publications

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“…The basic references are the measurement performed by the Gatchina group in the energy range from 200 MeV to 1 GeV for the (p,f) reaction [74], and, for the (n,f) reaction, the absolute measurements below 200 MeV [43,44], as well as the n_TOF data up to 1 GeV [73], relative to the 235 U(n,f) reaction, whose cross section has been evaluated in Ref. [75] with the computer codes mentioned above.…”

Section: Intermediate Energy Fissionmentioning

confidence: 99%

The fission experimental programme at the CERN n_TOF facility: status and perspectives

et al. 2020

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Neutron-induced fission reactions play a crucial role in a variety of fields of fundamental and applied nuclear science. In basic nuclear physics they provide important information on properties of nuclear matter, while in nuclear technology they are at the basis of present and future reactor designs. Finally, there is a renewed interest in fission reactions in nuclear astrophysics due to the multi-messenger observation of neutron star mergers and the important role played by fission recycling in r -process nucleosynthesis. Although studied for several decades, many fundamental questions still remain on fission reactions, while modern applications and the development of more reliable nuclear models require high-accuracy and consistent experimental data on fission cross sections and other fission observables. To address these needs, an extensive fission research proa gramme has been carried out at the n_TOF neutron timeof-flight facility at CERN during the last 18 years, taking advantage of the high energy resolution, high luminosity and wide energy range of the neutron beam, as well as of the detection and data acquisition systems designed for this purpose. While long-lived isotopes are studied on the 185 m long flight-path, the recent construction of a second experimental area at a distance of about 19 m has opened the way to challenging measurements of short-lived actinides. This article provides an overview of the n_TOF experimental programme on neutron-induced fission reactions along with the main characteristics of the facility, the various detection systems and data analysis techniques used. The most important results on several major and minor actinides obtained so far and the future perspectives of fission measurements at n_TOF are presented and discussed.

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Section: Intermediate Energy Fissionmentioning

confidence: 99%

The fission experimental programme at the CERN n_TOF facility: status and perspectives

et al. 2020

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“…It is worth noting that for the energy interval of 100 MeV -1 GeV Monte Carlo simulations have been performed by S. Lo Meo et. al [7] and at the upper limit of 2 GeV, by I. Duran et al [8] both with the INCL++/ABLA07 model. Results seem to be in accordance with the experimental data from the n_TOF facility in the energy range of 100 MeV -1 GeV.…”

Section: Simulation With Incl++/abla07mentioning

confidence: 99%

“…With modest changes in the two fission parameters that are basic in the decay models: the height of the fission barrier of the fragments, ΔBf , increased by +0.1, and the asymptotic level density parameter, af, multiplied by a factor (k=1.007). With the adaptation of the adjustable parameters discussed in [8], the simulation implemented in this study is performed for the extended 100 MeV -10 GeV energy range.…”

Section: Simulation With Incl++/abla07mentioning

confidence: 99%

Study and detection of relativistic Solar Neutrons at ground level with the Spherical Proportional Counter

Kyratzis

Savvidis

2019

hnps

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A novel method of high energy solar neutron detection is proposed with the Spherical Proportional Counter (SPC), taking advantage of the 209Bi(n,f) reaction. This reaction, is considered as a standard for high energy neutron detection, due to large cross section values in the 100 MeV – 1 GeV energy interval, obtained in the n_TOF facility at CERN. A thin spherical shell of Bismuth will be situated in the large volume of the SPC, serving as target for high energy neutrons bombarding the detector, thus resulting in fission fragment emission. Detailed simulation of the 209Bi(n,f) reaction with the INCL++ model, coupled with the ABLA07 de–excitation code is performed (cross section, mass & atomic number distribution, kinetic energy per fragment) in the 100 MeV – 10 GeV energy interval, together with SRIM for the fragments’ projected range in 209Bi. Experimental data from a 252Cf source are obtained, in order to validate the SPC’s efficiency in fission fragment detection. Calculations for the expected reactions in the 209Bi shell have been performed in different atmospheric depths (700 & 1000 g/cm2), and various spherical detector radii.

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“…The de-excitation models are frequently used in the simulation of nuclear reactions and the results are usually compared in a wide range of incident energies [181,189,190,191,192,193].…”

Section: Abla07mentioning

confidence: 99%

Shannon information entropy in heavy-ion collisions

2018

Progress in Particle and Nuclear Physics

104

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The general idea of information entropy provided by C.E. Shannon "hangs over everything we do" and can be applied to a great variety of problems once the connection between a distribution and the quantities of interest is found. The Shannon information entropy essentially quantify the information of a quantity with its specific distribution, for which the information entropy based methods have been deeply developed in many scientific areas including physics. The dynamical properties of heavy-ion collisions (HICs) process make it difficult and complex to study the nuclear matter and its evolution, for which Shannon information entropy theory can provide new methods and observables to understand the physical phenomena both theoretically and experimentally. To better understand the processes of HICs, the main characteristics of typical models, including the quantum molecular dynamics models, thermodynamics models, and statistical models, etc, are briefly introduced. The typical applications of Shannon information theory in HICs are collected, which cover the chaotic behavior in branching process of hadron collisions, the liquid-gas phase transition in HICs, and the isobaric difference scaling phenomenon for intermediate mass fragments produced in HICs of neutron-rich systems. Even though the present applications in heavy-ion collision physics are still relatively simple, it would shed light on key questions we are seeking for. It is suggested to further develop the information entropy methods in nuclear reactions models, as well as to develop new analysis methods to study the properties of nuclear matters in HICs, especially the evolution of dynamics system.

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On the search for a (n,f) cross-section reference at intermediate energies

Cited by 11 publications

References 13 publications

The fission experimental programme at the CERN n_TOF facility: status and perspectives

The fission experimental programme at the CERN n_TOF facility: status and perspectives

Study and detection of relativistic Solar Neutrons at ground level with the Spherical Proportional Counter

Shannon information entropy in heavy-ion collisions

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