Fission Fragment Yield, Cross Section and Prompt Neutron and Gamma Emission Data from Actinide Isotopes

Hambsch, F.-J.; Oberstedt, S.; Al-Adili, Ali; Bryś, T.; Billnert, R.; Matei, C.; Salvador-Castiñeira, P.; Tudora, Anabella; Vidali, M.

doi:10.1016/j.nds.2014.08.012

Cited by 9 publications

(4 citation statements)

References 10 publications

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“…In Figure 4, we show our data, as well as comparisons to other 237 Np (n,f) reaction data and the GEF model. The overall trend of decreasing TKE with increasing excitation is consistent with other fast neutron TKE studies of actinides [17][18][19][20][21][22][23][24][25][26]. While the TKE release for the lowest energy neutrons is approximately linear, a first order log 10 (En) polynomial fit is needed to describe the fast neutron energy region (En> 1 MeV).…”

Section: A Tke Vs Ensupporting

confidence: 86%

Total kinetic energy release in the fast neutron-induced fission of 237Np

Pica,

Chemey,

Yao

et al. 2020

Preprint

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The total kinetic energy (TKE) in the fast neutron induced fission of 237 Np was measured for neutron energies from n = 2.6 -100 MeV at the LANSCE-WNR facility. The post TKE release decreases non-linearly with increasing incident neutron energy and can be represented as T KE(M eV ) = (174.38 ± 0.72) − (5.11 ± 0.5821) log 10 En for En > 1 MeV. Analysis of the fragment mass distributions indicates that the decrease in TKE with increasing En is a consequence of two factors; shell effects fade out at high excitation energies, resulting in the increasing occurrence of symmetric fission, and TKEasym decreases rapidly at high En.

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Section: A Tke Vs Ensupporting

confidence: 86%

Total kinetic energy release in the fast neutron-induced fission of 237Np

Pica,

Chemey,

Yao

et al. 2020

Preprint

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“…Experiments and evaluation 1 are often driven by the interest in the reliable nuclear data required for technical applications, mostly in reactor technology. In this context, we mention for example (i) the measurements of promptneutron spectra at the LANSCE accelerator facility at the Neutron Science Center in Los Alamos, New Mexico, USA [198], (ii) fission-fragment yield, cross-section, promptneutron and gamma-emission data from actinide isotopes at the Joint Research Centre in Geel (previously called IRMM), Belgium [199], (iii) a coordinated research project (CRP) on the evaluation of the prompt-fission-neutron spectra of actinides, organized by the IAEA, Vienna, Austria [200], (iv) measurements of the energy dependence of fissionproduct yields from 235,238 U and 239 Pu at TUML, Durham, North Carolina, USA [201], (v) MCNP studies on multiple scattering contributions, over-corrected backgrounds, and inconsistent deconvolution methods used in the evaluated prompt-fission-neutron spectra of 239 Pu(n,f) [202], (vi) the high-precision measurement of the prompt-neutron spectrum of 252 Cf at the Rensselaer Polytechnic Institute, Troy, New York, USA [203], (vii) a measurement of the energy and multiplicity distributions of neutrons from the photofission of 235 U, again at Los Alamos Neutron Science Center [204], and (viii) measurements of the beta decay of fission products with the modular total-absorption spectrometer at the Holifield Radioactive Ion Beam Facility, Oak Ridge, Tennessee, USA [205,206]. We would also like to mention that there has been a European initiative in the last few years to measure the neutron-induced fission cross section of 242 Pu, using very different experimental methods in order to provide several completely independent measurements of this cross section.…”

Section: Introductionmentioning

confidence: 99%

Review on the progress in nuclear fission—experimental methods and theoretical descriptions

2018

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An overview is given on some of the main advances in the experimental methods, experimental results, theoretical models and ideas of the last few years in the field of nuclear fission. New approaches have considerably extended the availability of fissioning systems for the experimental study of nuclear fission, and have provided a full identification of all fission products in A and Z for the first time. In particular, the transition from symmetric to asymmetric fission around Th, some unexpected structures in the mass distributions in the fission of systems around Z = 80-84, and an extended systematics of the odd-even effect in the fission fragment Z distributions have all been measured (Andreyev et al 2018 Rep. Prog. Phys. 81 016301). Three classes of model descriptions of fission presently appear to be the most promising or the most successful. Self-consistent quantum-mechanical models fully consider the quantum-mechanical features of the fission process. Intense efforts are presently being made to develop suitable theoretical tools (Schunck and Robledo 2016 Rep. Prog. Phys. 79 116301) for modeling the non-equilibrium, large-amplitude collective motion leading to fission. Stochastic models provide a fully developed technical framework. The main features of the fission-fragment mass distribution have been well reproduced from mercury to fermium and beyond (Möller and Randrup 2015 Phys. Rev. C 91 044316). However, limited computer resources still impose restrictions, for example, on the number of collective coordinates and on an elaborate description of the fission dynamics. In an alternative semi-empirical approach (Schmidt et al 2016 Nucl. Data Sheets 131 107), considerable progress in describing the fission observables has been achieved by combining several theoretical ideas, which are essentially well known. This approach exploits (i) the topological properties of a continuous function in multidimensional space, (ii) the separability of the influence of fragment shells and the macroscopic properties of the compound nucleus, (iii) the properties of a quantum oscillator coupled to a heat bath of other nuclear degrees of freedom, (iv) an early freeze-out of collective motion, and (v) the application of statistical mechanics for describing the thermalization of intrinsic excitations in the nascent fragments. This new approach reveals a high degree of regularity and allows the calculation of high-quality data that is relevant to nuclear technology without specifically adjusting the empirical data of individual systems.

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“…We have chosen the neutron-rich 252 Cf isotope for our investigations which represents an asymmetric type of fission. This nucleus has been extensively studied experimentally and many important observables such as mass, TKE distribution and average prompt neutrons multiplicities are measured [38][39][40][41][42] and available for comparisons with theoretical predictions. The fission barrier of 252 Cf, calculated within the HFB model with Gogny forces D1S, is equal to B f =9.71 MeV.…”

Section: Methodsmentioning

confidence: 99%

Fission dynamics of $^{252}$Cf

Zdeb,

Dobrowolski,

Warda

2017

Preprint

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The time-dependent generator coordinate method with the gaussian overlap approximation (TDGCM+GOA) formalism is applied to describe the fission of 252 Cf. We perform analysis of fission from the initial states laying in the energetic range from the ground state to the state located 4 MeV above the fission barrier. The fission fragment mass distributions, obtained for different parity, energy of levels and types of mixed states, are calculated and compared with experimental data. The impact of the total time of wave packet propagation on the final results is studied as well. The weak dependence of obtained mass yields on the initial conditions is shown.

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Fission Fragment Yield, Cross Section and Prompt Neutron and Gamma Emission Data from Actinide Isotopes

Cited by 9 publications

References 10 publications

Total kinetic energy release in the fast neutron-induced fission of 237Np

Total kinetic energy release in the fast neutron-induced fission of 237Np

Review on the progress in nuclear fission—experimental methods and theoretical descriptions

Fission dynamics of $^{252}$Cf

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