scholarly journals Transformations of actinides fission product yields due to post scission emission of nuclear particles:232Th

2021 ◽  
Author(s):  
V.T. Maslyuk ◽  
O.O. Parlag ◽  
M.I. Romanyuk ◽  
O.I. Lendyel ◽  
O.M. Pop
Keyword(s):  
Experimental Data ◽  
Fission Product ◽  
Fission Products ◽  
Product Yields ◽  
Fission Fragments ◽  
Charge Distributions ◽  
Fission Product Yields ◽  
Symmetric Fission ◽  
The Many ◽  
Theoretical Results

The "many ensembles" method was proposed to investigate the influence of nuclear particles' post-scission emission on mass and charge distributions of fission products. The post scission approximation had been used; each of these ensembles consists of the fission fragments after emission of chains of different lengths, both the beta (±β) particles and neutrons. The theory allows one to find the most probable two fragment clusters of fission products and study their evolution after the post-scission emission of nuclear particles. The isotope <sup>232</sup>Th was chosen as an example, the fission fragments of which are intensively studied in the experiment. It is shown that the post-scission emission of nuclear particles eventually leads to the convergence of the asymmetric peaks, which looks like enhanced symmetric fission mode over asymmetric one for fission product yields. A comparison of the theoretical results and experimental data for the <sup>232</sup>Th fission fragments indicates their satisfactory matching.

scholarly journals Using CGMF to estimate corrections for fission yields measured via γ-ray spectroscopy

2020 ◽  
Vol 242 ◽  
pp. 03003
Author(s):  
P. Jaffke ◽  
P. Talou ◽  
M. Devlin ◽  
N. Fotiades
Keyword(s):  
Fission Product ◽  
Nuclear Structure ◽  
Fission Products ◽  
Spin Distribution ◽  
Product Yields ◽  
Fission Fragments ◽  
Fission Product Yields ◽  
Γ Ray ◽  
The Impact ◽  
Fission Yields

Fission product yields have been inferred using γ-ray spectroscopy for several decades. Typically, these efforts have focused on even-Z even-A fission products as their nuclear structure are less complicated. To further simplify the situation, it is often assumed that no side-feeding to the ground-state occurs and multiplicity cuts have a negligible effect on the inferred yields. Using CGMF, a Hauser-Feshbach statistical decay model for the primary fission fragments, we estimate the impact of these assumptions and determine corrections for specific fission product yields. We report on these corrections and investigate their sensitivity to various nuclear parameters, specifically the spin distribution of the fission fragments and the assumed nuclear structure. Our results indicate that even in the simplest of cases, say the 2+ → 0+ transitions in even-Z even-A fragments, average level corrections are on the order of 75%.

scholarly journals Measurements of short-lived fission product yields using monoenergetic neutron and photon beams

2020 ◽  
Vol 242 ◽  
pp. 01004
Author(s):  
Sean Finch ◽  
Matthew Gooden ◽  
Chris Hagmann ◽  
Calvin Howell ◽  
Vanessa Linero ◽  
...  
Keyword(s):  
Fission Product ◽  
Fission Products ◽  
Product Yield ◽  
Transfer System ◽  
Photon Beams ◽  
Product Yields ◽  
Transit Times ◽  
Hpge Detectors ◽  
Fission Product Yields ◽  
Pu Isotopes

A joint TUNL-LLNL-LANL collaboration was formed to measure the absolute fission product yields from the 235 U, 238 U, and 239 Pu isotopes. Our goal is to study the energy evolution of fission products using monoenergetic beams. In order to extend our successful fission product-yield studies to include products with shorter half-lives, a RApid Belt-driven Irradiated Target Transfer System, named RABITTS, was constructed. This system allows us to perform cyclic activation and quantify fission products with γ-ray spectroscopy using HPGe detectors. Both a 1 meter and 10 meter transfer system have been developed, with transit times of 0.4 and 1.1 seconds, respectively. Using these systems, we have measured sub-second half-lives. Our goal is to measure fission product yields from neutron-induced fission with En = 0.5 − 14.8 MeV and photofission with Eγ = 8 − 15 MeV. A detailed characterization of the system’s performance is presented, including preliminary fission product measurements, and the expected sensitivity.

scholarly journals Toward short-lived and energy-dependent fission product yields from neutron-induced fission

2020 ◽  
Vol 239 ◽  
pp. 03001
Author(s):  
Anton P Tonchev ◽  
Jack A Silano ◽  
Chris Hagmann ◽  
Roger Henderson ◽  
Mark A Stoyer ◽  
...  
Keyword(s):  
Fission Product ◽  
Fission Products ◽  
Incident Neutron ◽  
Tandem Accelerator ◽  
Precision Data ◽  
Product Yields ◽  
Fission Product Yields ◽  
Induced Fission ◽  
Energy Dependent ◽  
Fission Yields

Fission product yields (FPYs) are an important source of information that are used for basic and applied physics. They are essential observables to address questions relevant to nucleosynthesis in the cosmos that created the elements from iron to uranium, for example, in energy generating processes from fission recycling in binary neutron star mergers; resolving the reactor neutrino anomaly; decay heat release in nuclear reactors; and many national security applications. While new applications will require accurate energy-dependent FPY data over a broad set of incident neutron energies, the current evaluated FPY data files contain only three energy points: thermal, fast, and 14-MeV incident energies. Recent measurements using mono-energetic and pulsed neutron beams at the Triangle Universities Nuclear Laboratory (TUNL) tandem accelerator and employing a dual fission ionization chambers setup have produced self-consistent, high-precision data critical for testing fission models for the neutron-induced fission of the major actinide nuclei. This paper will present new campaign just beginning utilizing a RApid Belt-driven Irradiated Target Transfer System (RABITTS) to measure shorter-lived fission products and the time dependence of fission yields, expanding the measurements from cumulative towards independent fission yields.

Independent fission-product yields and fast-neutron emission by fission products

1974 ◽  
Vol 17 (7) ◽  
pp. 905-910
Author(s):  
A. B. Koldobskii ◽  
V. M. Kolobashkin ◽  
A. A. Gusev
Keyword(s):  
Fission Product ◽  
Fast Neutron ◽  
Neutron Emission ◽  
Fission Products ◽  
Product Yields ◽  
Fission Product Yields

scholarly journals Revisiting the Analysis of the Isochronous Mass Measurements of Uranium Fission Fragments at the ESR

2020 ◽  
Vol 227 ◽  
pp. 02012
Author(s):  
R. S. Sidhu ◽  
R. J. Chen ◽  
Yu. A Litvinov ◽  
Y. H. Zhang ◽  
Keyword(s):  
Experimental Data ◽  
Data Analysis ◽  
State Of The Art ◽  
Fission Products ◽  
Mass Measurements ◽  
Fission Fragments ◽  
Uranium Fission

The re-analysis of experimental data on mass measurements of ura- nium fission products obtained at the ESR in 2002 is discussed. State-of-the-art data analysis procedures developed for such measurements are employed.

Fission product yields at intermediate energy

1998 ◽  
Author(s):  
V. A. Rubchenya ◽  
J. Äystö ◽  
P. Dendooven ◽  
S. Hankonen ◽  
A. Jokinen ◽  
...  
Keyword(s):  
Fission Product ◽  
Intermediate Energy ◽  
Product Yields ◽  
Fission Product Yields
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