scholarly journals A SURVEY AND EVALUATION OF THERMAL FISSION YIELDS FOR $sup 235$U, $sup 239$Pu, $sup 233$U, AND $sup 241$Pu.

1967 ◽  
Author(s):  
B.F. Rider ◽  
C.P. Ruiz ◽  
J.P. Jr. Peterson ◽  
F.R. Smith
Keyword(s):  
Survey And Evaluation ◽  
Fission Yields

SPIDER: A new tool for measuring fission yields

2014 ◽  
Author(s):  
Krista C. Meierbachtol
Keyword(s):  
Fission Yields

scholarly journals Separation of Lanthanide Isotopes from Mixed Fission Product Samples

Separations ◽  
2021 ◽  
Vol 8 (7) ◽  
pp. 104
Author(s):  
Leah M. Arrigo ◽  
Jun Jiang ◽  
Zachary S. Finch ◽  
James M. Bowen ◽  
Staci M. Herman ◽  
...  
Keyword(s):  
Fission Product ◽  
Fission Products ◽  
Nuclear Data ◽  
Product Analysis ◽  
Data Production ◽  
Thermal Irradiation ◽  
Nuclear Events ◽  
Lanthanide Separation ◽  
Enriched Uranium ◽  
Fission Yields

The measurement of radioactive fission products from nuclear events has important implications for nuclear data production, environmental monitoring, and nuclear forensics. In a previous paper, the authors reported the optimization of an intra-group lanthanide separation using LN extraction resin from Eichrom Technologies®, Inc. and a nitric acid gradient. In this work, the method was demonstrated for the separation and quantification of multiple short-lived fission product lanthanide isotopes from a fission product sample produced from the thermal irradiation of highly enriched uranium. The separations were performed in parallel in quadruplicate with reproducible results and high decontamination factors for 153Sm, 156Eu, and 161Tb. Based on the results obtained here, the fission yields for 144Ce, 153Sm, 156Eu, and 161Tb are consistent with published fission yields. This work demonstrates the effectiveness of the separations for the intended application of short-lived lanthanide fission product analysis requiring high decontamination factors.

scholarly journals From fission yield measurements to evaluation: status on statistical methodology for the covariance question

2018 ◽  
Vol 4 ◽  
pp. 26 ◽  
Author(s):  
Brieuc Voirin ◽  
Grégoire Kessedjian ◽  
Abdelaziz Chebboubi ◽  
Sylvain Julien-Laferrière ◽  
Olivier Serot
Keyword(s):  
Statistical Tests ◽  
Fission Products ◽  
Experimental Program ◽  
Mass Yield ◽  
Statistical Methodology ◽  
Fission Yield ◽  
Fission Process ◽  
Induced Fission ◽  
Entropy Criterion ◽  
Fission Yields

Studies on fission yields have a major impact on the characterization and the understanding of the fission process and are mandatory for reactor applications. Fission yield evaluation represents the synthesis of experimental and theoretical knowledge to perform the best estimation of mass, isotopic and isomeric yields. Today, the output of fission yield evaluation is available as a function of isotopic yields. Without the explicitness of evaluation covariance data, mass yield uncertainties are greater than those of isotopic yields. This is in contradiction with experimental knowledge where the abundance of mass yield measurements is dominant. These last years, different covariance matrices have been suggested but the experimental part of those are neglected. The collaboration between the LPSC Grenoble and the CEA Cadarache starts a new program in the field of the evaluation of fission products in addition to the current experimental program at Institut Laue-Langevin. The goal is to define a new methodology of evaluation based on statistical tests to define the different experimental sets in agreement, giving different solutions for different analysis choices. This study deals with the thermal neutron induced fission of 235U. The mix of data is non-unique and this topic will be discussed using the Shannon entropy criterion in the framework of the statistical methodology proposed.

Observers in analytic groups: A content analysis study from the participant perspective

2021 ◽  
pp. 053331642110076
Author(s):  
Christian Peter Endler ◽  
Angelika Enzian ◽  
Günter Dietrich ◽  
Stefan Schacht ◽  
Gabriele Sachs
Keyword(s):  
Content Analysis ◽  
Group Leader ◽  
Analysis Study ◽  
Survey And Evaluation ◽  
Literature Group ◽  
Almost All

What perceptions do group participants have about silent observers, what transferences are involved, what function can the listeners have for the group? In an anonymous survey and evaluation based on content analysis, almost all participants reported positive, and two thirds also negative impressions and perceptions. Observers were perceived as being familiar or supportive and as threatening or constraining to an approximately equal extent. There was no outright demonization or perception of a divide between the group leader(s) and the observers, as described in the older literature. Group participants also appear to perceive observers as representatives of their own superego, which are ‘silenced’.

scholarly journals Extensive Study of the Quality of Fission Yields from Experiment, Evaluation and GEF for Antineutrino Studies and Applications

2021 ◽  
Vol 173 ◽  
pp. 54-117
Author(s):  
K.-H. Schmidt ◽  
M. Estienne ◽  
M. Fallot ◽  
S. Cormon ◽  
A. Cucoanes ◽  
...  
Keyword(s):  
Extensive Study ◽  
Fission Yields

Cumulative yields of stable and long-lived isotopes of tin in neutron-induced fission

1983 ◽  
Vol 61 (11) ◽  
pp. 1490-1497 ◽  
Author(s):  
K. J. R. Rosman ◽  
J. R. De Laeter ◽  
J. W. Boldeman ◽  
H. G. Thode
Keyword(s):  
Stable Isotopes ◽  
Fine Structure ◽  
Fission Product ◽  
Mass Spectrometer ◽  
Smooth Curve ◽  
Mass Region ◽  
Neutron Fission ◽  
Source Mass ◽  
Induced Fission ◽  
Fission Yields

The relative cumulative fission yields of the six stable isotopes of tin (117Sn,118Sn, 119Sn, 120Sn, 122Sn, and 124Sn) and the long-lived isotope 126Sn have been measured in the thermal and epicadium neutron fission of 233U and 235U, and the epicadium neutron fission of 238U. Nanogram-sized fission product tin samples were extracted from irradiated uranium samples and analyzed in a solid source mass spectrometer. In each case a smooth curve can be drawn through the yield points of the seven isotopes of tin. There is, therefore, no evidence of "fine structure" in the 117 ≤ A ≤ 126 portion of the symmetric mass region.

A survey and evaluation of static flowshop scheduling heuristics

1984 ◽  
Vol 22 (1) ◽  
pp. 127-141 ◽  
Author(s):  
YANG BYUNG PARK ◽  
C. DENNIS PEGDEN ◽  
E. EMORY ENSCORE
Keyword(s):  
Flowshop Scheduling ◽  
Survey And Evaluation
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