Neutron science facility for neutron time-of-flight and fission cross-section measurements at RAON

2015 ◽  
Vol 66 (3) ◽  
pp. 478-485 ◽  
Author(s):  
Jae Cheon Kim ◽  
Gi Dong Kim ◽  
Jae Bum Son ◽  
Cheol Woo Lee ◽  
Young-Ouk Lee
Keyword(s):  
Cross Section ◽  
Time Of Flight ◽  
Fission Cross Section ◽  
Neutron Time

Fast-neutron-induced fission cross section of Pu242 measured at the neutron time-of-flight facility nELBE

2019 ◽  
Vol 99 (2) ◽  
Author(s):  
T. Kögler ◽  
A. R. Junghans ◽  
R. Beyer ◽  
M. Dietz ◽  
Ch. E. Düllmann ◽  
...  
Keyword(s):  
Fast Neutron ◽  
Cross Section ◽  
Time Of Flight ◽  
Fission Cross Section ◽  
Neutron Time ◽  
Induced Fission

scholarly journals Preparation and characterization of 10B targets at JRC-Geel

2020 ◽  
Vol 229 ◽  
pp. 03005
Author(s):  
David Vanleeuw ◽  
Jan Heyse ◽  
Goedele Sibbens ◽  
Mariavittoria Zampella
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Time Of Flight ◽  
Fission Cross Section ◽  
Nuclear Data ◽  
Areal Density ◽  
Reaction Cross ◽  
Neutron Time

Measurements of neutron-induced cross sections to generate nuclear data are a core activity of the JRC-Directorate G Standards for Nuclear Safety, Security and Safeguards unit in Geel. Thin 10B layers are of great importance in this activity as they are used to measure the absolute neutron flux in the beam using the standard 10B(n,α)7Li reaction cross-section as a reference. After a period of reduced activity and in line with a renewed interest for nuclear data, the demand for high quality 10B targets increased. In this paper we describe the design and features of a new e-beam evaporator specifically customized for the preparation of boron targets as replacement of the old dysfunctional equipment. Several 10B targets of varying thicknesses were prepared and characterized as part of the factory acceptance tests and implementation in the JRC-Geel target preparation laboratory. Differential substitution weighing was applied for mass determination and in order to calibrate the thickness monitor. Comparative time-of-flight measurements relative to 10B and 235U standard targets were conducted at the GELINA neutron time-of-flight facility at the JRC-Geel site as second methodology for the determination of 10B areal density. The morphology of the layers was assessed by means of Scanning Electron Microscopy (SEM). The determination of impurities was realized by means of Energy Dispersive X-ray (EDX). Finally, two boron targets were prepared in the frame of the measurement of the neutron induced fission cross-section of 230Th at the n_TOF neutron time-of-flight facility at CERN.

scholarly journals Neutron-induced fission cross section ofU234andNp237measured at the CERN Neutron Time-of-Flight (n_TOF) facility

2010 ◽  
Vol 82 (3) ◽  
Author(s):  
C. Paradela ◽  
L. Tassan-Got ◽  
L. Audouin ◽  
B. Berthier ◽  
I. Duran ◽  
...  
Keyword(s):  
Cross Section ◽  
Time Of Flight ◽  
Fission Cross Section ◽  
Neutron Time ◽  
Induced Fission

scholarly journals Determination of the fast-neutron-induced fission cross-section of 242Pu at nELBE

2018 ◽  
Vol 169 ◽  
pp. 00009
Author(s):  
Toni Kögler ◽  
Roland Beyer ◽  
Arnd R. Junghans ◽  
Ronald Schwengner ◽  
Andreas Wagner
Keyword(s):  
Fast Neutron ◽  
Cross Section ◽  
Neutron Transport ◽  
Fission Cross Section ◽  
Data Sets ◽  
Fission Rate ◽  
Relative Cross Section ◽  
Neutron Time ◽  
Induced Fission

The fast-neutron-induced fission cross section of 242Pu was determined in the energy range of 0.5 MeV to 10MeV at the neutron time-of-flight facility nELBE. Using a parallel-plate fission ionization chamber this quantity was measured relative to 235U(n,f). The number of target nuclei was thereby calculated by means of measuring the spontaneous fission rate of 242Pu. An MCNP 6 neutron transport simulation was used to correct the relative cross section for neutron scattering. The determined results are in good agreement with current experimental and evaluated data sets.

scholarly journals MicroMegas-based detectors for time-of-flight measurements of neutron-induced reactions

2020 ◽  
Vol 239 ◽  
pp. 17007
Author(s):  
F. Gunsing ◽  
F. Belloni ◽  
E. Berthoumieux ◽  
M. Diakaki ◽  
E. Dupont ◽  
...  
Keyword(s):  
Cross Section ◽  
Reaction Cross Section ◽  
Time Of Flight ◽  
Reaction Cross ◽  
Drift Region ◽  
Particle Detection ◽  
Radiation Resistant ◽  
Neutron Time ◽  
Low Mass ◽  
Flight Measurements

MicroMegas detectors are versatile gaseous detectors which are used for ionizing particle detection. A MicroMegas detector consists of two adjacent gas-filled volumes. One volume acts as a drift region with an electric field operating in the ionization chamber regime, the second volume is the amplification region acting as a parallel-plate avalanche counter. The use of the microbulk technique allows the production of thin, radiation resistant, and low-mass detector with a highly variable gain. Such MicroMegas detectors have been developed and used in combination with neutron time-of-flight measurements for in-beam neutron-flux monitoring, fission and light-charged particle reaction cross section measurements, and for neutron-beam imaging. An overview of MicroMegas detectors for neutron detection and neutron reaction cross section measurements and related results and developments will be presented.

scholarly journals Neutron-induced fission cross section of245Cm: New results from data taken at the time-of-flight facility n_TOF

2012 ◽  
Vol 85 (3) ◽  
Author(s):  
M. Calviani ◽  
M. H. Meaze ◽  
N. Colonna ◽  
J. Praena ◽  
U. Abbondanno ◽  
...  
Keyword(s):  
Cross Section ◽  
Time Of Flight ◽  
Fission Cross Section ◽  
Induced Fission

scholarly journals The Neutron Time-of-Flight Cross Section Program at the University of Kentucky - Adventures in Analysis II

2015 ◽  
Vol 93 ◽  
pp. 02014
Author(s):  
J.R. Vanhoy ◽  
S.F. Hicks ◽  
B.C. Combs ◽  
B.P. Crider ◽  
A.J. French ◽  
...  
Keyword(s):  
Cross Section ◽  
Time Of Flight ◽  
University Of Kentucky ◽  
Neutron Time ◽  
The University

scholarly journals Measurement of the 16O(n, α)13C cross-section using a Double Frisch Grid Ionization Chamber

2020 ◽  
Vol 239 ◽  
pp. 01030
Author(s):  
Sebastian Urlass ◽  
Roland Beyer ◽  
Sebastian Hammer ◽  
Andreas Hartmann ◽  
Arnd R. Junghans ◽  
...  
Keyword(s):  
Cross Section ◽  
Ionization Chamber ◽  
Time Of Flight ◽  
Charge Collection ◽  
Neutron Time ◽  
Induced Charge ◽  
Oxygen Atoms

The 16O(n, α)13C reaction was proposed to be measured at the neutron time-of-flight (n_TOF) facility of CERN. To this purpose, a Double Frisch Grid Ionization Chamber (DFGIC) containing the oxygen atoms as a component in the counting gas coupled with a switch device in order to prevent the charge collection from the so-called γ-flash has been developed at Helmholtz-Zentrum Dresden-Rossendorf (HZDR), in Germany. The first 16O(n, α)13C measurement without seeing the charge of the γ-flash at n_TOF has been performed in November 2018. After the electronics did not suffer from the y-flash any more, another huge charge collection was discovered. Due to the high instantaneous flux at the n_TOF facility [1] the amount of that induced charge from neutron induced background reactions was piling up so much that the recognition of 16O(n, α)13C reactions from that background was very difficult. For that reason another 16O(n, α)13C measurement at the time-of-flight facility nELBE at HZDR which has a low instantaneous flux [2], has been performed in April 2019. Both measurements from n_TOF and nELBE will be presented here.

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