Measurement of the neutron fluence on the spallation source at Dubna
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J. Adam
Abstract
A 232Th activation sample was exposed directly to the spallation neutrons produced by 1GeV proton colliding with a lead target and other samples of 197Au, 209Bi, 59Co, 115In and 181Ta were irradiated by moderated neutrons after passing through 6 cm of paraffin. Different (n, γ) and (n, xn) reaction products in 232Th, 197Au and 209Bi samples are analyzed by gamma-ray spectrometry to measure the neutron fluence at the positions of the samples. For this purpose a histogram of ‘flat’ spectrum averaged neutron cross-sections in over thirty given energy groups was determined from the PREPRO-2000 software. Results of measurements are compared with Monte-Carlo simulations by the Dubna CASCADE code. Experimental values for both spallation and moderated neutron fluences are in reasonable agreement with the CASCADE code. Thus, the experimentally measured fluence of moderated neutrons was used to infer the ‘one group’ reaction cross-sections of 209Bi (n, xn) reactions for x = 6 to 9.
Kurzfassung
Eine Probe von Th-232 wurde direkt mit Spallationsneutronen aus der Reaktion von 1 GeV Protonen mit Blei bestrahlt. Weiterhin wurden Proben von Au-197, Bi-209, Co-59, In-115 und Ta-181 mit abgebremsten Spallationsneutronen bestrahlt, die durch 6 cm Paraffin moderiert wurden. Die Ausbeuten von verschiedenen Reaktionsprodukten aus (n, γ)- und (n, xn)-Reaktionen an Th, Au und Bi wurden mit Hilfe der Gamma-Spektrometrie bestimmt, um daraus den mittleren Neutronenfluss an den Probenpositionen zu berechnen. Dazu wurde eine gemittelte, ”flache“ Anregungsfunktion mit Hilfe der PREPRO-2000 Software mit gemittelten Wirkungsquerschnitten in über dreißig Energie-Intervallen berechnet. Die experimentellen Flüsse von schnellen und moderierten Neutronen stimmen passabel mit den Ergebnissen vom Monte-Carlo Code CASCADE überein. Mit Hilfe des experimentellen Spektrums moderierter Neutronen wurden mittlere Querschnitte für die Reaktionen Bi-209(n, xn)Bi-210-x mit 6 ≤ x ≤ 9 berechnet.
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© 2005, Carl Hanser Verlag, München
Articles in the same Issue
- Contents/Inhalt
- Contents
- Summaries/Kurzfassungen
- Summaries/Kurzfassungen
- Editorial
- 70 Volumes Kerntechnik
- Technical Contributions/Fachbeiträge
- Uncertainty and sensitivity analysis of void and power reactivity coefficients in an RBMK-1500 reactor core
- Theoretical studies on thermal stratification in a side heated cavity
- Measurement of the neutron fluence on the spallation source at Dubna
- Neutron reflection and leakage models for one-dimensional reactor computations
- Reactivity worth of the control rods at the ET-RR-2 reactor core
- Neutronic conceptual design of the ETRR-2 cold neutron source
- Criticality analyses of regions containing uranium in the earth history
- Semi-statistical mechanical fuel rod design
- Brennstabauslegung und Brennstabmodellierung – Teil 2
- The chemical separation of Eka-Hg from CERN W targets in view of recent relativistic calculations
- Letter to the Editor
- Comments on the question of the discovery of element 112 as early as 1971
Articles in the same Issue
- Contents/Inhalt
- Contents
- Summaries/Kurzfassungen
- Summaries/Kurzfassungen
- Editorial
- 70 Volumes Kerntechnik
- Technical Contributions/Fachbeiträge
- Uncertainty and sensitivity analysis of void and power reactivity coefficients in an RBMK-1500 reactor core
- Theoretical studies on thermal stratification in a side heated cavity
- Measurement of the neutron fluence on the spallation source at Dubna
- Neutron reflection and leakage models for one-dimensional reactor computations
- Reactivity worth of the control rods at the ET-RR-2 reactor core
- Neutronic conceptual design of the ETRR-2 cold neutron source
- Criticality analyses of regions containing uranium in the earth history
- Semi-statistical mechanical fuel rod design
- Brennstabauslegung und Brennstabmodellierung – Teil 2
- The chemical separation of Eka-Hg from CERN W targets in view of recent relativistic calculations
- Letter to the Editor
- Comments on the question of the discovery of element 112 as early as 1971
