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Special Section Papers

Optimization of a Multiline Neutron Source Based on a 232Th Filter

[+] Author and Article Information
Y. Ben-Galim

NRC-Negev,
P.O. Box 9001,
Beer-Sheva 84190, Israel
e-mail: ybgx3@walla.com

R. Moreh

Physics Department,
Ben Gurion University of the Negev,
Beer-Sheva 84105, Israel
e-mail: moreh@bgu.ac.il

I. Orion

Department of Nuclear Engineering,
Ben Gurion University of the Negev, Beer-Sheva 84105, Israel
e-mail: iorion@bgu.ac.il

Manuscript received October 22, 2016; final manuscript received April 1, 2017; published online May 25, 2017. Assoc. Editor: Jean Koch.

ASME J of Nuclear Rad Sci 3(3), 030912 (May 25, 2017) (3 pages) Paper No: NERS-16-1145; doi: 10.1115/1.4036435 History: Received October 22, 2016; Revised April 01, 2017

A multiline neutron source can be produced by using a metallic 232Th filter in conjunction with a white neutron source. The multiline spectrum consists of ∼20 relatively strong intensity lines ranging from 10 to 4000 eV. It is shown that the width of each neutron line of the spectrum is strongly dependent on the absorber thickness. This neutron source is useful for accurate cross section measurements with precise neutron energies. The optimum thickness of the 232Th absorber, which was found to yield a sharp multiline spectrum throughout the above energy range, was found to be ∼14 cm.

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References

Figures

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Fig. 1

(a) Total cross section of the 69.24 eV resonance in 232Th, in the range E = 62–74 eV [8]. (b) Calculated shape of the filtered neutron line after passing through 14 cm of 232Th.

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Fig. 2

(Bottom panel): plot of the absorption cross section versus energy [8]. (Top panel): calculated neutron spectrum obtained after a white neutron beam passes through a 14 cm filter of 232Th in the range 10–4000 eV.

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Fig. 3

Time-of-flight neutron spectrum calculated by assuming an incident white neutron source and a 25.5 m flight path

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Fig. 4

Calculated FWHM versus 232Th thickness for two neutron lines at ∼67 eV and ∼673 eV

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