Measurements of cross sections for the 209Bi(n, 4n) reaction by using high energy neutrons with continuous energy spectra
1 Department of Energy Science, Sungkyunkwan University, Suwon, Korea
2 Department of Physics, Sungkyunkwan University, Suwon, Korea
3 Department of Physics, Soongsil University, Seoul, Korea
4 Department of Physics, S. P. Pune University, Pune, India
a e-mail: firstname.lastname@example.org
Published online: 13 September 2017
We measured 209Bi(n, 4n) cross sections at neutron energies En = 29.8 ± 1.8 MeV and En = 34.8 ± 1.8 MeV. Bismuth oxide samples were irradiated with the neutrons produced by impinging 30, 35 and 40 MeV proton beams on a 1.05 cm thick beryllium target, where the proton beams were from the MC-50 Cyclotron of Korea Institute of Radiological Medical Sciences (KIRAMS). The neutron flux for each proton beam energy Ep, ΦEp(En), has a broad spectrum with respect to En. By taking the difference in the neutron fluxes, the difference spectra, Φ40(En) −Φ35(En) and Φ35(En) −Φ30(En), are obatined and found to be peaked at En = 29.8 and 34.8 MeV, respectively, with a width of about 3.6 MeV. By making use of this observation and employing the TENDL-2009 library we could extract the 209Bi(n, 4n)206Bi cross sections at the aforementioned neutron energies.
© The Authors, published by EDP Sciences, 2017
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