Abstract
We measured 209 Bi(n, 4n) cross sections at neutron energies E n = 29.8 ± 1.8 MeV and E n = 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 E p , Φ E p ( E n ), has a broad spectrum with respect to E n . By taking the difference in the neutron fluxes, the difference spectra, Φ 40 ( E n ) −Φ 35 ( E n ) and Φ 35 ( E n ) −Φ 30 ( E n ), are obatined and found to be peaked at E n = 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 209 Bi(n, 4n) 206 Bi cross sections at the aforementioned neutron energies.
Highlights
Accurate cross sections for 209Bi(n, xn) are needed for the development of Accelerator Driven Systems with PbBi coolants [1, 2], while the experimental data are scarce
The cross sections have been measured by the activation method in the tens of MeV region, by using the quasi mono-energetic neutrons obtained by the 7Li(p, n)7Be reaction [3,4,5,6,7]
We report on our measurements of the 209Bi(n, 4n)206Bi cross sections done by the activation method, where we have used the neurtons obtained by impinging 30, 35 and 40 MeV proton beams on a thick beryllium target
Summary
Accurate cross sections for 209Bi(n, xn) are needed for the development of Accelerator Driven Systems with PbBi coolants [1, 2], while the experimental data are scarce. The cross sections have been measured by the activation method in the tens of MeV region, by using the quasi mono-energetic neutrons obtained by the 7Li(p, n)7Be reaction [3,4,5,6,7]. We report on our measurements of the 209Bi(n, 4n)206Bi cross sections done by the activation method, where we have used the neurtons obtained by impinging 30, 35 and 40 MeV proton beams on a thick beryllium target. The neutron spectrum for each proton beam energy is not mono-energetic but broad with respect to the neutron energy En. But the difference of two spectra with adjacent proton energies is observed to have a peak structure with some width, which enables us to extract the cross sections at En = (29.8 ± 1.8) MeV and (34.8 ± 1.8) MeV.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
