Determination of (n, 2n) Reaction Isomeric Cross Section for 87Rb, 112Cd, 138Bz, and 186W Using 14 MeV Neutrons

Authors

Hsiao-Chueh Kao

Publication Date

8-1973

Advisor(s) - Committee Chair

D.L. Humphrey, George Moore, U.F. Six

Degree Program

Department of Physics and Astronomy

Degree Type

Master of Science

Abstract

The purpose of this investigation was to measure the cross section for each of the reactions 87_{Rb(n, 2n)} 86m_Rb, 112_{Cd(n, 2n)}111m_Cd, 138_{Ba(n, 2n)} 137m_Ba and 186_{W(n, 2n)} 185m_W at 14.7 ± 0.03 MeV incident neutron energy. The incident neutron flux was determined during each irradiation from the activity produced in copper or aluminum disks between which the isotopically enriched sample was sandwiched. The 63_{Cu(n, 2n)}62_Cu and 27_{Al(n, p)}27_Mg reaction cross sections were assumed to be 593 ± 45 mb and 73 ± 5 mb respectively.

The activity of the sample and monitors was determined by using a 7.6 cm x 7.6 cm NaI(Tl) scintillation spectrometer calibrated with NBS standard sources or by employing the coincidence method in the case of the copper monitors.

The measured cross sections in this experiment were 87_{Rb(n, 2n)}86m_Rb (450 ±51 mb), 112_{CD(n, 2n)}111m_Cd (400 ± 45 mb), 138_{Ba(n, 2n)} 137m_Ba (769 ± 87 mb), and 186_{W(n, 2n)}185m_W (602 ± 74 mb).

Disciplines

Astrophysics and Astronomy | Physics

Recommended Citation

Kao, Hsiao-Chueh, "Determination of (n, 2n) Reaction Isomeric Cross Section for 87Rb, 112Cd, 138Bz, and 186W Using 14 MeV Neutrons" (1973). Masters Theses & Specialist Projects. Paper 1733.
https://digitalcommons.wku.edu/theses/1733