Integral cross section of isomeric state formation in (neutron,nucleon) reactions using an Am-Be source

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
M TohamyM N H Comsan

Abstract

The present work targeted the study of the isomeric state formation in (n,n') and (n,p) reactions using the spectral emission of an 241Am-Be neutron source which favors the (neutron, nucleon) reactions over the (n, γ) and (n,2n) ones. The integral cross section of the isomeric nuclear states in the neutron-induced nucleon-emission reactions of fast neutrons on 115In, 199Hg, 58Ni, and 195Pt was measured experimentally. The monitor reaction of neutrons was the 115In(n,n')115mIn using the evaluated integral cross section of 269-15+13 mb, which was confirmed to have a constant isomeric ratio in the energy range between ∼1.6 MeV and ∼10 MeV. Integral cross sections for the 199Hg(n,n')199mHg, 58Ni(n,p)58mCo, 58Ni(n,p)58m+gCo and 195Pt(n,n')195mPt reactions were found to be 449 ± 13 mb, 112 ± 34 mb, 343 ± 72 mb and 740 ± 55 mb, respectively. Each experimental value was based on independent measurements of samples irradiated with a constant neutron flux from an 241Am-Be source (having standard emission probability). The experimental results are compared with the integrated cross sections from a new evaluation for neutron induced reactions weighted to standard neutron emission probability distribution. Integral values estimated from the...Continue Reading

Citations

Aug 9, 2021·Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine·A M RashadElsayed K Elmaghraby

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