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Formation and de-excitation of 111mCd using natural cadmium and Am–Be neutron source

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Abstract

The process of 111mCd formation and de-excitation was studied. The decay half-life of the metastable state at 0.396 MeV along with cross-sectional value for 111Cd(n,n′)111mCd reaction, employing the 241Am–Be as a fast neutron source, was measured. For fast neutron flux determination, the 115In(n,n′)115mIn reaction was used as a flux comparator over the entire energy range of the 241Am–Be neutrons. Special attention was paid to the determination of the mean neutron flux at the irradiation positions as well as to the measurement of induced activity. To weak activity’s detection, 70% efficiency HPGe detector with graded Z shielding was applied. For half-life determination, 14 sequential count measurements were taken for the 245.4 keV and 150.8 keV γ-lines, obtained as result of the metastable state de-excitation, yielding T1/2 = 48.56 ± 0.05 min. The 111Cd(n,n′)111mCd reaction cross section was calculated and found to be 253 ± 18 mb. The contribution effects of the competing reactions 110Cd(n,γ)111mCd and 112Cd(n,2n)111mCd were estimated using the 245.4 keV line (Iγ = 94%) to be 0.045% and 2.49%, respectively. The obtained results were compared against both measured and evaluated data available in the literature.

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Authors and Affiliations

  1. Experimental Nuclear Physics Department, Nuclear Research Centre, Atomic Energy Authority, Cairo, Egypt

    M. Tohamy & M. N. H. Comsan

  2. Physics Department, Faculty of Science, Al-Azhar University, Cairo, Egypt

    G. S. M. Ahmed

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  1. M. Tohamy
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  2. G. S. M. Ahmed
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  3. M. N. H. Comsan
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Correspondence to G. S. M. Ahmed.

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Tohamy, M., Ahmed, G.S.M. & Comsan, M.N.H. Formation and de-excitation of 111mCd using natural cadmium and Am–Be neutron source. Indian J Phys 95, 1491–1497 (2021). https://doi.org/10.1007/s12648-020-01823-2

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