Nuclear Reactions induced by the 14 MeV Neutrons

The nuclear reactions of Al, Fe, Cu, Zn, Mo and Ag produced by the neutrons from the T 3 ( d , n ) He 4 reaction have been investigated by means of the activation technique. The absolute numbers of activated nuclei in samples were determined by measuring the beta-rays from the samples with a 4π-proportional counter and applying the “ method of extrapolation.” By utilizing the variations of neutron energies in the laboratory system, an excitation curve of Mo 92 ( n , 2 n )Mo 91 reaction was obtained. For the cases of Al, Cl, Zn and Ag, only the gradients of excitation curves were also found. The experimental cross sections were determined as follows: 87.2 mb±8% for Al 27 ( n , p )Mg 27 , 120 mb±12% for Al 27 ( n , α)Na 24 , 144 mb±13% for Fe 56 ( n , p )Mn 56 , 556 mb±5% for Cu 63 ( u , 2 n )Cu 62 , 119 mb±12% for Zn 64 ( n , 2 n )Zn 63 , 60.2 mb±12% for Zn 66 ( n , p )Cu 66 , 132 mb±16% for Mo 92 ( n , 2 n )Mo 91 , 458 mb±11% for Ag 107 ( n , 2 n )Ag 106 , and 604 mb±11% for Ag 109 ( n , 2 n )Ag 108 . Com...

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