Multiple Reaction Correction to 15 MeV Neutron Capture Cross Section in 115In

The cross section of the 115In(n,?)116m In reaction at an incident neutron energy of 15 MeV has been determined by measuring the ?-rays following the decay of the metastable (T1/2=54 min) first excited state of 116In. By systematically varying the geometrical arrangement the corrections due to secondary low-energy neutrons could be determined. Numerical estimates of the multiple reaction corrections have been made and a comparison with the experimental results indicates a good agreement. The corrected activation capture cross section at 15 MeV is 0.7?0.3 mb which is an order of magnitude lower than previous activation measurements on the same reaction.

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