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Measurement and Covariance Analysis of Reaction Cross Sections for 58Ni(n,p)58Co Relative to Cross Section for Formation of Zr-97 Fission Product in Neutron-Induced Fission of Th-232 and U-238 at Effective Neutron Energies En = 5.89, 10.11, and 15.87 MeV

B. S. Shivashankar, S. Ganesan, H. Naik, S. V. Suryanarayana, N. Sreekumaran Nair, K. Manjunatha Prasad

Nuclear Science and Engineering / Volume 179 / Number 4 / April 2015 / Pages 423-433

Technical Paper /

First Online Publication:January 26, 2015
Updated:March 30, 2015

The 58Ni(n,p)58Co reaction cross sections have been measured relative to two monitors: the cross sections for the formation of the 97Zr fission product in neutron-induced fission of (a) 232Th and of (b) 238U. It is demonstrated how to generate and combine covariance matrices (using partial uncertainties and microcorrelations) in relative measurements at various stages like efficiency calibration of the high-purity germanium detector, using the ratio of 58Ni(n,p)58Co reaction cross section relative to monitor cross section, and in the process of normalization. We further illustrate the weighted averaging of equivalent data as applicable in relative measurements. We provide the necessary data and the corresponding table of partial uncertainties as required for compilation in the EXchange-FORmat (EXFOR) database. This helps, in principle, anyone to generate and verify the steps in the calculation of the covariance matrices in the present work. We believe that it is important for all nuclear experimental scientists to incorporate a detailed data reduction procedure, reduced data, and partial uncertainties in their publications, to the extent possible, which will be very useful in EXFOR compilation.

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