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Measurement and covariance analysis of 59Co(n, 2n)58Co reaction cross sections at the effective neutron energies of 11.98 and 15.75 MeV

Santhi Sheela Yerraguntla, Haladhara Naik, Manjunatha Karantha, Srinivasan Ganesan, Suryanarayana Venkata Saraswatula and Sreekumaran Narayana Pillai Nair
From the journal Radiochimica Acta

Abstract

The 59Co(n, 2n)58Co reaction cross sections relative to the cross sections of the 115In(n, n′)115mIn reaction have been measured at the effective neutron energies of 11.98 and 15.75 MeV by using activation and off-line γ-ray spectrometric technique. Neutron beam used in the present experiment was generated from the 7Li(p, n)7Be reaction with the proton energies of 14 and 18 MeV at the 14UD BARC-TIFR Pelletron facility, Mumbai. We also present the covariance information by taking into account the sources of error and the correlations between the attributes influencing the measurements. The 59Co(n, 2n)58Co reaction cross sections from the present work are then compared with the values from different evaluated nuclear data libraries. The micro-correlation technique suggested by Smith was modified to generate the covariance matrix for the measurements of reaction cross sections as the efficiencies of detector for the sample and monitor are correlated.

Acknowledgements

One of the authors, Santhi Sheela, thanks Department of Atomic Energy-Board of Research in Nuclear Sciences (DAE-BRNS), Mumbai for the financial support through a research project (Sanction No. 36(6)/14/52/2014-BRNS/2708). The authors would like to thank Tim Vidmar, Belgian Nuclear Research Centre (SCK⋅CEN), Belgium for providing EFFTRAN software for calculating the correction factor due to coincidence summing. The authors would also like to thank Vinay Madhusudanan, Asst. Prof. Department of Mathematics, MIT, Manipal for his association in developing a Matlab code for computing covariance matrix. The authors are thankful to Naohiko Otsuka, International Atomic Energy Agency for his valuable expert opinion on the method of retrieving monitor cross section from IRDFF. They are also grateful to the staff of Pelletron facility, TIFR for giving the proton beam during the irradiation.

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Received: 2018-02-06
Accepted: 2018-05-30
Published Online: 2018-07-14
Published in Print: 2018-11-27

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