Measurement of 115 In(n,2n) 114m In and 197 Au(n,2n) 196 Au reaction cross sections at the neutron energies of 13.52 and
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Measurement of 115In(n,2n)114mIn and 197Au(n,2n)196Au reaction cross sections at the neutron energies of 13.52 and 14.54 MeV with covariance analysis A. M. Sunitha1 · Kamsali Nagaraja1 · H. B. Sachhidananda2 · S. V. Suryanarayana3 · B. Rudraswamy1 · Haladhara Naik4 · Meghna Karkera3 · Imran Pasha1 · Y. S. Sheela5 · Manjunatha Prasad5 Received: 21 May 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract The 115In(n,2n)114mIn and 197Au(n,2n)196Au reaction cross sections have been measured relative to the 27Al(n,α)24Na monitor reaction at the two different incident neutron energies of 13.520 ± 0.005 MeV and 14.54 ± 0.24 MeV. The neutrons from the D-T fusion reaction at the Purnima neutron generator were used for activation followed by off-line γ-ray spectrometry. The uncertainty propagation and correlation of measured reaction cross sections were estimated using covariance analysis through considering the partial uncertainties in different attributes. The measured reaction cross sections from the present work have been compared with the literature data from EXFOR compilation, ENDF data of various libraries and theoretically calculated values from the TALYS-1.9 code. Keywords 115In(n,2n)114mIn and 197Au(n,2n)196Au reaction cross sections · Activation and off-line γ-ray spectrometry · Covariance analysis · TALYS-1.9 code
Introduction The neutron induced nuclear reaction cross sections are essential inputs in nuclear engineering applications especially in fission and fusion reactors, medical and industrial applications, personnel dosimetry in addition to fundamental research in nuclear physics and astrophysics [1, 2]. The reaction cross section data are also essential to validate the nuclear reaction theory models and for developing evaluated data libraries for which precision measurements of data are * Haladhara Naik [email protected] 1
Department of Physics, Bangalore University, Bengaluru, Karnataka 560056, India
2
Visvesvaraya Technological University, Belgaum, Karnataka 590018, India
3
Nuclear Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
4
Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India
5
Department of Data Science, Manipal Academy of Higher Education, Manipal, Karnataka 576104, India
required. Neutron induced reactions on Au and In, especially the (n,2n) reactions are proposed as a standard for high energy neutron dosimetry [3] and are also important as reference monitor reaction. Indium is very useful as a monitor for the estimation of neutron flux because the cross sections of (n,n)׀, (n,2n) reactions of the 113In and 115In isotopes have significant values from threshold to the neutron energy of 25 MeV. Similarly, the 197Au(n,2n) reaction is used as reaction monitor from threshold to high neutron energy. Moreover, the presence of a high-spin (12−) isomeric (m2) state in the residual nucleus of the 197Au(n,2n) reaction, makes it a sensitive test-case for several nuclear reaction model codes [4, 5]. The nuclear data are obtained thr
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