Measurement and covariance analysis of 140 Ce(n,2n) 139 Ce and 142 Ce(n,2n) 141 Ce reactions with the neutron energy of
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Measurement and covariance analysis of 140Ce(n,2n)139Ce and 142Ce(n,2n)141Ce reactions with the neutron energy of 13.5 MeV H. B. Sachhidananda1 · S. R. Manohara1 · A. M. Sunitha2 · Imran Pasha2 · B. Rudraswamy2 · S. V. Suryanarayana3 · Haladhara Naik4 · Meghna Karkera5 · Y. S. Sheela5 · Manjunatha Prasad5 Received: 24 February 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract The (n,2n) reaction cross sections of cerium isotopes have been experimentally measured at the neutron energy of 13.50 ± 0.15 MeV by using the method of activation and off-line γ-ray spectroscopy. The neutron energy was obtained from the D-T reaction using the Purnima Neutron Generator at BARC. The natCe sample was irradiated along with the gold and indium monitor foils. The cross sections of 140Ce(n,2n)139Ce and 142Ce(n,2n)141Ce reactions were measured by using both the gold and indium as a monitor and then collapsed to get the best values of reactions cross sections. The uncertainties in the measured cross sections of 140Ce(n,2n)139Ce and 142Ce(n,2n)141Ce reactions were determined using covariance analysis by considering uncertainties in various attributes. The measured values from the present work were compared with the literature data based on EXFOR compilation, evaluated data from different libraries and theoretically calculated values from TALYS-1.95 and EMPIRE-3.2. Keywords 140Ce(n,2n)139Ce and 142Ce(n,2n)141Ce reactions · Cross section · Activation method · Off-line γ-ray spectroscopy · 3H(d,n)4He reaction neutron · Co-variance analysis · TALYS-1.95 · EMPIRE-3.2
Introduction The high energy neutron induced reaction cross sections data of cerium isotopes are of important for testing nuclear models, reactor physics, radiation safety, nuclear science, material damage studies and in industrial application [1]. Among various material, the neutron induced reaction cross sections of 140Ce and 142Ce have practical applications in fusion reactor technology (FRT), calculations of nuclear heating, * S. R. Manohara [email protected] 1
Department of Physics, Siddaganga Institute of Technology (Affiliated to Visvesvaraya Technological University, Belgaum), Tumakuru, Karnataka 572103, India
2
Department of Physics, Bangalore University, Bengaluru, Karnataka 560056, India
3
Nuclear Physics Division, Bhabha Atomic Research Center, Mumbai 4000853, India
4
Radio Chemistry Division, Bhabha Atomic Research Center, Mumbai 4000853, India
5
Department of Data Science, Manipal Academy of Higher Education, Manipal, Karnataka 5761044, India
activation of reactor components, effect of radiation damage and to find formation of gases in structural materials [2]. Cerium is the most abundant rare earth metal which has four stable isotopes with isotopic composition of 136Ce (0.185%), 138Ce (0.251%), 140Ce (88.45%), and 142Ce (11.114%), respectively. The beta active cerium isotopes such as 144Ce, 143Ce, 141Ce and 139Ce are relatively longlived having the half-lives of 284.91 d, 33.039 h, 32.511 d and 137.641 d, respectively [3]. Among
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