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Study of (n, 2n ) Reaction Cross Sections, Systematic and Pre-Equilibrium Effects

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Specific cross sections for (n, 2n ) reactions are required for many applications such as neutron dosimeter, design of next generation nuclear reactors, cancer therapy etc. to transmutation of nuclear waste. Experimental data for 130 isotopes for A = 19–232 have been collected, analyzed and compared. A semi empirical formula for (n, 2n) reaction cross-sections at ∼14.7 MeV as a function of N, Z, (N–Z)/A, Bn and E th has been proposed by using the multiple regression technique. The predicted values and the values calculated by EMPIRE (version2.18) are in close agreement with the experimental values for a large set of nuclides; however there are disagreements for some cases. We have investigated the pre-equilibrium effects in experimental (n, 2n) crosssection data. It has been observed that the pre-equilibrium processes harden the spectra of first neutron leading to less excitation energy of the compound nucleus, consequently the probability of emission of second neutron is reduced and CN cross-section for (n, 2n) reaction is diminished.
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Document Type: Research Article

Publication date: September 1, 2013

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  • Journal of Advanced Physics is an interdisciplinary peer-reviewed journal consolidating research activities in all experimental and theoretical aspects of advanced physics. The journal aims in publishing articles of novel and frontier physics that merit the attention and interest of the whole physics community. JAP publishes review articles, full research articles, short communications of important new scientific and technological findings in all latest research aspects of physics.
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