# Systematic study of the (n, 2n) reaction cross section for 121Sb and 123Sb isotopes

• The cross sections of the 121Sb$(n, 2n)$120Sbm and 123Sb$(n, 2n)$122Sb reactions were measured at 12.50, 15.79 and 18.87 MeV neutron energies relative to the standard 27Al$(n,\alpha )$24Na monitor reaction using neutron activation and offline γ-ray spectrometry. Irradiation of the samples was performed at the BARC-TIFR Pelletron Linac Facility, Mumbai, India. The quasi-monoenergetic neutrons were generated via the 7Li$(p,n)$ reaction. Statistical model calculations were performed by nuclear reaction codes TALYS (ver. 1.9) and EMPIRE (ver. 3.2.2) using various input parameters and nuclear level density models. The cross sections of the ground and the isomeric state as well as the isomeric cross section ratio were studied theoretically from reaction threshold to 26 MeV energies. The effect of pre-equilibrium emission is also discussed in detail using different theoretical models. The present measured cross sections were discussed and compared with the reported experimental data and evaluation data of the JEFF-3.3, ENDF/B-VIII.0, JENDL/AD-2017 and TENDL-2019 libraries. A detailed analysis of the uncertainties in the measured cross section data was performed using the covariance analysis method. Furthermore, a systematic study of the $(n, 2n)$ reaction cross section for 121Sb and 123Sb isotopes was also performed within 14–15 MeV neutron energies using various systematic formulae. This work helps to overcome discrepancies in Sb data and illustrate a better understanding of pre-equilibrium emission in the $(n, 2n)$ reaction channel.

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R. K. Singh, N. L. Singh, R. D. Chauhan, Mayur Mehta, S. V. Suryanarayana, Rajnikant Makwana, B. K. Nayak, H. Naik, Tarak Nath Nag and K. Katovsky. Systematic study of the (n, 2n) reaction cross section for 121Sb and 123Sb isotopes[J]. Chinese Physics C. doi: 10.1088/1674-1137/ac4a5a
R. K. Singh, N. L. Singh, R. D. Chauhan, Mayur Mehta, S. V. Suryanarayana, Rajnikant Makwana, B. K. Nayak, H. Naik, Tarak Nath Nag and K. Katovsky. Systematic study of the (n, 2n) reaction cross section for 121Sb and 123Sb isotopes[J]. Chinese Physics C.
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沈阳化工大学材料科学与工程学院 沈阳 110142

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## Systematic study of the (n, 2n) reaction cross section for 121Sb and 123Sb isotopes

###### Corresponding author: N. L. Singh, nl.singh-phy@msubaroda.ac.in
• 1. Department of Physics, Faculty of Science, the M. S. University of Baroda, Vadodara - 390002, INDIA
• 2. Department of Physics, Netaji Subhas University of Technology, Dwarka, New Delhi- 110078, INDIA
• 3. Institute for Plasma Research, Gandhinagar- 382428, INDIA
• 4. Nuclear Physics Division, Bhabha Atomic Research Centre, Mumbai, INDIA
• 5. Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai, INDIA
• 6. Department of Electrical Power Engineering, Brno University of Technology, Brno-61600, Czech Republic

Abstract: The cross sections of the 121Sb$(n, 2n)$120Sbm and 123Sb$(n, 2n)$122Sb reactions were measured at 12.50, 15.79 and 18.87 MeV neutron energies relative to the standard 27Al$(n,\alpha )$24Na monitor reaction using neutron activation and offline γ-ray spectrometry. Irradiation of the samples was performed at the BARC-TIFR Pelletron Linac Facility, Mumbai, India. The quasi-monoenergetic neutrons were generated via the 7Li$(p,n)$ reaction. Statistical model calculations were performed by nuclear reaction codes TALYS (ver. 1.9) and EMPIRE (ver. 3.2.2) using various input parameters and nuclear level density models. The cross sections of the ground and the isomeric state as well as the isomeric cross section ratio were studied theoretically from reaction threshold to 26 MeV energies. The effect of pre-equilibrium emission is also discussed in detail using different theoretical models. The present measured cross sections were discussed and compared with the reported experimental data and evaluation data of the JEFF-3.3, ENDF/B-VIII.0, JENDL/AD-2017 and TENDL-2019 libraries. A detailed analysis of the uncertainties in the measured cross section data was performed using the covariance analysis method. Furthermore, a systematic study of the $(n, 2n)$ reaction cross section for 121Sb and 123Sb isotopes was also performed within 14–15 MeV neutron energies using various systematic formulae. This work helps to overcome discrepancies in Sb data and illustrate a better understanding of pre-equilibrium emission in the $(n, 2n)$ reaction channel.

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