Measurement and covariance analysis of \( ^{232} {\text{Th}}\left( {{\text{n}},2{\text{n}}} \right)^{231} {\text{Th}} \) reaction cross section


The \( ^{232} {\text{Th}}\left( {{\text{n}},2{\text{n}}} \right)^{231} {\text{Th}} \) reaction cross sections were measured at the neutron energies of 10.49 ± 0.29, 14.46 ± 0.26, 18.36 ± 0.24 MeV and 15.03 ± 0.003 MeV. For the first three energies, \( ^{7} {\text{Li}}\left( {{\text{p}},{\text{n}}} \right) \) reaction as a neutron source at the BARC-TIFR Pelletron accelerator facility was used. For the latter energy, \( ^{3} {\text{H}}\left( {{\text{d}},{\text{n}}} \right) \) neutron source using the PURNIMA neutron generator facility was used. The experiments were carried out using the activation method and off-line \( \upgamma \)-ray spectrometric technique. Covariance information of various attributes of cross section was propagated to obtain the covariance matrix for the reaction cross sections. The experimental resuts obtained with reference to the two different neutron sources are then compared with the values of evaluated nuclear data files such as ENDF/B-VIII.0, JENDL 4.0, JEFF-3.2, ROSFOND-2010, TENDL-2017 and the theoretical values from TALYS-1.9 code.

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The research work was supported by DAE-BRNS project (Sanction No. 36(6)/14/52/2014-BRNS/2708). The authors would like to thank the staff of BARC-TIFR Pelletron facility and PURNIMA neutron generator facility for their kind co-operation in providing the proton beam to carry out the experiment. One of the authors, Meghna Karkera gratefully acknowledges the Department of Atomic Energy of India for the award of Senior Research Fellowship to carry out the study. Meghna Karkera would also like to thank Dr. Mahesha, MIT, Manipal and colleague Savita for their timely guidance.

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Karkera, M., Yerraguntla, S.S., Punchithaya, S. et al. Measurement and covariance analysis of \( ^{232} {\text{Th}}\left( {{\text{n}},2{\text{n}}} \right)^{231} {\text{Th}} \) reaction cross section. J Radioanal Nucl Chem 322, 817–825 (2019).

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  • \( ^{232} {\text{Th}}\left( {{\text{n}},2{\text{n}}} \right)^{231} {\text{Th}} \) reaction cross section
  • Activation and off-line \( \upgamma \)-ray spectrometric technique
  • Covariance analysis