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

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Abstract

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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Acknowledgements

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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Authors and Affiliations

  1. Department of Data Science, Manipal Academy of Higher Education, Manipal, 576104, India

    Meghna Karkera & Manjunatha Prasad Karantha

  2. Department of MACS, National Institute of Technology Karnataka, Surathkal, 575025, India

    Santhi Sheela Yerraguntla

  3. Department of Physics, MIT, Manipal, 576104, India

    Sripathi Punchithaya

  4. NIE, Mysuru, 570008, India

    Sripathi Punchithaya

  5. Nuclear Physics Division, Bhabha Atomic Research Centre, Mumbai, 400085, India

    Saraswatula Venkata Suryanarayana & Laxman Singh Dhanu

  6. CARAMS, Manipal Academy of Higher Education, Manipal, 576104, India

    Manjunatha Prasad Karantha

  7. Formerly in Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai, 400085, India

    Haladhara Naik

  8. Former Raja Ramanna Fellow of the DAE, Bhabha Atomic Research Centre, Mumbai, 400085, India

    Srinivasan Ganesan

  9. Reactor Physics Design Division, Bhabha Atomic Research Center, Mumbai, 400085, India

    Rajeev Kumar, Devesh Raj & Umasankari Kannan

  10. Safety Studies Section, Bhabha Atomic Research Centre, Mumbai, 400085, India

    Kapil Deo

  11. Technical Physics Division, Bhabha Atomic Research Centre, Mumbai, 400085, India

    Tarun Patel & Saroj Bishnoi

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  1. Meghna Karkera
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Correspondence to Haladhara Naik.

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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). https://doi.org/10.1007/s10967-019-06722-3

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