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

  • Meghna Karkera
  • Santhi Sheela Yerraguntla
  • Sripathi Punchithaya
  • Saraswatula Venkata Suryanarayana
  • Manjunatha Prasad Karantha
  • Haladhara NaikEmail author
  • Srinivasan Ganesan
  • Laxman Singh Dhanu
  • Rajeev Kumar
  • Kapil Deo
  • Devesh Raj
  • Tarun Patel
  • Saroj Bishnoi
  • Umasankari Kannan


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.


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



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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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  • Meghna Karkera
    • 1
  • Santhi Sheela Yerraguntla
    • 2
  • Sripathi Punchithaya
    • 3
    • 4
  • Saraswatula Venkata Suryanarayana
    • 5
  • Manjunatha Prasad Karantha
    • 1
    • 6
  • Haladhara Naik
    • 7
    Email author
  • Srinivasan Ganesan
    • 8
  • Laxman Singh Dhanu
    • 5
  • Rajeev Kumar
    • 9
  • Kapil Deo
    • 10
  • Devesh Raj
    • 9
  • Tarun Patel
    • 11
  • Saroj Bishnoi
    • 11
  • Umasankari Kannan
    • 9
  1. 1.Department of Data ScienceManipal Academy of Higher EducationManipalIndia
  2. 2.Department of MACSNational Institute of Technology KarnatakaSurathkalIndia
  3. 3.Department of PhysicsMITManipalIndia
  4. 4.NIEMysuruIndia
  5. 5.Nuclear Physics DivisionBhabha Atomic Research CentreMumbaiIndia
  6. 6.CARAMSManipal Academy of Higher EducationManipalIndia
  7. 7.Formerly in Radiochemistry DivisionBhabha Atomic Research CentreMumbaiIndia
  8. 8.Former Raja Ramanna Fellow of the DAEBhabha Atomic Research CentreMumbaiIndia
  9. 9.Reactor Physics Design DivisionBhabha Atomic Research CenterMumbaiIndia
  10. 10.Safety Studies SectionBhabha Atomic Research CentreMumbaiIndia
  11. 11.Technical Physics DivisionBhabha Atomic Research CentreMumbaiIndia

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