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Prompt emission of \(\gamma \)-rays and neutrons from the fast neutron induced fission of \(^{232}\)Th at neutron energies near and above the fission threshold

  • Regular Article – Experimental Physics
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Abstract

Measurements of prompt fission \(\gamma \)-rays and neutrons emitted in the fast neutron induced fission of \(^{232}\)Th have been carried out at incident neutron energies of 1.5 MeV, 2.1 MeV and 2.8 MeV. The \(\gamma \)-rays were recorded using two \(\hbox {CeBr}_{{3}}\) scintillation detectors in coincidence with a twin section fission trigger ionisation chamber while the neutrons were detected using two EJ301 liquid scintillation detectors. The energy spectra of \(\gamma \)-rays were obtained after unfolding the detected pulse height spectrum using the response matrix of the \(\hbox {CeBr}_{{3}}\) detectors. The extracted prompt fission \(\gamma \)-ray spectra for \(^{232}\)Th(n,f) when compared with the existing data of \(^{252}\)Cf(sf),\(^{239}\)Pu(n,f) and \(^{238}\)U(n,f), showed noticeably lower intensity of photons at energies less than 0.7 MeV. No significant excitation energy dependence of the spectral characteristics of prompt fission \(\gamma \)-ray spectra for \(^{232}\)Th(n,f) has been observed. The time-of-flight spectra measured using EJ301 detectors with respect to the twin section fission trigger chamber were used to determine the prompt fission neutron energy spectra at all the three incident neutron energies mentioned above. The measured spectra were then fitted using Maxwell and Watt parametrizations to derive the average prompt fission neutron energy. It is found that GEF describes neutron data well, but fails to corroborate with gamma data.

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Data availability statement

This manuscript has no associated data or the data will not be deposited. [Authors’ comment: The authors can be contacted for the data presented in this article.]

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Acknowledgements

The authors thank the FOTIA staff for their support and the smooth operation of accelerator during the experiment and Mr. Rohan Turbhekar, Target Lab, TIFR, for providing the Lithium foils for the experiment. They are thankful to Dr. A.K. Gupta for his constant encouragement and support of this programme. They would also like to thank Dr. R.K. Choudhury and Dr. A. Saxena for fruitful discussions.

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Authors and Affiliations

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

    Sukanya De, R. G. Thomas, G. Mishra, A. Mitra & Ajay Kumar

  2. Homi Bhabha National Institute, Anushaktinagar, Mumbai, 400094, India

    Sukanya De & R. G. Thomas

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  1. Sukanya De
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Correspondence to R. G. Thomas.

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Communicated by R. Janssens.

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De, S., Thomas, R.G., Mishra, G. et al. Prompt emission of \(\gamma \)-rays and neutrons from the fast neutron induced fission of \(^{232}\)Th at neutron energies near and above the fission threshold. Eur. Phys. J. A 58, 217 (2022). https://doi.org/10.1140/epja/s10050-022-00877-6

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