Mass distribution in 36.2 MeV alpha induced fission of \(^{232}\hbox {Th}\)


Mass distribution of fission products has been determined in \(\upalpha +^{\mathrm {232}}\hbox {Th}\) reaction at \(E_{\mathrm {lab}}=36.2\) MeV using \(\upalpha \) particles from the cyclotron at the Variable Energy Cyclotron Centre (VECC), Kolkata. Yields of 64 fission products having half-lives in the range of about \(\sim 1\) min to several days have been measured using gamma ray spectrometry. The mass distribution shows a clear triple humped structure indicating the contribution from both asymmetric and symmetric modes of fission. The experimental mass distribution was well reproduced by the calculation from the GEF code, which takes into account the multi-chance fission.

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Data Availability Statement

This manuscript has no associated data or the data will not be deposited. [Authors’ comment: All the relevant data including the representative gamma-ray spectra supporting the findings of the present study are given in the paper. Additional data such as gamma-ray spectra or other details can be provided by the corresponding author on request.]


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The authors would like to thank Shri P. S. Chakraborty and operations team of K130 Cyclotron at VECC for their contribution in beam-delivery for the experiments.

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Correspondence to D. Banerjee.

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Communicated by Jose Benlliure.

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Banerjee, D., Nag, T.N., Tripathi, R. et al. Mass distribution in 36.2 MeV alpha induced fission of \(^{232}\hbox {Th}\). Eur. Phys. J. A 56, 201 (2020).

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