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Total kinetic energy and mass yields from the fast neutron-induced fission of \(^{239}\hbox {Pu}\)

  • Regular Article – Experimental Physics
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Abstract

The total kinetic energy (TKE) release in fission is an important observable, constituting over 80% of the energy released in fission (\(\hbox {E}_{f} \approx 200~\hbox {MeV}\)). While the TKE release in the \(^{239}\hbox {Pu}\)(n,f) reaction was previously measured up to 50 MeV incident neutron energy (\(\hbox {E}_{n}\)), there were features in TKE release at the highest values of \(\hbox {E}_{n}\) that were puzzling. There was a marked flattening of TKE release from \(\hbox {E}_{n} = 30\) to 50 MeV, in disagreement with the clearly decreasing TKE observed from \(\hbox {E}_{n} = 0.5\) to 30 MeV. To verify and clarify this trend, TKE measurements at higher values of \(\hbox {E}_n\) were made. We present absolute measurements of TKE release in \(^{239}\hbox {Pu}\)(n,f) from \(\hbox {E}_{n} = 2.4\) to 100 MeV. We used silicon PIN detectors to measure the fragment energies and deduce mass-yield curves using the 2E-method. We also discuss fission asymmetry and the relationships between approximate fission fragment mass and distortion.

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Statement of data availability

The datasets and analysis programs employed are available from the corresponding author on reasonable request. Supplementary material can be found online at the journal website.

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Acknowledgements

We are grateful for the support of the facility operators at LANSCE and the OSTR for providing stable sources of neutrons. We are similarly grateful for the work of R. Yanez who designed the container used for shipping targets, C. Prokop for assisting with target handling at LANSCE prior to the experiment, and N. Fotiades for many fruitful conversations. This material is based upon work supported in part by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under award number DE-FG-06-97ER41026 (OSU) and under contract 89233218CNA000001 (LANL). University collaborators acknowledge support from this work from the DOE-NNSA Stewardship Science Academic Alliances Program under Grant No. DE-NA0003907. This research benefited from the use of the LANSCE accelerator facility. Nuclides used in this research were supplied by the United States Department of Energy Office of Science by the Isotope Program in the Office of Nuclear Physics.

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Authors and Affiliations

  1. Department of Chemistry, Oregon State University, Corvallis, OR, USA

    Alexander Chemey, Ashley Pica, Liangyu Yao & Walter Loveland

  2. P-27, Physics Division, Los Alamos National Lab, Los Alamos, NM, USA

    Hye Young Lee & S. A. Kuvin

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  1. Alexander Chemey
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Contributions

The experiment was designed and proposed and overseen by WL. Experimental data were collected by AC, AP, LY, and WL with critical assistance from HYL and SAK. AC and WL performed the primary data analysis. All authors contributed to the manuscript preparation, and have read and approved the final manuscript.

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Correspondence to Walter Loveland.

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Communicated by Robert Janssens

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Chemey, A., Pica, A., Yao, L. et al. Total kinetic energy and mass yields from the fast neutron-induced fission of \(^{239}\hbox {Pu}\). Eur. Phys. J. A 56, 297 (2020). https://doi.org/10.1140/epja/s10050-020-00295-6

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