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.

裂变中释放的总动能（TKE）是一个重要的观测值，占裂变释放的能量的80％以上（\（\ hbox {E} _ {f} \约200〜\ hbox {MeV} \））。尽管先前已经测量了\（^ {239} \ hbox {Pu} \）（n，f）反应中的TKE释放，但入射中子能量高达50 MeV（\（\ hbox {E} _ {n} \）） ，TKE版本中的某些功能令人费解，最高的\（\ hbox {E} _ {n} \）。TKE释放从\（\ hbox {E} _ {n} = 30 \）到50 MeV明显变平，这与从\（\ hbox {E} _ {n} = 0.5观察到的TKE明显下降明显不同\）到30 MeV。为了验证和澄清这种趋势，在较高的\（\ hbox {E} _n \）已完成。我们在\（^ {239} \ hbox {Pu} \）（n，f）中从\（\ hbox {E} _ {n} = 2.4 \）到100 MeV给出TKE释放的绝对测量值。我们使用硅PIN检测器来测量碎片能量，并使用2E方法推导质量-产率曲线。我们还将讨论裂变不对称性以及近似裂变碎片质量与畸变之间的关系。