Prescission and postscission charged particle emissions from the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">F</mml:mi></mml:mrow><mml:mprescripts/><mml:mrow/><mml:mrow><mml:mn>19</mml:mn></mml:mrow><mml:mrow/><mml:mrow/></mml:mmultiscripts></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mo>+</mml:mo></mml:mrow><mml:mrow><mml:mn>159</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>Tb reaction

Prescission and postscission multiplicities of protons and \ensuremath{\alpha} particles are measured in the $^{19}\mathrm{F}$${+}^{159}$Tb reaction. The observed prescission multiplicities are enhanced compared to statistical model predictions and the presaddle delay time of around 0.5\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}20}$ sec is needed to reproduce both prescission proton and \ensuremath{\alpha} particle multiplicities. This value is too small to account for the prescission neutron data measured by Newton et al., suggesting a long saddle-to-scission time. The measured postscission multiplicities of protons and \ensuremath{\alpha} particles indicate that fission fragments are rather colder than the statistical model predictions, but slightly hotter than the estimation from the obseved prescission and postscission neutron multiplicities.

Hali tarjima qilinmagan