Maqola

Fusion-fission and fusion-evaporation processes in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow/><mml:mrow><mml:mn>20</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">Ne</mml:mi><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:mi mathvariant="normal">Tb</mml:mi></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow/><mml:mrow><mml:mn>20</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">Ne</mml:mi><mml:mrow><mml:msup><mml:mrow><mml:mo>+</mml:mo></mml:mrow><mml:mrow><mml:mn>169</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">Tm</mml:mi></mml:math>interactions between<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>E</mml:mi><mml:mo>/</mml:mo><mml:mi>A</mml:mi><mml:mo>=</mml:mo><mml:mn>8</mml:mn><mml:mn/></mml:math>and 16 MeV

J. CabreraFNRS and Institute of Nuclear Physics, Université catholique de Louvain, B-1348 Louvain-la-Neuve, BelgiumTh. KeutgenFNRS and Institute of Nuclear Physics, Université catholique de Louvain, B-1348 Louvain-la-Neuve, BelgiumY. El MasriFNRS and Institute of Nuclear Physics, Université catholique de Louvain, B-1348 Louvain-la-Neuve, BelgiumCh. DufauquezFNRS and Institute of Nuclear Physics, Université catholique de Louvain, B-1348 Louvain-la-Neuve, BelgiumV. RoberfroidFNRS and Institute of Nuclear Physics, Université catholique de Louvain, B-1348 Louvain-la-Neuve, BelgiumI. TilquinFNRS and Institute of Nuclear Physics, Université catholique de Louvain, B-1348 Louvain-la-Neuve, BelgiumJ. Van MolFNRS and Institute of Nuclear Physics, Université catholique de Louvain, B-1348 Louvain-la-Neuve, BelgiumR. RégimbartFNRS and Institute of Nuclear Physics, Université catholique de Louvain, B-1348 Louvain-la-Neuve, BelgiumR. J. CharityFNRS and Institute of Nuclear Physics, Université catholique de Louvain, B-1348 Louvain-la-Neuve, BelgiumJ. B. NatowitzFNRS and Institute of Nuclear Physics, Université catholique de Louvain, B-1348 Louvain-la-Neuve, BelgiumK. HagelFNRS and Institute of Nuclear Physics, Université catholique de Louvain, B-1348 Louvain-la-Neuve, BelgiumR. WadaFNRS and Institute of Nuclear Physics, Université catholique de Louvain, B-1348 Louvain-la-Neuve, BelgiumD. J. HindeFNRS and Institute of Nuclear Physics, Université catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium

2003lv

ABI

Annotatsiya

Fission lifetime studies are performed using the ``neutron-clock'' technique associated with statistical and dynamical model calculations. In this framework we have undertaken, at the Louvain-la-Neuve cyclotron facility, the study of ${}^{20}\mathrm{Ne}{+}^{159}\mathrm{Tb}$ and ${}^{20}\mathrm{Ne}{+}^{169}\mathrm{Tm}$ induced fission reactions between $E/A=8$ and 16 MeV. In this work we have determined (a) fusion-evaporation and fusion-fission cross sections; (b) the prescission and postscission multiplicities of evaporated light particle (neutron, proton, and alpha) and their energy and angular distributions, and (c) the total energy balance of fission process after taking into account preequilibrium or incomplete-fusion processes. The comparison of the experimental data, multiplicities, and cross sections, with the statistical-model calculations incorporating simple aspects of the dynamics have enabled us to determine the ranges of fission lifetimes and the contribution of fast fission at different compound-nucleus excitation energies.

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DOI: 10.1103/physrevc.68.034613

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