Мақола

Strong evidence for quasifission in asymmetric reactions forming<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Po</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>202</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>

R. RafieiDepartment of Nuclear Physics, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, ACT 0200, AustraliaR. G. ThomasDepartment of Nuclear Physics, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, ACT 0200, AustraliaD. J. HindeDepartment of Nuclear Physics, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, ACT 0200, AustraliaM. DasguptaDepartment of Nuclear Physics, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, ACT 0200, AustraliaC. R. MortonDepartment of Nuclear Physics, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, ACT 0200, AustraliaL. R. GasquesDepartment of Nuclear Physics, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, ACT 0200, AustraliaMichael D. BrownDepartment of Nuclear Physics, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, ACT 0200, AustraliaM. D. RodríguezDepartment of Nuclear Physics, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, ACT 0200, Australia

2008lv

ABI

Аннотация

Fission fragment mass-angle correlations and mass ratio distributions have been measured for the reactions $^{16}\mathrm{O}+^{186}\mathrm{Os}$, $^{24}\mathrm{Mg}+^{178}\mathrm{Hf}$, $^{34}\mathrm{S}+^{168}\mathrm{Er}$, and $^{48}\mathrm{Ti}+^{154}\mathrm{Sm}$, forming the $^{202}\mathrm{Po}$ composite nucleus, at near barrier energies. Systematic analysis based on the expected dependence of the variance of the mass distribution on the angular momentum and temperature of the compound nucleus indicate that the two lighter systems evolve through true compound nucleus fission. Evidence of quasifission was observed for the two most mass-symmetric reactions, through strong mass-angle correlations for the $^{48}\mathrm{Ti}+^{154}\mathrm{Sm}$ reaction and a broadened mass ratio distribution for the $^{34}\mathrm{S}+^{168}\mathrm{Er}$ reaction. Furthermore, the increase in mass width at near barrier energies shows the influence of the alignment of statically deformed target nuclei.

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Идентификаторлар

DOI: 10.1103/physrevc.77.024606

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