Maqola

Mechanisms for light charged particle emission in the reactions 247 and 337 MeV<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Ar</mml:mi></mml:mrow><mml:mprescripts/><mml:mrow/><mml:mrow><mml:mn>40</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:mi mathvariant="normal">nat</mml:mi></mml:mrow></mml:msup></mml:mrow></mml:math>Ag

R. LaceyDepartment of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794N. N. AjitanandDepartment of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794J. AlexanderDepartment of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794D. M. de Castro RizzoDepartment of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794G. F. PeasleeDepartment of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794Louis C. VazDepartment of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794M. KaplanDepartment of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794M. KildirDepartment of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794G. La RanaDepartment of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794David J. MosesDepartment of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794W. ParkerDepartment of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794D. LoganDepartment of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794Michael S. ZismanDepartment of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794P. DeYoungDepartment of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794L. KowalskiDepartment of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794

1988lv

ABI

Annotatsiya

Light charged particles from the reactions 247 and 337 MeV $^{40}\mathrm{Ar}$${+}^{\mathrm{nat}}$Ag have been measured in singles and in coincidence with fission-like products. Most of the $^{1}\mathrm{H}$ and $^{4}\mathrm{He}$ in coincidence with fusion-fission and quasifission can be accounted for by evaporation from the composite nucleus or by the fragments. Multiplicities are determined for $^{1}\mathrm{H}$ and $^{4}\mathrm{He}$ in association with evaporation residues, fusion-fission, and quasifission. The probability for composite nucleus emission decreases with increasing spin zone of the emitter and gives a view of the role of emitter lifetime. The ratio of composite-nucleus multiplicities for quasifission/fusion-fission is about 1/2 ((1/4) for 337 MeV $^{40}\mathrm{Ar}$ (247 MeV $^{40}\mathrm{Ar}$) which implies a similar ratio for the lifetimes of the respective composite nuclei between thermalization and scission. Energy spectra and angular distributions of particles (in coincidence with fusion-fission and quasifission) are consistent with emission from a strongly distorted nuclear system en route toward scission. Prethermalization emission of $^{4}\mathrm{He}$ is observed at 10\ifmmode^\circ\else\textdegree\fi{} in comparable amounts for peripheral collisions (quasifission and fusion-fission) and for central collisions.

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DOI: 10.1103/physrevc.37.2540

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