Rearrangement Nuclear Reactions and Optical Model

Improved Cascade-Exciton Model of Nuclear Reactions

Recent improvements to the Cascade-Exciton Model (CEM) of nuclear reactions are briefly described. They concern mainly the cascade stage of reactions and a better description of nuclei during the preequilibrium and evaporation stages of reactions. The development of the CEM concerning fission is given in a separate talk at this conference. The increased accuracy and predictive power of the CEM ...

Nuclear reactions and nuclear ̄ssion

1 Cross sections and reaction rates 2 Consider a thin target of thickness dx and number density of targets nt being bombarded by a beam of number density Nb moving at velocity v. Each target nucleus presents a target area 3⁄4 { if one of the bombarding particles passes within the area 3⁄4, interaction (scattering, for example) occurs, otherwise not. Now if the beam covers an area A, the fractio...

Nuclear Structure and Nuclear Reactions

Atomic nuclei are the essence of the visible universe. Formed in the big bang or in cataclysmic astrophysical explosions, atomic nuclei are a crucial and intriguing part of the world. The basic features of atomic nuclei were understood in terms of the nuclear shell model in the 1963 Nobel Prize winning research of Eugene Paul Wigner, Maria Goeppert-Mayer, and J. Hans de Jensen. Since then, exte...

Nuclear Reactions

Rearrangement Reactions of 1,1-Divinyl-2-phenylcyclopropanes

1,1-Divinyl-2-phenylcyclopropanes are entry points to a rich area of rearrangement chemistry. With N,N-diallyl amide substrates, tandem radical cyclizations can be initiated at room temperature. Warming provides products of pure thermal rearrangements with acids, ester, and amides. These isomerizations give vinylcyclopentenes resulting from divinylcyclopropane rearrangements and more deeply rea...