Study of Strongly Damped Collisions in the Reaction of 600-MeVKr84on aBi

Abstract

Detailed information on a new reaction mechanism is presented for a 600-MeV 84 Kr bombardment of 209 Bi. This reaction process represents a major fraction of the totalreaction cross section and is characterized by strong damping of energy degrees of freedom, but on the average, a relatively small amount of mass exchange compared to fis-

Skyrme-force time-dependent Hartree-Fock calculations with axial symmetry

“…In the 600 MeV Kr+ Bi system, the assumption that the average light fragment mass is 84 at all angles ignores the drift toward mass symmetry at back angles and hence results in a spurious decline of the back-angle ridge, which is known from coincidence measurements to be at a nearly constant kinetic energy. 46 In the Kr +La systems, the mass distribution for the most strongly damped events shows two components, one centered around the projectile mass and one around symmetry. 68 This indicates the presence of a fusion-fission component, not included in TDHF, which would tend to shift the experimental mass-integrated kinetic energy to lower values.…”

Experimental Evidence and Physical Implications of the Time Evolution Along the Mass Asymmetry Mode in Heavy Ion Reactions

“…The earlier measurements of angular distributions for quasi-fission reactions were gross angular distributions, which included all the products at once [3,4,. These angular distributions are side peaked, the peak appearing in the neighborhood of the grazing angle.…”

“…6 The f i r s t r e a c t i o n s studied w i t h p r o j e c t i l e s heavier than Ar on heavy t a r g e t s [3,4, immediately showed a mass d i s t r i b u t i o n centered about t h e t a r g e t and the p r o j e c t i l e . The group who discovered t h e phenomenon: l a b e l e d i t q u a s i -f i s s i o n , i n view o f the f a c t t h a t t h e k i n e t i c energies associated w i t h the products were n e a r l y thermal i z e d o r f i s s i o n -l i k e (Fig.…”

A theoretical approach to the problem of partial equilibration in heavy ion reactions

“…J -7-the cj>z are equal to zero with the exception of <1> 18 which is unity. While we have not investigated this feature in detail as yet, it may possibly contain an explanation for the angular distributions observed for the reactions induced by Kr [8,9] and Cu [10] ions on heavy ta~gets.…”