Target fragmentation ofAu197by relativistic heavy ions

Abstract

The cross sections and recoil properties of a number of target fragmentation products formed by the reactions of 4.8and 25-GeV "C and 7.6-GeV "Ne with '"Au have been measured. Comparisons between these data for relativistic heavy ions and those for relativistic protons have been used to test the hypotheses of factorization and limiting fragmentation. The cross sections for most of the nuclides measured are related for different projectiles by the ratio of the total reaction cross sections. An exception is the light nuclides {A & 30), for which enhanced yields are found for heavy-ion projectiles compared to protons. The velocities imparted to recoil fragments by the projectiles are considerably larger for the heavy ions of -0.4 A GeV than for protons, but are the same for 2.1 A GeV "C {25-GeV kinetic energy) and 28-GeV protons. Limiting fragmentation has not been reached at energies of 0.4 A GeV, as shown by the large change in recoil properties with increasing energy. The projectile kinetic energy appears to be more significant as a scaling variable than the velocity for relativistic heavy ions.NUCLEAR REACTIONS '9~Au(2C, X), (~N e, X), X= Na-9 Au, Ei& =4. 8 and 25 GeV, E20 = 7.6 GeV; measured cross sections and recoil properties; deduced mean kinetic parameters; test of factorization and limiting fragmentation.

Mass-yield distribution in proton and heavy ion induced target fragmentation processes

“…(D) For a given target, the mass-yield distributions in the intermediate mass region (as well as the charge dispersion curves) does not change much, if for approximately the same total kinetic incident energies p, ~He, ~zC, 2~ or 4~ are used as projectile [4,9,15,17].…”

Yields and recoil properties of products from the reaction between natural copper and 86 MeV/A12C ions

“…The quantity discussed has been the velocity fill =Vll/C of an intermediate system imparted by a fast interaction between target and projectile. Going to lower ion velocities [4,9,[11][12][13] values of /~N are found to be higher than at the highest energies. Cumming et al [4] found that fill for 2~Na and 28Mg produced in reactions with 1H, 4He and I2C on copper is a smooth function of projectile rapidity, Y =tanh-lfi, where fl is the projectile ve-locity.…”

“…At the upper part of the examined energy range, recoil data show that the momentum transfer to the target is very small, and there is little [4] if any [10,11] difference between protons and heavy ions. The quantity discussed has been the velocity fill =Vll/C of an intermediate system imparted by a fast interaction between target and projectile.…”

Radioisotope production in target fragmentation with high-energy heavy ions at HIMAC

“…Most of the products from the reactions are considered to be formed via fragmentation process [1,2]. Fragmentation process of atomic nuclei with energetic ions is thus very useful for production of radioisotopes.…”