Mass and charge distributions in iron-induced reactions and excitation energy division between the fragments of the 672-MeV [sup 56]Fe + [sup 165]Ho reaction

Technical Report · Fri Jan 01 04:00:00 EST 1993

DOI:https://doi.org/10.2172/6804700· OSTI ID:6804700

Madani, H

The projectile-like and target-like fragments produced by the 12-MeV/nucleon [sup 56]Fe + [sup 165]Ho reaction were detected in coincidence. The measured parameters were the mass, charge, kinetic energy scattering angle of the projectile-like fragments, and the scattering angle of the target-like fragments. The mass and charge distributions of the projectile-like fragments were generated as a function of energy loss, and characterized by their centroids, variances, and correlation coefficients. The neutron drift of the measured projectile-like products is mostly due to evaporative processes, while the charge drift is a result of a net transfer of protons from the projectile-like fragment to the target-like fragment. The result is a weak drift of the system towards mass asymmetry. The predictions of two nucleon exchange models are compared to the experimental results of the 672-MeV [sup 56]Fe + [sup 165]Ho reaction and other Fe-induced reactions. The fairly good agreement between the experimental and theoretical variances verifies the prevalence of a nucleon exchange mechanism in these reactions. The information from the coincidence measurement and two-body kinematics are used to reconstruct the pre-evaporation masses of the projectile-like and target-like fragments of the reaction. Statistical evaporation calculations are used to translate these masses into excitation energies of the primary fragments. The ratio of excitation energy stored in the projectile-Mm fragment decreases with increasing energy loss, in qualitative agreement with previous measurements; however, higher ratios are observed for the 672-MeV [sup 56]Fe on [sup 165]Ho system.

• Research Organization: Maryland Univ., College Park, MD (United States). Dept. of Chemistry
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG05-87ER40321
• OSTI ID: 6804700
• Report Number(s): DOE/ER/40321-11; ON: DE93013385
• Country of Publication: United States
• Language: English

Related Subjects

663450* -- Heavy-Ion-Induced Reactions & Scattering-- (1992-)
663570 -- Nuclear Mass Ranges-- A=150-189-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CHARGE DISTRIBUTION
CHARGED-PARTICLE REACTIONS
DATA
DEEP INELASTIC HEAVY ION REACTIONS
ENERGY
ENERGY RANGE
EXPERIMENTAL DATA
HEAVY ION REACTIONS
HOLMIUM 165 TARGET
INFORMATION
IRON 56 REACTIONS
KINETIC ENERGY
KINETICS
MASS
MEV RANGE
MEV RANGE 100-1000
NUCLEAR REACTION KINETICS
NUCLEAR REACTIONS
NUMERICAL DATA
REACTION KINETICS
TARGETS