Formation of large target residues in intermediate energy nuclear collisions

Conference · Wed Apr 01 00:00:00 EST 1987

OSTI ID:6346305

Loveland, W; Aleklett, K; Sihver, L; Xu, Z; Seaborg, G T

We have used radiochemical techniques to measure the yields, angular distributions and velocity spectra of the large (A/sub frag/ greater than or equal to 2/3 A/sub tgt/) target residues from the fragmentation of /sup 197/Au by intermediate energy /sup 12/C, /sup 20/Ne, /sup 32/S, /sup 40/Ar, /sup 84/Kr, and /sup 139/La projectiles. The fragment moving frame angular distributions are asymmetric for the lighter projectiles (C-Ar). The fragment velocity spectra are Maxwellian for the Kr induced reactions and non-Maxwellian for the reactions induced by the lighter ions. We interpret these results in terms of a change in the dominant fragment production mechanism(s) from one(s) involving a fast non-equilibrium process for the lighter ions to a slow, equilibrium process for Kr. Comparison of the measured yields and angular distributions with calculations made using a Boltzmann transport equation with appropriate modifications for Pauli blocking, etc., show excellent agreement between data and theory. 12 refs., 12 figs.

• Research Organization: Lawrence Berkeley Lab., CA (USA); Oregon State Univ., Corvallis (USA); Uppsala Univ., Nykoeping (Sweden). Studsvik Neutron Research Lab.
• DOE Contract Number: AM06-70RL02227; AC03-76SF00098
• OSTI ID: 6346305
• Report Number(s): LBL-23365; CONF-870410-23; ON: DE87010257
• Conference Information: 193. national meeting of the American Chemical Society, Denver, CO, USA, 5 Apr 1987
• Country of Publication: United States
• Language: English

Related Subjects

651920* -- Nuclear Properties & Reactions
A=190-219
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALINE EARTH ISOTOPES
ANGULAR DISTRIBUTION
ARGON 40 REACTIONS
BARIUM 131
BARIUM ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CARBON 12 REACTIONS
CERIUM 139
CERIUM ISOTOPES
CHARGED-PARTICLE REACTIONS
COBALT 58
COBALT ISOTOPES
DATA
DAYS LIVING RADIOISOTOPES
DISTRIBUTION
DYSPROSIUM 155
DYSPROSIUM ISOTOPES
ELECTRON CAPTURE RADIOISOTOPES
ENERGY RANGE
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
GADOLINIUM 147
GADOLINIUM ISOTOPES
GOLD 197 TARGET
HEAVY ION REACTIONS
HOURS LIVING RADIOISOTOPES
INDIUM 111
INDIUM ISOTOPES
INFORMATION
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
KRYPTON 84 REACTIONS
LANTHANUM 139 REACTIONS
LUTETIUM 171
LUTETIUM ISOTOPES
MEV RANGE
MEV RANGE 10-100
MINUTES LIVING RADIOISOTOPES
MOLYBDENUM 99
MOLYBDENUM ISOTOPES
NEON 20 REACTIONS
NUCLEAR FRAGMENTS
NUCLEAR REACTIONS
NUCLEI
NUMERICAL DATA
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
RADIOISOTOPES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
SULFUR 32 REACTIONS
TARGETS
TECHNETIUM 96
TECHNETIUM ISOTOPES
THEORETICAL DATA
YEARS LIVING RADIOISOTOPES
YTTRIUM 87
YTTRIUM ISOTOPES