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Title: A systematic study of actinide production from the interactions of heavy ions with sup 248 Cm

Production cross sections for heavy actinides produced from the interactions of {sup 12}C, {sup 31}P, {sup 40}Ar, and {sup 44}Ca ions with {sup 248}Cm were measured at energies ranging from 0.98 to 1.35 X Coulomb barrier. The recoiling reaction products were collected in copper or gold catcher foils located near the {sup 248}Cm target. Separate fractions of Bk, Cf, Es, Fm, and Md were obtained from a radiochemical separation procedure. For the {sup 12}C system, a He/KCl jet was used to transport the recoiling No activities of interest to a rotating wheel system. The isotopic distributions of the actinide products were found to be essentially symmetric about the maximum with full-widths-at-half-maximum of approximately 2.5 mass units. Isotopic distributions of the {sup 12}C, {sup 31}P, {sup 40}Ar, and {sup 44}Ca systems were found to be very similar to the {sup 40,48}Ca systems studied previously. The maxima of the isotopic distributions generally occurred for those reaction channels which involved the exchange of the fewest number of nucleons between the target and projectile for which the calculated excitation energy was a positive quantity. Additionally, the maxima of the excitation functions occurred at those projectile energies which were consistent with the calculated reaction barriersmore » based upon a binary reaction mechanism. The experimental data from the four systems investigated were compared to several models of heavy ion interactions including a damped reaction mechanism, compound nucleus formation and subsequent particle evaporation, and classical partial wave calculations for binary systems.« less
Authors:
Publication Date:
OSTI Identifier:
6475811
Report Number(s):
LBL-29540
ON: DE91004421; TRN: 90-036819
DOE Contract Number:
AC03-76SF00098
Resource Type:
Technical Report
Resource Relation:
Other Information: Thesis (Ph.D.)
Research Org:
Lawrence Berkeley Lab., CA (USA)
Sponsoring Org:
DOE/ER
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ACTINIDES; ISOTOPE PRODUCTION; CURIUM 248 TARGET; HEAVY ION REACTIONS; ARGON 40 REACTIONS; CALCIUM 44 REACTIONS; CARBON 12 REACTIONS; CROSS SECTIONS; DATA ACQUISITION SYSTEMS; EXCITATION; EXPERIMENTAL DATA; FT VALUE; PHOSPHORUS 31 REACTIONS; TRANSFER REACTIONS; CHARGED-PARTICLE REACTIONS; DATA; DIRECT REACTIONS; ELEMENTS; ENERGY-LEVEL TRANSITIONS; INFORMATION; METALS; NUCLEAR REACTIONS; NUMERICAL DATA; TARGETS 652020* -- Nuclear Properties & Reactions, A=220 & above, Experimental