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Title: Excitation functions for production of heavy actinides from interactions of /sup 40/Ca and /sup 48/Ca ions with /sup 248/Cm

Excitation functions have been measured for production of isotopes of Bk through Fm in bombardments of /sup 248/Cm with 234- to 294-MeV /sup 40/Ca ions and with 239- to 318-MeV /sup 48/Ca ions. The maxima of the isotopic distributions for these elements occur at only 2 to 3 mass numbers larger for /sup 48/Ca than for /sup 40/Ca reactions. The shapes of the distributions and the half-widths of about 2.5 mass numbers are quite similar to those observed previously for reactions of /sup 16/O, /sup 18/O, /sup 20/Ne, and /sup 22/Ne with /sup 248/Cm. In general, the excitation functions for /sup 40/Ca show maxima near the Coulomb barrier while those for /sup 48/Ca are about 20 MeV above the barrier. The cross sections decrease rather slowly with increasing projectile energy over the energy range studied, indicating that the additional projectile energy is not manifested as excitation energy of these actinide products.
Authors:
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Publication Date:
OSTI Identifier:
5772742
Resource Type:
Journal Article
Resource Relation:
Journal Name: Phys. Rev. C; (United States); Journal Volume: 31:5
Research Org:
Isotope and Nuclear Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; BERKELIUM ISOTOPES; ISOTOPE PRODUCTION; CALCIUM 40 REACTIONS; COMPOUND-NUCLEUS REACTIONS; CALCIUM 48 REACTIONS; CALIFORNIUM ISOTOPES; CURIUM 248 TARGET; EINSTEINIUM ISOTOPES; FERMIUM ISOTOPES; ANGULAR DISTRIBUTION; COULOMB FIELD; CROSS SECTIONS; EXCITATION FUNCTIONS; EXPERIMENTAL DATA; MASS SPECTRA; MEV RANGE 100-1000; ACTINIDE ISOTOPES; CHARGED-PARTICLE REACTIONS; DATA; DISTRIBUTION; ELECTRIC FIELDS; ENERGY RANGE; FUNCTIONS; HEAVY ION REACTIONS; INFORMATION; ISOTOPES; MEV RANGE; NUCLEAR REACTIONS; NUMERICAL DATA; SPECTRA; TARGETS 652025* -- Nuclear Properties & Reactions, A=220 & above, Experimental-- Nuclear Reactions & Scattering-- (-1987)