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Author Warner, R. E. ♦ Patty, R. A. ♦ Voyles, P. M. ♦ Nadasen, A. ♦ Becchetti, F. D. ♦ Brown, J. A. ♦ Esbensen, H. ♦ Galonsky, A. ♦ Kolata, J. J. ♦ Kruse, J. ♦ Lee, M. Y. ♦ Ronningen, R. M. ♦ Schwandt, P. ♦ von Schwarzenberg, J. ♦ Sherrill, B. M. ♦ Subotic, K. ♦ Wang, J. ♦ Zecher, P.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ ALPHA REACTIONS ♦ TOTAL CROSS SECTIONS ♦ SILICON ♦ HEAVY ION REACTIONS ♦ ABSORPTION ♦ HELIUM 6 REACTIONS ♦ HELIUM 8 REACTIONS ♦ LITHIUM 11 REACTIONS ♦ LITHIUM ISOTOPES ♦ BERYLLIUM 10 ♦ ENERGY ABSORPTION ♦ OPTICAL MODELS ♦ STRONG-ABSORPTION MODEL
Abstract Total reaction cross sections, {sigma}{sub {ital R}}, of 20{endash}60{ital A} MeV {sup 4,6,8}He, {sup 6{endash}9,11}Li, and {sup 10}Be were measured by injecting magnetically separated, focused, monoenergetic, identified secondary beams of those projectiles into a Si detector telescope and measuring their energy-deposition spectra. These {sigma}{sub {ital R}}{close_quote}s, accurate to about 3{percent}, were compared with predictions of optical, strong absorption, and microscopic models. The latter gave the best overall fit to the data, providing long-tailed matter densities were assumed. The best available optical potentials generally overpredicted the data by about 10{percent}. Strong absorption calculations, in which the isospin-dependent term is quite important, were often unsuccessful, especially for projectiles with large neutron excess. Two-neutron removal cross sections were measured for {sup 6}He and {sup 11}Li; the {sup 11}Li data were slightly overpredicted by a microscopic model which includes correlation effects for the {sup 11}Li valence neutrons. Both 2{ital n} and 4{ital n} removal from {sup 8}He were observed, in about a 2:1 ratio. Subtraction analysis of the data indicates that {sup 4}He is a good core within {sup 6}He and {sup 8}He, as is {sup 9}Li within {sup 11}Li. {copyright} {ital 1996 The American Physical Society.}
ISSN 05562813
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-10-01
Publisher Department Argonne National Laboratory (ANL), Argonne, IL
Publisher Place United States
Journal Physical Review, C
Volume Number 54
Issue Number 4
Organization Argonne National Laboratory (ANL), Argonne, IL


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