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Author Sugihara, T. T. ♦ Roesmer, J. ♦ Meadows, J. W. (Jr.)
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ BISMUTH 209 ♦ DISTRIBUTION ♦ ENERGY LEVELS ♦ ENERGY RANGE ♦ EXCITATION ♦ FISSION ♦ FISSION PRODUCTS ♦ MASS ♦ MEASURED VALUES ♦ NEUTRONS ♦ NUCLEAR MODELS ♦ NUCLEAR REACTIONS ♦ PROTON BEAMS ♦ PROTONS ♦ SHELL MODELS ♦ TARGETS
Abstract An asymmetric mode of mass division in the mass region 66 to 73 was observed in the fission of Bi/sup 209/ with 36-Mev prctons. At 58 Mev no evidence for asymmetric fission as a separate mode could be found. The narrowness of the 36Mev asymmetric peak led to the suggeation that the asymmetrin fission of bismuth results from the fission of a single nuclear species and from a closed-shell effect, similar to the fine structure observed in low-energy fission of heavy elements. This asymmetric fission was considered to occur from states of relatively high excitation energy. However, the possibility of asymmetric fission also occurring from atates of low excitation energy, whether following neutron evaporstion or as a consequence of an inelastic proton interaction, cannot be ruled out. (auth)
ISSN 0031899X
Educational Use Research
Learning Resource Type Article
Publisher Date 1961-02-15
Publisher Department Clark Univ., Worcester, Mass.
Journal Physical Review
Volume Number 121
Organization Clark Univ., Worcester, Mass.


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