Analysis of Fragment Mass Distribution in Asymmetric Area at Fission of {sup 235}U Induced by Thermal Neutrons

The fragment mass yields in fission of {sup 235}U induced by thermal neutrons for A=145 - 160 and E{sub K}=50 - 75 MeV were measured using a mass spectrometer. The fine structure is observed at A=153, 154 and E{sub K}=50 - 60 MeV. The obtained results were described in the framework of a model based...

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Bibliographic Details
Published in:Physics of atomic nuclei 2005-02, Vol.68 (2)
Main Authors: Pikul, V.P., Koblik, Yu.N., Khugaev, A.V., Yuldashev, B.S., Jovliev, U.Yu, Muminov, A.I., Pavliy, K.V., Nasirov, A.K., Bogolyubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna, Moscow oblast, 141980
Format: Article
Language:English
Subjects:
ASYMMETRY
CORRELATIONS
DEFORMED NUCLEI
FINE STRUCTURE
FISSION
FISSION FRAGMENTS
FISSION PRODUCTS
KINETIC ENERGY
MASS DISTRIBUTION
MASS SPECTROMETERS
MEV RANGE
NUCLEAR PHYSICS AND RADIATION PHYSICS
NUCLEAR REACTION YIELD
SHELL MODELS
THERMAL NEUTRONS
TIME DEPENDENCE
URANIUM 235
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Summary:The fragment mass yields in fission of {sup 235}U induced by thermal neutrons for A=145 - 160 and E{sub K}=50 - 75 MeV were measured using a mass spectrometer. The fine structure is observed at A=153, 154 and E{sub K}=50 - 60 MeV. The obtained results were described in the framework of a model based on the dinuclear system concept. The analyzed correlation between the total kinetic energy and mass distribution of fission fragments is connected with the shell structure of the formed fragments of fission. From this correlation and the time dependence of the calculated mass distribution of the binary reaction products, one can conclude that the descent time from a saddle point to a scission point for the more deformed fragments is longer than that for fragments of more compact shape.
ISSN:1063-7788
1562-692X
DOI:10.1134/1.1866373