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1
artículo
Publicado 2010
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Using a time of flight technique, the maximal values of kinetic energy as a function of primary mass of fragments from low energy fission of U-234 and U-236 were measured by Signarbieux et al. From calculations of scission configurations, it is concluded that, for those two fissioning systems, the maximal value of total kinetic energy corresponding to fragmentations (42Mo62, 50Sn80) and (42Mo64, 50Sn80) respectively, are equal to the available energies, and their scission configurations are composed by a spherical heavy fragment and a prolate light fragment, both in their ground state.
2
artículo
Publicado 2014
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Se muestra las consecuencias erosivas de la emisión de neutrones sobre la distribución de número de masa (A) y energía cinética (E) de los fragmentos de fisión inducida por neutrones térmicos de U-233 y U-235, respectivamente. Además se muestra los efectos de la ruptura de parejas de nucleones, y de la interacción electrostática entre fragmentos en el punto de escisión, sobre la distribución de masa y energía cinética en la región fría de la fisión inducida por neutrones térmicos de U-233, U-235 y Pu-239, respectivamente. La emisión de neutrones erosiona los efectos par-impar sobre la distribución de número de neutrones (δN) de los fragmentos, definido como la diferencia de los rendimientos relativos de los fragmentos con número par (N_p) y número impar (N_i) de neutrones, respectivamente. Para evitar los efectos de la emisión de neutrones, se estudia la fisión ...
3
artículo
Publicado 2018
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The Coulomb effects hypothesis is used to interpret even-odd effects of maximum total kinetic energy as a function of mass and charge of fragments from thermal neutron induced fission of 235U. Assuming spherical fragments at scission, the Coulomb interaction energy between fragments ( ) is higher than the -value, the available energy. Therefore at scission the fragments must be deformed, so that the Coulomb interaction energy does not exceed the -value. The fact that the even-odd effects in the maximum total kinetic energy as a function of the charge and mass, respectively, are lower than the even-odd effects of is consistent with the assumption that odd mass fragments are softer than the even-even fragments. Even-odd effects of charge distribution in super asymmetric fragmentation also are interpreted with the Coulomb effect hypothesis. Because the difference between and &nb...
4
artículo
Publicado 2013
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This paper shows pair breaking and electrostatic (Coulomb) interaction effects on the distribution of mass and kinetic energy in cold fission of 233U, 235U and 239Pu thermal neutron induced. The fission process ends at the scission point, when the complementary fragments 1 and 2, having masses y A1A2 are formed. Those fragments goes away each other and acquire kinetic energies y E1E2. The fragments emit neutrons eroding mass and kinetic energy distribution. In order to avoid these disturbances, cold fission, i.e. with no neutron emission, is studied. Contrary to expected, for that excitation energy region, tough weak, an even-odd effect is observed.This result is not incompatible with a strong odd-even effect on the charge distribution or neutron number distribution. Moreover In cold fission, the minimum value of total excitation energy ( ), as a function of , is correlated with the "Cou...
5
artículo
Publicado 2013
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En este trabajo se muestra los efectos de la ruptura de parejas de nucleones y de la interacción electrostática entre fragmentos sobre la distribución de masa y energía cinética en la fisión fría de la fisión de 233U, 235U y 239Pu inducida por neutrones térmicos. El proceso de fisión termina en el punto de escisión, cuando se forman los fragmentos complementarios 1 y 2, con masas y A1A2. Luego, esos fragmentos se alejan entre sí y adquieren energías cinéticas y E1E2. Los fragmentos emiten neutrones erosionando la distribución de masa y energía. Para evitar estas perturbaciones, se estudia la fisión fría i.e., fisión sin emisión de neutrones. Contrario a lo que se esperaba, en estas ventanas de energía cinética se observa un débil efecto par-impar sobre la distribución de masa de fragmentos. Por otro lado, en la fisión fría se observa que el valor mínimo de la e...
6
artículo
Publicado 2013
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This paper shows pair breaking and electrostatic (Coulomb) interaction effects on the distribution of mass and kinetic energy in cold fission of 233U, 235U and 239Pu thermal neutron induced. The fission process ends at the scission point, when the complementary fragments 1 and 2, having masses y A1A2 are formed. Those fragments goes away each other and acquire kinetic energies y E1E2. The fragments emit neutrons eroding mass and kinetic energy distribution. In order to avoid these disturbances, cold fission, i.e. with no neutron emission, is studied. Contrary to expected, for that excitation energy region, tough weak, an even-odd effect is observed.This result is not incompatible with a strong odd-even effect on the charge distribution or neutron number distribution. Moreover In cold fission, the minimum value of total excitation energy ( ), as a function of , is correlated with the "Cou...
7
artículo
Publicado 2019
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Using a time of flight technique, the maximal values of kinetic energy as a function of primary mass of fragments from low energy fission of 234U and 236U were measured by Signarbieux et al. From calculations of scission configurations, one can conclude that, for those two fissioning systems, the maximal value of total kinetic energy corresponding to fragmentations (42Mo62, 50Sn80) and (42Mo64, 50Sn80) respectively, are equal to the available energies, and their scission configurations are composed by a spherical heavy fragment and a prolate light fragment both in their ground state.
8
artículo
Publicado 2009
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Using a time of flight technique, the maximal values of the kinetic energy as a function of the primary mass of fragments from low energy fission of 234U and 236U were measured by Signarbieux et al. From calculations of scission configurations, one can conclude that, for those two fissioning systems, the maximal values of the total kinetic energy corresponding to fragmentations (42Mo62, 50Sn80) and (42Mo64, 50Sn80) respectively, are equal to the available energy, and that their scission configurations are composed of a spherical heavy fragment and a prolate light fragment, both in their ground state.
9
artículo
Publicado 2014
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The Coulomb effect hypothesis, formerly used to interpret fluctuations in the curve of maximal total kinetic energy as a function of light fragment mass in reactions 233-U (nth,f), 235-U(nth,f) and 239-Pu(nth,f), is confirmed in high kinetic energy as well as in low excitation energy windows, respectively. Data from reactions 233-U (nth,f), 235-U(nth,f), 239-Pu(nth,f) and 252-Cf(sf) show that, between two isobaric fragmentations with similar Q-values, the more asymmetric charge split reaches the higher value of total kinetic energy. Moreover, in isobaric charge splits with different Q-values, similar preference for asymmetrical fragmentations is observed in low excitation energy Windows.
10
artículo
Publicado 2019
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This paper shows pair breaking and electrostatic (Coulomb) interaction effects on the distribution of mass and kinetic energy in cold fission of 233U, 235U and 239Pu thermal neutron induced. The fission process ends at the scission point, when the complementary fragments 1 and 2, having masses y are formed. Then those fragments goes away each other and acquire kinetic energies y , reaching the detectors after emission of y neutrons, having masses and kinetic energies, respectively. As a result, in regions where the average of varies abruptly as function of , the distribution of will be wider than it was for the distribution of as a function of . Furthermore, the emission of neutrons erodes odd-even effects on the distribution of neutron number, defined as the difference between the relatives yields of fragments with even and odd, respectively. Neutron emission, consequently, also erodes ...
