Mass and kinetic energy distribution in cold fission of233U,235U and239Pu induced by thermal neutrons

Montoya, M.

doi:10.1007/bf01415636

Cited by 21 publications

(20 citation statements)

References 13 publications

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“…6, alpha-decay is so strong that even far from the magic number of neutrons and protons of the daughter nucleus, the emission rate is larger by many orders of magnitude than that of the other decay modes. According to our calculations, the most probable cold fission fragment (at 7=0.145) is l~176 (see [27,23]) also in good agreement with experimental results (see for example [3] [233 are l~ l~ and l~ respectively, as was obtained experimentally [2][3][4][5][6][7][8].…”

Section: Asymmetry First Nucleus With Measured ~-Decay Heavy-ion Rasupporting

confidence: 88%

Cold fission as heavy ion emission

Poenaru

Maruhn

Greiner

et al. 1987

Z. Physik A - Atomic Nuclei

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The last version of the analytical superasymmetric fission model is applied to study cold fission processes. Strong shell effects are present either in one or both fission fragments. A smooth behaviour is observed when the proton or the neutron numbers are changed by four units. Increasing Z and N, in the transuranium region, a sharp transition from asymmetry with a large peak-to-valley ratio to symmetry at Z = 100 and/or N = 164 is obtained. The transition toward asymmetry at higher Z and N is much smoother. The most probable cold fission light fragments from 234U, 236U, 239Np and 24~ are l~176 ~~ l~ and 1~ respectively, in good agreement with experimental data. The unified treatment of alpha decay, heavy ion radioactivities and cold fission is illustrated for 234U the first nucleus in which all three groups have been already observed.

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Section: Asymmetry First Nucleus With Measured ~-Decay Heavy-ion Rasupporting

confidence: 88%

Cold fission as heavy ion emission

Poenaru

Maruhn

Greiner

et al. 1987

Z. Physik A - Atomic Nuclei

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“…3 and 4 for the systems 236U and 234U, respectively. In both cases, shoulders in the TKE-lines are observed [10]. These shoulders could be interpreted by the Coulomb effect as follows.…”

Section: Total Kinetic Energymentioning

confidence: 86%

Coulomb effects in low energy fission

Montoya

Hasse

Koczoń

1986

Z. Physik A - Atomic Nuclei

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The structures in the total kinetic energy (TKE) distributions in cold fission of 234U and 236U are interpreted in terms of the Coulomb interaction energy (C) between fragments at the scission point. The maximal value of C, Ca,x, corresponding to the most compact scission configuration, is calculated for several mass fragmentations. It is shown that with Q being constant, Cmax increases if one increases the charge asymmetry for a given primary fragmentation. This condition produces oscillations with a period of approximately 5 amu of Cmax as a function of the light fragment mass which are correlated with the observed oscillations of the maximal value of TKE. Moreover, the enhancement of the yields of the more asymmetric charge fragmentation for a given fragmentation is explained.

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“…A lower P permits to reach a more compact scission configuration which implies a higher Coulomb Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. energy, then a higher yield of charge for the higher values of kinetic energy [6,7]. Moreover, a higher free energy (F=Q−P) of a given configuration implies a higher probability for that configuration to occur.…”

Section: Introductionmentioning

confidence: 99%

“…In this cold fission region, it was observed that for two isobaric fragmentations with the similar Q-value, the more asymmetric charge split (lower light fragment charge) occurs with higher probability. This property was named Coulomb effect [6,7].…”

Section: Introductionmentioning

confidence: 99%

Influence of neutron emission on the charge, mass and kinetic energy distribution of final fragments from ²³⁵U(n_th, f) reaction

Montoya

Rivera

2018

J. Phys. Commun.

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Using a Monte Carlo method we simulate an experiment that measures the mass, charge and kinetic energy of final fragments (after neutron emission) from the 235 U(n th , f) reaction. As input data for the simulation, for primary fragments (before neutron emission), we assume (i) a distribution of mass and kinetic energy; (ii) an average number of emitted neutron as a decreasing linear function of kinetic energy and (iii) for each mass, a constant yield of charges as a function of kinetic energy, equal to that obtained by W Lang et al for the highest measured kinetic energy window (108.5 MeV) which corresponds to the lowest measured excitation energy, that corresponds to the so called cold fission. The output of the simulation is the distribution of mass, charge and kinetic energy of final fragments. From this output we obtain that, for a given mass, the charge that has the highest yield in cold fission region has a yield obeying an increasing function of kinetic energy in all other region. Conversely, the yield of the less probable charge in cold fission is a decreasing function of kinetic energy in all other region. Our results of simulation suggest that, for two primary isobaric fragmentations with similar Q-value, the preference for more asymmetric charge splits (called Coulomb effect), observed in cold fission, is valid in all region, but neutron emission shadows this property in final fragments distribution.

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Mass and kinetic energy distribution in cold fission of233U,235U and239Pu induced by thermal neutrons

Cited by 21 publications

References 13 publications

Cold fission as heavy ion emission

Cold fission as heavy ion emission

Coulomb effects in low energy fission

Influence of neutron emission on the charge, mass and kinetic energy distribution of final fragments from ²³⁵U(n_th, f) reaction

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Mass and kinetic energy distribution in cold fission of233U,235U and239Pu induced by thermal neutrons

Cited by 21 publications

References 13 publications

Cold fission as heavy ion emission

Cold fission as heavy ion emission

Coulomb effects in low energy fission

Influence of neutron emission on the charge, mass and kinetic energy distribution of final fragments from 235U(nth, f) reaction

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Product

Resources

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Influence of neutron emission on the charge, mass and kinetic energy distribution of final fragments from ²³⁵U(n_th, f) reaction