Measurement of the Variance of the Number of Neutrons Emitted in Fission ofCf252as a Function of the Fragment Mass and Total Kinetic Energy

Strutinsky-type calculations indicate that the potential energy favors four channels in the nuclear fission of 252Cf. The connection of this finding with experimental results on the distribution of fragment mass, total kinetic energy, neutron multiplicities, and relative abundances is discussed. Similar calculations for 227Ac, 236U, and 258Fm show that the changing preponderance of the four channels seems to describe striking trends in the fission of the actinides, in particular the dip in the total kinetic energy at symmetrical fission of 236U and the enormously high average kinetic energy of the 258Fm fragments.

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Fission fragment mass and total kinetic energy distributions of spontaneously fissioning plutonium isotopes

EPJ Web of Conferences ◽

10.1051/epjconf/201816900016 ◽

2018 ◽

Vol 169 ◽

pp. 00016 ◽

Cited By ~ 2

Author(s):

K. Pomorski ◽

B. Nerlo-Pomorska ◽

J. Bartel ◽

C. Schmitt

Keyword(s):

Kinetic Energy ◽

Fission Fragment ◽

Potential Energy Surfaces ◽

Total Kinetic Energy ◽

Energy Distributions ◽

Plutonium Isotopes ◽

Fragment Mass ◽

Calculated Mass ◽

Fission Probability ◽

Kinetic Energy Distributions

The fission-fragment mass and total kinetic energy (TKE) distributions are evaluated in a quantum mechanical framework using elongation, mass asymmetry, neck degree of freedom as the relevant collective parameters in the Fourier shape parametrization recently developed by us. The potential energy surfaces (PES) are calculated within the macroscopic-microscopic model based on the Lublin-Strasbourg Drop (LSD), the Yukawa-folded (YF) single-particle potential and a monopole pairing force. The PES are presented and analysed in detail for even-even Plutonium isotopes with A = 236–246. They reveal deep asymmetric valleys. The fission-fragment mass and TKE distributions are obtained from the ground state of a collective Hamiltonian computed within the Born-Oppenheimer approximation, in the WKB approach by introducing a neck-dependent fission probability. The calculated mass and total kinetic energy distributions are found in good agreement with the data.

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Prompt Neutrons From 236U Fission Fragments

Australian Journal of Physics ◽

10.1071/ph710821 ◽

1971 ◽

Vol 24 (4) ◽

pp. 821 ◽

Cited By ~ 36

Author(s):

JW Boldeman ◽

AR de L Musgrove ◽

RL Walsh

Keyword(s):

Kinetic Energy ◽

Thermal Neutron ◽

Neutron Emission ◽

Total Kinetic Energy ◽

Counting Method ◽

Neutron Fission ◽

Fragment Mass ◽

Fission Fragments ◽

Thermal Neutron Fission ◽

The Mean

Measurements have been made of prompt neutron emission in the thermal neutron fission of 235 U and the mean neutron emission per fragment has been obtained for particular values of the fragment mass and total kinetic energy. A direct neutron counting method was employed and a comparison is made with data from previous experiments of this type.

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