Fission-fragment total kinetic energy and mass yields for neutron-induced fission of 235U and 238U with En =200 keV – 30 MeV

Binary fission of 232Th and 238U induced by fast neutrons were under intent investigation in the IPPE during recent years. These measurements were performed with a twin ionization chamber with Frisch grids. Signals from the detector were digitized for further processing with a specially developed software. It results in information of kinetic energies, masses, directions and Bragg curves of registered fission fragments. Total statistics of a few million fission events were collected during each experiment. It was discovered that for several combinations of fission fragment masses their total kinetic energy was very close to total free energy of the fissioning system. The probability of such fission events for the fast neutron induced fission was found to be much higher than for spontaneous fission of 252Cf and thermal neutron induced fission of 235U. For experiments with 238U target the energy of incident neutrons were 5 MeV and 6.5 MeV. Close analysis of dependence of fission fragment distribution on compound nucleus excitation energy gave us some explanation of the phenomenon. It could be a process in highly excited compound nucleus which leads the fissioning system from the scission point into the fusion valley with high probability.

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Three Exit Channels in the Fission of 235U(n, f)

Zeitschrift für Naturforschung A ◽

10.1515/zna-1987-0802 ◽

1987 ◽

Vol 42 (8) ◽

pp. 786-790 ◽

Cited By ~ 2

Author(s):

H.-H. Knitter ◽

F.-J. Hambsch ◽

C. Budtz-Jørgensen ◽

J. P. Theobald

Keyword(s):

Kinetic Energy ◽

Coordinate System ◽

Thermal Neutron ◽

Fission Fragment ◽

Channel Model ◽

Total Kinetic Energy ◽

Fragment Mass ◽

Theoretical Predictions ◽

Induced Fission ◽

Fragment Yield

A formula for the fission fragment yield area in the coordinate system of the fragment total kinetic energy and of the fragment mass is presented. It was deduced along the lines of the multiexit- channel model of fission elaborated by Brosa, Grossmann and Müller. This formula was fitted to the fragment mass-, average total kinetic energy-, and variance distributions of the thermal neutron induced fission of 235U. The obtained parameters are compared with the theoretical predictions. Further improvements of the fragment yield representation are discussed.

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Total Kinetic Energy and Fragment Mass Distribution of Neutron-Induced Fission of U-233

10.2172/1396153 ◽

2017 ◽

Author(s):

Daniel James Higgins ◽

Kyle Thomas Schmitt ◽

Shea Morgan Mosby ◽

Fredrik Tovesson

Keyword(s):

Kinetic Energy ◽

Mass Distribution ◽

Total Kinetic Energy ◽

Fragment Mass ◽

Induced Fission

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EXCITATION ENERGY DEPENDENCE OF FRAGMENT MASS AND TOTAL KINETIC ENERGY DISTRIBUTIONS IN PROTON-INDUCED FISSION OF LIGHT ACTINIDES

Fission and Properties of Neutron-Rich Nuclei ◽

10.1142/9789812833433_0025 ◽

2008 ◽

Author(s):

I. NISHINAKA ◽

K. NISHIO ◽

M. ASAI ◽

S. ICHIKAWA ◽

K. TSUKADA ◽

...

Keyword(s):

Kinetic Energy ◽

Excitation Energy ◽

Energy Dependence ◽

Total Kinetic Energy ◽

Energy Distributions ◽

Fragment Mass ◽

Induced Fission ◽

Kinetic Energy Distributions

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Fission fragment yields and total kinetic energy release in neutron-induced fission of235,238U,and239Pu

EPJ Web of Conferences ◽

10.1051/epjconf/201816900024 ◽

2018 ◽

Vol 169 ◽

pp. 00024 ◽

Cited By ~ 1

Author(s):

F. Tovesson ◽

D. Duke ◽

V. Geppert-Kleinrath ◽

B. Manning ◽

D. Mayorov ◽

...

Keyword(s):

Kinetic Energy ◽

Kinetic Energy Release ◽

Nuclear Fission ◽

Total Kinetic Energy ◽

Experimental Techniques ◽

Science Center ◽

Fission Process ◽

Induced Fission ◽

Time Projection ◽

Energy Dependent

Different aspects of the nuclear fission process have been studied at Los Alamos Neutron Science Center (LANSCE) using various instruments and experimental techniques. Properties of the fragments emitted in fission have been investigated using Frisch-grid ionization chambers, a Time Projection Chamber (TPC), and the SPIDER instrument which employs the 2v-2E method. These instruments and experimental techniques have been used to determine fission product mass yields, the energy dependent total kinetic energy (TKE) release, and anisotropy in neutron-induced fission of U-235, U-238 and Pu-239.

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