scholarly journals Measurement of Level Density Parameters of Fission Fragments Following Thermal Neutron Induced Fission of Uranium-235

1997 ◽  
Vol 34 (5) ◽  
pp. 439-444
Author(s):  
Katsuhisa NISHIO ◽  
Itsuro KIMURA ◽  
Yoshihiro NAKAGOME
Keyword(s):  
Thermal Neutron ◽  
Level Density ◽  
Fission Fragments ◽  
Induced Fission

scholarly journals Influence of spin on fission fragments anisotropy

2005 ◽  
Vol 20 (1) ◽  
pp. 45-49
Author(s):  
Omid Ghodsi ◽  
Aziz Behkami ◽  
Farhad Rahimi
Keyword(s):  
Experimental Data ◽  
Level Density ◽  
Couple Channel ◽  
Spin Effect ◽  
Nuclear Level Density ◽  
Nuclear Level ◽  
Fission Fragments ◽  
Fragment Angular Distribution ◽  
Induced Fission ◽  
Channel Spin

An analysis of selected fission fragment angular distribution when at least one of the spins of the projectile or target is appreciable in induced fission was made by using the statistical scission model. The results of this model predicate that the spins of the projectile or target are affected on the nuclear level density of the compound nucleus. The experimental data was analyzed by means of the couple channel spin effect formalism. This formalism suggests that the projectile spin is more effective on angular anisotropies within the limits of energy near the fusion barrier.

scholarly journals Experimental estimation of the “scission” neutron yield in the thermal neutron induced fission of 233U and 235U

2020 ◽  
Vol 239 ◽  
pp. 05008
Author(s):  
Alexander Vorobyev ◽  
Oleg Shcherbakov ◽  
Alexei Gagarski ◽  
Gennadi’ski Val ◽  
Tatiana’mina Kuz
Keyword(s):  
Thermal Neutron ◽  
Neutron Yield ◽  
Research Reactor ◽  
Center Of Mass ◽  
Energy Distributions ◽  
Mass System ◽  
Fission Fragments ◽  
Experimental Estimation ◽  
Fission Neutrons ◽  
Induced Fission

The analysis of angular and energy distributions of prompt neutrons from the thermal neutron induced fission of 233U and 235U measured recently in the WWR-M research reactor (Gatchina, Russia) have been performed. The yield of “scission” neutrons has been estimated by comparing the measured distributions with calculations within the model of emission of neutrons from completely accelerated fragments. Besides taking into account “scission” neutrons, for the best description of measured angular and energy distributions of fission neutrons, the calculation should be performed under the assumption that neutrons with a higher (7-9%) probability are emitted along the fission axis in the center-of-mass system of fission fragments.

INDEPENDENT YIELDS OF 124Sb AND 126sb IN THERMAL NEUTRON INDUCED FISSION AND THEIR IMPLICATION ON THE EMPIRICAL Zp FUNCTION

1965 ◽  
Vol 43 (9) ◽  
pp. 2493-2507 ◽  
Author(s):  
P. O. Strom ◽  
G. R. Grant ◽  
A. C. Pappas
Keyword(s):  
Thermal Neutron ◽  
Charge Distribution ◽  
Distribution Curve ◽  
Neutron Emission ◽  
Shell Effect ◽  
Shell Effects ◽  
Fission Fragments ◽  
Induced Fission ◽  
Fission Yields ◽  
Proton Shell

The independent fission yields in thermal neutron induced fission of 235U have been measured to be (9.5 ± 1.4)•10−6% and (1.04 ± 0.17)•10−3% for 124gSb and 126gSb, respectively. The total independent yields for all isomers of these nuclides are estimated to be (1.2 ± 0.2)•10−5% for 124Sb and (3.7 ± 0.6)•10−3% for 126Sb using a Huizenga–Vandenbosch approach for estimating population of isomeric states.These data do not seem to support a 50 proton shell effect on the Zp function, using the "unique" charge distribution curve of Wahl. A revised Wahl plot based on recent information on neutron emission from individual fission fragments is given and discussed in view of shell effects in fission. It is shown that the effect of the Zp function of the 50 proton shell is very small.

Nuclear charge distribution of heavy fission fragments from thermal-neutron-induced fission of235U

1970 ◽  
Vol 231 (1) ◽  
pp. 59-97 ◽  
Author(s):  
Ewald Konecny ◽  
Helmut Gunther ◽  
Helmut Rösler ◽  
Günter Siegert ◽  
Heinz Ewald
Keyword(s):  
Thermal Neutron ◽  
Charge Distribution ◽  
Nuclear Charge ◽  
Fission Fragments ◽  
Nuclear Charge Distribution ◽  
Fission Of235u ◽  
Induced Fission

scholarly journals Calculation of the Prompt Gamma Energy of Individual Fission Fragments from the Prompt Neutron Numbers

1973 ◽  
Vol 26 (3) ◽  
pp. 279
Author(s):  
Shankar Mukherji ◽  
KB Lal ◽  
Tejasvi Sharma
Keyword(s):  
Thermal Neutron ◽  
Liquid Drop ◽  
Prompt Gamma ◽  
Preliminary Treatment ◽  
Liquid Drop Model ◽  
Gamma Energy ◽  
Quantum Energy ◽  
Fission Fragments ◽  
Induced Fission ◽  
Good Agreement

Approximate calculations of the prompt )I-ray energies of fission fragments and the total kinetic energies of different fragment pairs have been made on the basis of a liquid-drop model. In addition, reliable estimates� of the quantum energy for collective quadrupolar vibration have been used to calculate the number of prompt )I-ray quanta emitted by the fragments from the thermal-neutron-induced fission of 235U. There seems to be good agreement with the available experimental data. About 30 pairs of fission fragments from the thermal-neutron-induced fission of 233U, 235U, and 239Pu and the spontaneous fission of 252Cf have been included in this preliminary treatment.

Discontinuity in Isotopic Mass Dispersion in Thermal-Neutron-Induced Fission ofU235

1970 ◽  
Vol 2 (6) ◽  
pp. 2403-2405 ◽  
Author(s):  
M. Talât-Erben ◽  
Binay Dağsöz (Güven)
Keyword(s):  
Thermal Neutron ◽  
Mass Dispersion ◽  
Induced Fission
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