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

Fragment shell effect in low energy fission: Independent yields of technetium isotopes in the thermal-neutron-induced fission ofPu239

1986 ◽  
Vol 33 (3) ◽  
pp. 969-973 ◽  
Author(s):  
Alok Srivastava ◽  
A. Goswami ◽  
B. K. Srivastava ◽  
A. G. C. Nair ◽  
S. B. Manohar ◽  
...  
Keyword(s):  
Thermal Neutron ◽  
Low Energy ◽  
Shell Effect ◽  
Induced Fission

Nuclear-charge distribution forA=121from thermal-neutron-induced fission ofU235

1985 ◽  
Vol 31 (4) ◽  
pp. 1334-1339 ◽  
Author(s):  
Larry Robinson ◽  
Arthur C. Wahl ◽  
Tomasz M. Semkow ◽  
Andrew E. Norris
Keyword(s):  
Thermal Neutron ◽  
Charge Distribution ◽  
Nuclear Charge ◽  
Nuclear Charge Distribution ◽  
Induced Fission

scholarly journals Fission fragments observables measured at the LOHENGRIN spectrometer

2020 ◽  
Vol 239 ◽  
pp. 05017
Author(s):  
S. Julien-Laferrière ◽  
L. Thombansen ◽  
G. Kessedjian ◽  
A. Chebboubi ◽  
O. Serot ◽  
...  
Keyword(s):  
Neutron Emission ◽  
Evaluation Process ◽  
Nuclear Data ◽  
Nuclear Fission ◽  
Experimental Program ◽  
Spent Fuel ◽  
Ionic Charge ◽  
Fission Fragments ◽  
Common Effort ◽  
Fission Yields

Nuclear fission yields are key data for reactor studies, such as spent fuel inventory or decay heat, and for understanding fission process. Despite a significant effort allocated to measure fission yields during the last decades, the recent evaluated libraries still need improvements in particular in the reduction of the uncertainties. Moreover, some discrepancies between these libraries must be explained. Additional measurements provide complementary information and estimations of experimental correlations, and new kinds of measurements enable to test the models used during the nuclear data evaluation process. A common effort by the CEA, the LPSC and the ILL aims at tackling these issues by providing precise measurements of isotopic and isobaric fission yields with the related variance-covariance matrices. Additionally, the experimental program involves a large range of observables requested by the evaluations, such as kinetic energy dependency of isotopic yields and odd-even effect in order to test the sharing of total excitation energy and the spin generation mechanism. Another example is the complete range of isotopic distribution per mass that allows the determination of the charge polarization, which has to be consistent for complementary masses (pre-neutron emission). For instance, this information is the key observable for the evaluation of isotopic yields. Finally, ionic charge distributions are indirect measurements of nanosecond isomeric ratios as a probe of the nuclear de-excitation path in the (E*, J, π) representation. Measurements for thermal neutron induced fission of 241 Pu have been carried out at the ILL in Grenoble, using the LOHENGRIN mass spectrometer. Methods, results and comparison to models calculations will be presented corresponding to a status on fission fragments observables reachable with this facility.

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