Effect of collective enhancement in level density in the fission of pre-actinides

Effect of collective enhancement in level density in the fission of pre-actinides Fission fragment angular distributions for three reactions, F19+W182,F19+Re187, and F19+Ir193, are measured in the laboratory energy range of 82–120 MeV. Extracted fission cross sections of the present systems as well as those of three others from literature (F19+Os192,F19+Pt194, and F19+Au197) are compared with the predictions of a statistical model which takes into account the effects of shell, orientation degree of freedom, and collective enhancement in level density (CELD). In all the cases, the standard statistical model predictions overestimate the measured fission cross section, indicating the presence of some amount of dynamical effects in the exit channel. A dissipation strength of 2×1021s−1 is found to be sufficient to reproduce the data of all the reactions. No scaling of fission barrier height to fit the data is required. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review C American Physical Society (APS)

Effect of collective enhancement in level density in the fission of pre-actinides

Abstract

Fission fragment angular distributions for three reactions, F19+W182,F19+Re187, and F19+Ir193, are measured in the laboratory energy range of 82–120 MeV. Extracted fission cross sections of the present systems as well as those of three others from literature (F19+Os192,F19+Pt194, and F19+Au197) are compared with the predictions of a statistical model which takes into account the effects of shell, orientation degree of freedom, and collective enhancement in level density (CELD). In all the cases, the standard statistical model predictions overestimate the measured fission cross section, indicating the presence of some amount of dynamical effects in the exit channel. A dissipation strength of 2×1021s−1 is found to be sufficient to reproduce the data of all the reactions. No scaling of fission barrier height to fit the data is required.
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Publisher
The American Physical Society
Copyright
Copyright © ©2017 American Physical Society
ISSN
0556-2813
eISSN
1089-490X
D.O.I.
10.1103/PhysRevC.96.014618
Publisher site
See Article on Publisher Site

Abstract

Fission fragment angular distributions for three reactions, F19+W182,F19+Re187, and F19+Ir193, are measured in the laboratory energy range of 82–120 MeV. Extracted fission cross sections of the present systems as well as those of three others from literature (F19+Os192,F19+Pt194, and F19+Au197) are compared with the predictions of a statistical model which takes into account the effects of shell, orientation degree of freedom, and collective enhancement in level density (CELD). In all the cases, the standard statistical model predictions overestimate the measured fission cross section, indicating the presence of some amount of dynamical effects in the exit channel. A dissipation strength of 2×1021s−1 is found to be sufficient to reproduce the data of all the reactions. No scaling of fission barrier height to fit the data is required.

Journal

Physical Review CAmerican Physical Society (APS)

Published: Jul 27, 2017

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