University of Hertfordshire

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Angular distribution in the neutron-induced fission of actinides

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Original languageEnglish
Title of host publicationEPJ Web of Conferences
PublisherEDP Sciences
Pages08003
Number of pages7
Volume62
ISBN (Print)9782759811236
DOIs
Publication statusPublished - 13 Dec 2013
EventFission 2013 - 5th Int Workshop on Nuclear Fission & Fission Product Spectroscopy - Cain, France
Duration: 28 May 201331 May 2013

Conference

ConferenceFission 2013 - 5th Int Workshop on Nuclear Fission & Fission Product Spectroscopy
CountryFrance
CityCain
Period28/05/1331/05/13

Abstract

Above 1 MeV of incident neutron energy the fission fragment angular distribution (FFAD) has generally a strong anisotropic behavior due to the combination of the incident orbital momentum and the intrinsic spin of the fissioning nucleus. This effect has to be taken into account for the efficiency estimation of devices used for fission cross section measurements. In addition it bears information on the spin deposition mechanism and on the structure of transitional states. We designed and constructed a detection device, based on Parallel Plate Avalanche Counters (PPAC), for measuring the fission fragment angular distributions of several isotopes, in particular Th. The measurement has been performed at n-TOF at CERN taking advantage of the very broad energy spectrum of the neutron beam. Fission events were recognized by back to back detection in coincidence in two position-sensitive detectors surrounding the targets. The detection efficiency, depending mostly on the stopping of fission fragments in backings and electrodes, has been computed with a Geant4 simulation and validated by the comparison to the measured case of U below 3 keV where the emission is isotropic. In the case of Th, the result is in good agreement with previous data below 10 MeV, with a good reproduction of the structures associated to vibrational states and the opening of second chance fission. In the 14 MeV region our data are much more accurate than previous ones which are broadly scattered.

Notes

This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited

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