Title: The impact of neutron emission on correlated fission data from the 2E-2v method
Authors: JANSSON K.AL-ADILI A.ANDERSSON SUNDÉN E.GÖÖK ALFOBERSTEDT STEPHANPOMP S.
Citation: EUROPEAN PHYSICAL JOURNAL A vol. 54 no. 114
Publisher: SPRINGER
Publication Year: 2018
JRC N°: JRC108095
ISSN: 1434-6001
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC108095
DOI: 10.1140/epja/i2018-12544-0
Type: Articles in periodicals and books
Abstract: The double-energy double-velocity (2E-2v) method allows assessing fission-fragment mass yields prior to and after prompt neutron emission with high resolution. It is, therefore, considered as a complementary technique to assess average prompt neutron multiplicity as a function of fragment properties. We have studied the intrinsic features of the 2E-2v method by means of event-wise generated fission-fragment data and found short-comings in the method itself as well as in some common practice of application. We find that the 2E-2v method leads to large deviations in the correlation between the prompt neutron multiplicity and pre-neutron mass, which deforms and exaggerates the so called 'sawtooth' shape of v(A). We have identified the treatment of prompt neutron emission from the fragments as the origin of the problem. The intrinsic nature of this deficiency risks to render 2E-2v experiments less interesting. We suggest a method to correct the 2E-2v data that can even be applied on existing measurements.
JRC Directorate:Nuclear Safety and Security

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