The impact of neutron emission on correlated fission data from the 2E-2v method

  • Kaj Jansson
  • Ali Al-Adili
  • Erik Andersson Sundén
  • Alf Göök
  • Stephan Oberstedt
  • Stephan Pomp
Regular Article - Experimental Physics


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 practices 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 \(\bar{\nu}(A)\). 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 2E-2v data that can even be applied on existing measurements.


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Copyright information

© SIF, Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Kaj Jansson
    • 1
  • Ali Al-Adili
    • 1
  • Erik Andersson Sundén
    • 1
  • Alf Göök
    • 2
  • Stephan Oberstedt
    • 2
  • Stephan Pomp
    • 1
  1. 1.Department of Physics and AstronomyUppsala UniversityUppsalaSweden
  2. 2.European Commission, DG Joint Research Centre, Directorate G - Nuclear Safety and Security, Unit G.2 SN3SGeelBelgium

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