EPJ Web of Conferences (Jan 2018)

Measurement of fission yields and isomeric yield ratios at IGISOL

  • Pomp Stephan,
  • Mattera Andrea,
  • Rakopoulos Vasileios,
  • Al-Adili Ali,
  • Lantz Mattias,
  • Solders Andreas,
  • Jansson Kaj,
  • Prokofiev Alexander V.,
  • Eronen Tommi,
  • Gorelov Dimitri,
  • Jokinen Ari,
  • Kankainen Anu,
  • Moore Iain D.,
  • Penttilä Heikki,
  • Rinta-Antila Sami

DOI
https://doi.org/10.1051/epjconf/201816900017
Journal volume & issue
Vol. 169
p. 00017

Abstract

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Data on fission yields and isomeric yield ratios (IYR) are tools to study the fission process, in particular the generation of angular momentum. We use the IGISOL facility with the Penning trap JYFLTRAP in Jyväskylä, Finland, for such measurements on 232Th and natU targets. Previously published fission yield data from IGISOL concern the 232Th(p,f) and 238U(p,f) reactions at 25 and 50 MeV. Recently, a neutron source, using the Be(p,n) reaction, has been developed, installed and tested. We summarize the results for (p,f) focusing on the first measurement of IYR by direct ion counting. We also present first results for IYR and relative yields for Sn and Sb isotopes in the 128-133 mass range from natU(n,f) based on γ-spectrometry. We find a staggering behaviour in the cumulative yields for Sn and a shift in the independent fission yields for Sb as compared to current evaluations. Plans for the future experimental program on fission yields and IYR measurements are discussed.