High-precision mass measurements for the isobaric multiplet mass equation at A = 52

Research output: Contribution to journalArticle


Masses of 52Co, 52Com, 52Fe, 52Fem, and 52Mn have been measured with the JYFLTRAP double Penning trap mass spectrometer. The isobaric multiplet mass equation for the T = 2 quintet at A = 52 has been studied employing the new mass values. No significant breakdown (beyond the level) of the quadratic form of the IMME was observed (). The cubic coefficient was 6.0(32) keV (). The excitation energies for the isomer and the T = 2 isobaric analog state in 52Co have been determined to be 374(13) keV and 2922(13) keV, respectively. The measured mass values for 52Co and 52Com are 29(10) keV and 16(15) keV higher, respectively, than obtained in a recent storage-ring experiment, and significantly lower than predicted by extrapolations. Consequently, this has an impact on the proton separation energies for 52Co and 53Ni relevant for the astrophysical rapid proton capture process. The Q value for the proton decay from the isomer in 53Co has been determined with an unprecedented precision, keV.


  • D. A. Nesterenko
  • A. Kankainen
  • L. Canete
  • M Block
  • D. M. Cox
  • Jussi T. Eronen
  • J Gerl
  • J Hakala
  • A Jokinen
  • V. S. Kolhinen
  • J. Koponen
  • Natasa Lalovic
  • Ch Lorenz
  • I. D. Moore
  • P. Papadakis
  • J. Reinikainen
  • S. Rinta-Antila
  • Anne Voss
  • J. Äystö
External organisations
  • University of Jyväskylä
  • GSI Helmholtz Centre for Heavy Ion Research
  • University of Mainz
  • University of Helsinki
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics


  • isobaric multiplet, mass measurement, Penning trap
Original languageEnglish
Article number065103
Number of pages19
JournalJournal of Physics G: Nuclear and Particle Physics
Issue number6
Publication statusPublished - 2017 Apr 19
Publication categoryResearch

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