By the same authors

The abundance of 44Ti in core collapse supernovae: Measuring the 44Ti(α, p)47V reaction

Research output: Chapter in Book/Report/Conference proceedingConference contribution


  • A. St J Murphy
  • T. Davinson
  • A. Kankainen
  • G. Lotay
  • D. J. Mountford
  • C. D. Murphy
  • P. J. Woods
  • R. Dressler
  • D. Schumann
  • T. Stowasser
  • J. Fallis
  • A. M. Laird
  • C. Seiffert
  • T. Stora
  • C. H T Wang


Publication details

Title of host publicationProceedings of Science
DatePublished - 2014
PublisherProceedings of Science (PoS)
Original languageEnglish


Space-based γ-ray satellites such as BeppoSAX, COMPTEL and INTEGRAL have reported detection of 44Ti in the Cassiopeia-A and SN1987a core-collapse supernova remnants. The NuSTAR satellite has recently measured the distribution of 44Ti γ-ray emission in Cassiopeia-A finding a highly asymmetric distribution. In all cases, the amounts of 44Ti inferred in the ejecta are higher than expected, even assuming a wide range of progenitor models and masses. The dominant nuclear uncertainty within such models is the rate of the 44Ti(α, p)47V nuclear reaction rate. Through radiochemical separation, a sample of 44Ti was obtained from highly-irradiated martensitic steel accelerator components of the Paul Scherrer Institute. Transported to CERN, this material was then developed into a beam at the REX-ISOLDE facility and directed onto a gas filled cell. This enabled a study of the 44Ti(α, p)47V reaction at an energy of Ecm=4.15 MeV, finding an upper limit for the cross section of 40 μb (68% c.l.). Possible implications for core collapse supernovae are presented.

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