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

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

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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.

Original languageEnglish
Title of host publicationProceedings of Science
PublisherProceedings of Science (PoS)
Number of pages6
Publication statusPublished - 2015
Event13th Nuclei in the Cosmos, NIC 2014 - Debrecen, Hungary
Duration: 7 Jul 201411 Jul 2014


Conference13th Nuclei in the Cosmos, NIC 2014

ASJC Scopus subject areas

  • General

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    Murphy, A. S. J., Davinson, T., Kankainen, A., Lotay, G., Mountford, D. J., Murphy, C. D., Woods, P. J., Dressler, R., Schumann, D., Stowasser, T., Fallis, J., Laird, A. M., Seiffert, C., Stora, T., & Wang, C. H. T. (2015). The abundance of 44Ti in core collapse supernovae: Measuring the 44Ti(α, p)47V reaction. In Proceedings of Science (Vol. 07-11-July-2015, pp. 1-6). [126] Proceedings of Science (PoS).