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

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

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Abstract

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)
Pages1-6
Number of pages6
Volume07-11-July-2015
Publication statusPublished - 2015
Event13th Nuclei in the Cosmos, NIC 2014 - Debrecen, Hungary
Duration: 7 Jul 201411 Jul 2014

Conference

Conference13th Nuclei in the Cosmos, NIC 2014
CountryHungary
CityDebrecen
Period7/07/1411/07/14

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