Edinburgh Research Explorer

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

Related Edinburgh Organisations

Original languageEnglish
Title of host publicationProceedings of Science
PublisherProceedings of Science (PoS)
Volume07-11-July-2015
StatePublished - 2014
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

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.

Event

13th Nuclei in the Cosmos, NIC 2014

7/07/1411/07/14

Debrecen, Hungary

Event: Conference

ID: 25645017