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.
|Title of host publication||Proceedings of Science|
|Publisher||Proceedings of Science (PoS)|
|Publication status||Published - 2014|
|Event||13th Nuclei in the Cosmos, NIC 2014 - Debrecen, Hungary|
Duration: 7 Jul 2014 → 11 Jul 2014
|Conference||13th Nuclei in the Cosmos, NIC 2014|
|Period||7/07/14 → 11/07/14|