40Ca(α,γ)44Ti and the production of 44Ti in supernovae

Author(s)

Christof Vockenhuber, C O Ouellet, L -S The, L. R. Buchmann, Jac A. Caggiano, A A Chen, John M. D'Auria, B.S. Davids, L Fogarty, D Frekers, A Hussein, D A Hutcheon, Walter Kutschera, D Ottewell, Michael Paul, M M Pavan, J Pearson, C Ruiz, G Ruprecht, M Trinczek, Anton Wallner

Abstract

The nuclide 44Ti is predicted to be produced in significant quantities in core-collapse supernovae, and indeed it has been observed in the supernova remnant Cassiopeia-A by space-based ?-ray telescopes. The main production of 44Ti takes place in the ?-rich freeze-out phase deep inside the supernova. The key reactions governing the 44Ti abundance have been identified in an earlier sensitivity study. Using the recoil mass spectrometer DRAGON at the TRIUMF-ISAC facility in Vancouver, Canada, we measured the main production reaction 40Ca(?,?) 44Ti, resulting in an increased reaction rate compared to the rate derived from previous prompt ?-ray studies, which is commonly used in supernova models. The uncertainty of the 44Ti production is now dominated by the rate of reactions with short-lived nuclides around 44Ti, namely 45V(p,?)46Cr, 44Ti(?,p)47V and 44Ti(?,?) 48Cr. The sensitivity of these reactions on the 44Ti production has been revisited. © 2008 IOP Publishing Ltd.

Organisation(s)

Isotope Physics

External organisation(s)

TRIUMF, McMaster University, Clemson University, Simon Fraser University, Universität Münster, University of Northern British Columbia (UNBC), Hebrew University Jerusalem

Journal

Journal of Physics G: Nuclear and Particle Physics

Volume

35

No. of pages

6

ISSN

0954-3899

DOI

https://doi.org/10.1088/0954-3899/35/1/014034

Publication date

2008

Peer reviewed

Yes

Austrian Fields of Science 2012

103005 Atomic physics

Portal url

https://ucrisportal.univie.ac.at/en/publications/82d9b608-ca2d-4cc4-b903-207089fcacb3