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

Autor(en)

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

Abstrakt

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(en)

Isotopenphysik

Externe Organisation(en)

TRIUMF Canada's National Laboratory for Particle and Nuclear Physics, McMaster University, Clemson University, Simon Fraser University, Westfälische Wilhelms-Universität Münster, University of Northern British Columbia (UNBC), Hebrew University Jerusalem

Journal

Journal of Physics G: Nuclear and Particle Physics

Band

35

Anzahl der Seiten

6

ISSN

0954-3899

DOI

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

Publikationsdatum

2008

Peer-reviewed

Ja

ÖFOS 2012

103005 Atomphysik

Link zum Portal

https://ucris.univie.ac.at/portal/de/publications/40ca44ti-and-the-production-of-44ti-in-supernovae(82d9b608-ca2d-4cc4-b903-207089fcacb3).html