40Ca(α,γ)44Ti reaction in the energy regime of supernova nucleosynthesis

H. Nassar, M. Paul, I. Ahmad, Y. Ben-Dov, J. Caggiano, S. Ghelberg, S. Goriely, J.P. Greene, M. Hass, A. Heger, A. Heinz, D.J. Henderson, R.V.F. Janssens, C.L. Jiang, Y. Kashiv, B.S. Nara Singh, A. Ofan, R.C. Pardo, T. Pennington, K.E. RehmG. Savard, R. Scott, R. Vondrasek

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45 Citations (Scopus)


The 44Ti(t1/2=59 yr) nuclide, an important signature of supernova nucleosynthesis, has recently been observed as live radioactivity by
γ-ray astronomy from the Cas A remnant. We investigate in the laboratory the major 44Ti production reaction 40Ca(α,γ)44Ti (Ec.m.∼0.6–1.2 
MeV/u) by direct off-line counting of 44Ti nuclei. The yield, significantly higher than inferred from previous experiments, is analyzed in terms of a statistical model using microscopic nuclear inputs. The associated stellar rate has important astrophysical consequences, increasing the calculated supernova 44Ti yield by a factor ∼2 over previous estimates and bringing it closer to Cas A observations.
Original languageEnglish
Article number041102
Number of pages4
JournalPhysical Review Letters
Issue number4
Publication statusPublished - 3 Feb 2006
Externally publishedYes


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