The 40Ca(alpha,gamma)44Ti reaction in the energy regime of supernova nucleosynthesis

Details The 40Ca(alpha,gamma)44Ti reaction in the energy regime of supernova nucleosynthesis The 40Ca(alpha,gamma)44Ti reaction in the energy regime of supernova nucleosynthesis

2005-09-03

arxiv.org/abs/nucl-ex/0509006v2

Phys.Rev.Lett. 96 (2006) 041102

Physics

Nuclear Physics

Nuclear Experiment

To be published in Phys. Rev. lett., 4 pages, 1 table, 2 figures

Scientific paper

10.1103/PhysRevLett.96.041102

The 44Ti(t1/2 = 59 y) nuclide, an important signature of supernova nucleosynthesis, has recently been observed as live radioactivity by gamma-ray astronomy from the Cas A remnant. We investigate in the laboratory the major 44Ti production reaction, 40Ca(alpha,gamma)44Ti (E_cm = 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.

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