Elsevier

Nuclear Physics A

Volume 284, Issue 1, 27 June 1977, Pages 163-176
Nuclear Physics A

Helium burning of 40Ca

https://doi.org/10.1016/0375-9474(77)90692-3Get rights and content

Abstract

The 40Ca(α, γ)44Ti reaction has been investigated in the astrophysically important energy region Eα = 2.75–4.00 MeV corresponding to T = 1.2 to 2.1 × 109 °K. Values for ωγ have been determined for the 12 isolated resonances observed in this region. Gamma-ray angular distributions taken at the 9 highest energy resonances have been used to determine the most likely Jπ values for the resonances and the multipolarity of the principal γ-ray transitions. The empirical energy averaged astrophysical reaction rate determined from these data is compared with the Hauser-Feshbach calculations of Woosley et al.

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      Citation Excerpt :

      Since the reaction 40Ca(α, γ)44Ti is the main process for the nucleosynthesis of 44Ti, it has a strong influence on the final 44Ti yield. This reaction was studied in the past by prompt γ-ray spectrometry in the energy range of Eα = 3.5–4.6 MeV [8] and Eα = 2.75–4.00 MeV [9], which correspond to stellar temperatures of T9 = 1.7–2.2 and T9 = 1.2–2.1, respectively (T9 = T/109 K). Resonance strengths were measured for 12 isolated narrow resonances.

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    Supported in part by NSF [PHY 76-02724] at Caltech.

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