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The 40Ca(alpha,gamma)44Ti reaction is believed to be the main productionchannel for the radioactive nuclide 44Ti in core-collapse supernovae. Radiationfrom decaying 44Ti has been observed so far for two supernova remnants, and aprecise knowledge of the 44Ti production rate may help improve supernovamodels. The 40Ca(alpha,gamma)44Ti astrophysical reaction rate is determined bya number of narrow resonances. Here, the resonance triplet at E_alpha = 4497,4510, and 4523 keV is studied both by activation, using an undergroundlaboratory for the gamma counting, and by in-beam gamma spectrometry. Thetarget properties are determined by elastic recoil detection analysis and bynuclear reactions. The strengths of the three resonances are determined toomega gamma = (0.92+-0.20), (6.2+-0.5), and (1.32+-0.24) eV, respectively, afactor of two more precise than before. The strengths of this resonance tripletmay be used in future works as a point of reference. In addition, the presentnew data directly affect the astrophysical reaction rate at relatively hightemperatures, above 3.5 GK.

The resonance triplet at E_alpha = 4.5 MeV in the 40Ca(alpha,gamma)44Ti reaction