The 40Ca(α,γ)44Ti reaction studied by activation


The 40Ca(α,γ)44Ti reaction studied by activation

Schmidt, K.; Akhmadaliev, C.; Anders, M.; Bemmerer, D.; Boretzky, K.; Caciolli, A.; Dietz, M.; Elekes, Z.; Fülöp, Z.; Gyürky, G.; Hannaske, R.; Junghans, A.; Marta, M.; Menzel, M.-L.; Schwengner, R.; Szücs, T.; Wagner, A.; Yakorev, D.; Zuber, K.

The radioactive nuclide 44Ti is believed to be produced in the alpha-rich freezeout preceding supernova explosions. The γ-lines from its decay have been observed in space-based gamma-observatories for the Cassiopeia A supernova remnant. The rates of the nuclear reactions governing the production and destruction of 44Ti should therefore be known with precision. Using the α-beam of the 3.3 MV Tandetron of Helmholtz-Zentrum Dresden-Rossendorf, the strengths of the 40Ca(α,γ)44Ti resonance triplet at 4.5 MeV α-energy have been restudied by activation. The samples have been analyzed in the Felsenkeller underground γ-counting facility. Preliminary data on lower-lying resonances will be presented, as well.

Keywords: 44Ti; supernova; space-based gamma-observatories; Cassiopeia A; 3.3 MV Tandetron; Felsenkeller; resonance strengths

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Publ.-Id: 18032