Counting44Ti nuclei from the40Ca(α,γ )44Ti reaction

M. Paul, C. Feldstein, I. Ahmad, D. Berkovits, C. Bordeanu, J. Caggiano, S. Ghelberg, J. Goerres, J. Greene, M. Hass, A. Heinz, D. Henderson, Susanta K Hui, R. V.F. Janssens, C. L. Jiang, S. Jiang, Y. Nirel, R. C. Pardo, T. Pennington, K. E. RehmG. Savard, G. Verri, R. Vondrasek, I. Weidenhover, M. Wiescher

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


Among the many production and destruction nuclear reactions that bear on the net44Ti yield in the supernova environment, recently highlighted by γ-ray astronomy observations, the α capture on40Ca stands out in the α-rich freezeout phase conjectured by astrophysical models. We activate a He-gas target, with a40Ca beam and implant recoiling44Ti nuclei (∼106) in a Cu catcher. The44Ti atoms chemically extracted with anatTi carrier are counted by accelerator mass spectrometry (AMS). The measurement of the44Ti/Ti ratio, together with the amount, of Ti carrier added, determine the number of44Ti nuclei produced in the activation, independent, of chemical yield or transmission efficiency. The resonance strength (7.4±2.5 eV) at Ecm∼1.1 MeV/n determined for two close-by levels of44Ti is in excellent agreement, with previous prompt-γ measurements. We plan to extend our experiments to the lower energy range.

Original languageEnglish (US)
Pages (from-to)239-242
Number of pages4
JournalNuclear Physics A
Issue number1-2
StatePublished - Jul 28 2003


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