Heidelberg 2015 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 6: Posters

MS 6.13: Poster

Dienstag, 24. März 2015, 17:00–19:00, C/Foyer

Measurement of the ¹⁴⁴Sm(α,γ)¹⁴⁸Gd reaction cross section using Accelerator Mass Spectrometry — •P. Scholz, A. Dewald, S. Heinze, C. Müller-Gatermann, L. Netterdon, and A. Zilges — Institute for Nuclear Physics, University of Cologne

The extinct p process nuclide ¹⁴⁶Sm serves as an astrophysical and geochemical chronometer through measurements of isotopic anomalies of its α-decay daughter ¹⁴²Nd. Hence, it serves as a clock for determining the chronology of solar-system formation and planetary differentiation. For this, the half-life of ¹⁴⁶Sm as well as the initial ratio of (¹⁴⁴Sm/¹⁴⁶Sm) has to be known very precisely. The initial isotopic ratio after p-process nucleosynthesis is still very unclear. Determining cross sections of reactions producing ¹⁴⁴Sm or ¹⁴⁶Sm would put predictions leading to p-process abundances on a more reliable basis. Although the very challenging ¹⁴⁴Sm(α,γ)¹⁴⁸Gd reaction was measured before [1], the results are heavily debated for methodical reasons. In a new approach, enriched ¹⁴⁴Sm-targets activated by high-intense α-particle beam will be analyzed for their content of ¹⁴⁸Gd via Accelerator Mass Spectrometry at CologneAMS. General ideas for isobaric suppression and normalization procedures as well as the different experimental setups will be presented.

Supported by the ULDETIS project within the UoC Excellence Initiative institutional strategy.
[1] E. Somorjai et al. Astron. Astrophys. 333, 1112-1116, 1998.