Origin of anomalous Xe-H in nanodiamond stardust

K. L. Kratz, K. Farouqi, O. Hallmann, B. Pfeiffer, U. Ott

Research output: Conference contribution

3 Citations (Scopus)

Abstract

Still today, the nucleosynthesis origin of Xe-H in presolar nanodiamonds is far from understood. Historically possible explanations were proposed by a secondary "neutron-burst" process occurring in the He- or C/O-shells of a type-II supernova (SN-II), which are, however, not fully convincing in terms of modern nucleosynthesis conditions. Therefore, we have investigated Xe isotopic abundance features that may be diagnostic for different versions of a classical, primary r-process in high-entropy-wind (HEW) ejecta of core-collapse SN-II. We report here on parameter tests for non-standard r-process variants, by varying electron abundances (Ye), ranges of entropies (S) and expansion velocities (Vexp) with their correlated neutron-freezeout times (τ(freeze)) and temperatures (T9(freeze)). From this study, we conclude that a best fi to the measured Xe-H abundance ratios iXe/136Xe can be obtained with the high-S "main" component of a "cold" r-process variant.

Original languageEnglish
Title of host publicationSeventh European Summer School on Experimental Nuclear Astrophysics - Proceedings of the 7th European Summer School on Experimental Nuclear Astrophysics
PublisherAmerican Institute of Physics Inc.
Pages62-68
Number of pages7
ISBN (Print)9780735412293
DOIs
Publication statusPublished - jan. 1 2014
Event7th European Summer School on Experimental Nuclear Astrophysics - Sicily, Italy
Duration: szept. 15 2013szept. 27 2013

Publication series

NameAIP Conference Proceedings
Volume1595
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other7th European Summer School on Experimental Nuclear Astrophysics
CountryItaly
CitySicily
Period9/15/139/27/13

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Kratz, K. L., Farouqi, K., Hallmann, O., Pfeiffer, B., & Ott, U. (2014). Origin of anomalous Xe-H in nanodiamond stardust. In Seventh European Summer School on Experimental Nuclear Astrophysics - Proceedings of the 7th European Summer School on Experimental Nuclear Astrophysics (pp. 62-68). (AIP Conference Proceedings; Vol. 1595). American Institute of Physics Inc.. https://doi.org/10.1063/1.4875291