Meteoritic evidence for two r-processes and the HEW scenario

Details Meteoritic evidence for two r-processes and the HEW scenario Meteoritic evidence for two r-processes and the HEW scenario

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008newar..52..396o&link_type=abstract

New Astronomy Reviews, Volume 52, Issue 7-10, p. 396-400.

Astronomy and Astrophysics

Astronomy

5

96.30.Za, 98.80.Ft, 26.30.Hj, 26.30.Jk, 97.60.Bw, 97.20.Wt

Scientific paper

The relative abundances of the radionuclides 129I and 182Hf in the Early Solar System (ESS) in conjunction with observations on extremely metal-poor stars have been interpreted as evidence for two distinct types (L and H events) of the r-process. In particular, it has been postulated that iodine is produced exclusively during L events, while barium and elements above are produced by H events only. In this context we explore predictions from the high entropy wind (HEW) model for the r-process. Within this scenario, the full expected entropy range produces abundances which are inconsistent with these postulates. Only by excluding the entropy range below a precisely defined value can Ba and elements above be produced without significant contributions to iodine. Achieving the required clear “cut” at always the exactly same entropy value would be remarkable; the cut may have been a characteristic of the last r-process contribution, however. Alternative explanations for a relative overabundance of 182Hf and/or a deficit of 129I in the Early Solar System include a late neutron burst contribution to 182Hf and a 129I deficit due to the volatile nature of the element iodine.

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