The r-Process in Metal Poor Stars and Black Hole Formation

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Nucleosynthesis of heavy nuclei in metal-poor stars is generally ascribed to the r-process, as the abundance pattern in many such stars agrees with the inferred Solar r-process abundances. Nonetheless, a significant number of these stars do not share this r-process template. they suggest that many such stars have begun an r-process, but it was prevented from running to completion in more massive stars by collapse to black holes, creating a 'truncated r-process,' or 'tr-process'. The observed fraction of tr-process stars is found to be consistent with expectations from the initial mass function (IMF), and they suggest that an apparent sharp ... continued below

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Boyd, R N; Famiano, M A; Meyer, B S; Motizuki, Y; Kajino, T & Roederer, I U November 30, 2011.

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Nucleosynthesis of heavy nuclei in metal-poor stars is generally ascribed to the r-process, as the abundance pattern in many such stars agrees with the inferred Solar r-process abundances. Nonetheless, a significant number of these stars do not share this r-process template. they suggest that many such stars have begun an r-process, but it was prevented from running to completion in more massive stars by collapse to black holes, creating a 'truncated r-process,' or 'tr-process'. The observed fraction of tr-process stars is found to be consistent with expectations from the initial mass function (IMF), and they suggest that an apparent sharp truncation observed at around mass 160 could result from a combination of collapses to black holes and the difficulty of observing the higher mass rare earths. They test the tr-process hypothesis with calculations that are terminated before all r-process trajectories have been ejected. These produce qualitative agreement with observation when both black hole collapse and observational realities are taken into account.

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PDF-file: 8 pages; size: 0.9 Mbytes

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  • Presented at: Origin of Matter and Evolution of Galaxies 11, Wako-shi, Japan, Nov 14 - Nov 17, 2011

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  • Report No.: LLNL-PROC-519280
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 1034139
  • Archival Resource Key: ark:/67531/metadc829307

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • November 30, 2011

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  • May 19, 2016, 3:16 p.m.

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  • Dec. 1, 2016, 12:55 p.m.

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Boyd, R N; Famiano, M A; Meyer, B S; Motizuki, Y; Kajino, T & Roederer, I U. The r-Process in Metal Poor Stars and Black Hole Formation, article, November 30, 2011; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc829307/: accessed May 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.