nu_rnet
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nu_rnet [2014/06/05 17:17] schutrumpg |
nu_rnet [2014/06/05 19:33] schutrumpg |
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| {{:core-collapse_figure.png?650|}} | {{:core-collapse_figure.png?650|}} | ||
| - | Fig. Schematic representation of the evolutionary stages from stellar core collapse. (Ref. H.Th. Janka, arXiv:astro-ph/0612072) | + | Fig: Schematic representation of the evolutionary stages from stellar core collapse. (Ref. H.Th. Janka, arXiv:astro-ph/0612072) |
| =====Method and aims:===== | =====Method and aims:===== | ||
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| ===Reaction Network=== | ===Reaction Network=== | ||
| - | Last but not least we need a reaction library. This was taken from the JINA Reaclib database. For the r-process only nucleides have to be considered which are stable or even more neutron rich. The proton rich nucleides can be neglected. In the chart of nuclei the considered rates look like this: | + | Last but not least we need a reaction library. This was taken from the JINA Reaclib database. For the r-process only nuclides have to be considered which are stable or even more neutron rich. The proton rich nuclides can be neglected. In the chart of nuclides the considered rates look like this: |
| {{ :nuclide_chart.jpg?650 |}} | {{ :nuclide_chart.jpg?650 |}} | ||
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| ====Results==== | ====Results==== | ||
| ==$Y_e=0.2$== | ==$Y_e=0.2$== | ||
| - | {{ :ev20.png?400 |}} | + | {{ :ev15.png?400 |}} |
| ==$Y_e=0.25$== | ==$Y_e=0.25$== | ||
| {{ :ev25.png?400 |}} | {{ :ev25.png?400 |}} | ||
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| {{ :ev40.png?400 |}} | {{ :ev40.png?400 |}} | ||
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| + | The preliminary results show the abundances of selected nuclides. The abundances are representative for the regions of magic neutron numbers 82 and 126. The abundances in these regions should be high. For $Y_e=0.15$ only small abundances for these nuclides are present, because the seed density consisting of almost the same number of protons and neutrons is too small. For $Y_e=0.25$ we see strong abundances of these nuclides, but for higher $Y_e>0.4$ the neutron density is too small. Thus neutron capure is too slow and the heavy elements cannot be built. | ||
nu_rnet.txt · Last modified: 2014/06/06 09:18 by schutrumpg
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