# Co-production of light p-, s- and r-process isotopes in the high-entropy wind of type II supernovae

Source: [Co-production of light p-, s- and r-process isotopes in the high-entropy wind of type II supernovae](<https://www.sota2.com/research/paper/68fa2f071e209131ce868695>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-28T13:53:33.679Z

Authors: K. Farouqi, K.-L. Kratz, B. Pfeiffer

Published: 2009-06-05T09:30:47.000Z

## Abstract

We have performed large-scale nucleosynthesis calculations within the high-entropy-wind (HEW) scenario of type II supernovae. The primary aim was to constrain the conditions for the production of the classical "p-only" isotopes of the light trans-Fe elements. We find, however, that for electron fractions in the range 0.458 $\\le$ Y$\_e$ $\\le$ 0.478, sizeable abundances of p-, s- and r-process nuclei between $^{64}$Zn and $^{98}$Ru are coproduced in the HEW at low entropies (S $\\le$ 100) by a primary charged-particle process after an $\\alpha$-rich freezeout. With the above Y$\_e$ -- S correlation, most of the predicted isotopic abundance ratios within a given element (e.g. $^{64}$Zn(p)/$^{70}$Zn(r) or $^{92}$Mo(p)/$^{94}$Mo(p)), as well as of neighboring elements (e.g. $^{70}$Ge(s+p)/$^{74}$Se(p) or $^{74}$Se(p)/$^{78}$Kr(p)) agree with the observed Solar-System ratios. Taking the Mo isotopic chain as a particularly challenging example, we show that our HEW model can account for the production of all 7 stable isotopes, from "p-only" $^{92}$Mo, via "s-only" $^{96}$Mo up to "r-only" $^{100}$Mo. Furthermore, our model is able to reproduce the isotopic composition of Mo in presolar SiC X-grains.}

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/0906.1076>)

[PDF](<https://arxiv.org/pdf/0906.1076.pdf>)