2009/01/01 by K. Farouqi, K. -L. Kratz, Karl Kratz +1 · 2 citations
Chemistry · Physics and Astronomy · #Analytical Chemistry (journal) #Astro and Planetary Science #Astronomical and nuclear sciences #Astrophysics #Atomic physics #Chemistry #Electron #Electron capture #Isotope #Nuclear physics #Nuclear physics research studies #Nucleosynthesis #Physics #Supernova #astro-ph.SR
paper · pdf · doi:10.1071/as08075
10 pages, 2 figures
openalex publication_date 2009/01/01 · arxiv created 2009/06/05 · arxiv updated 2015/05/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 ≤ Y e ≤ 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 ≤ 100) by a primary charged-particle process after an α -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.