تقرير
Neutrino Nucleosynthesis of radioactive nuclei in supernovae
| العنوان: | Neutrino Nucleosynthesis of radioactive nuclei in supernovae |
|---|---|
| المؤلفون: | Sieverding, A., Huther, L., Langanke, K., Martínez-Pinedo, G., Heger, A. |
| سنة النشر: | 2015 |
| المجموعة: | Astrophysics Nuclear Theory |
| مصطلحات موضوعية: | Astrophysics - High Energy Astrophysical Phenomena, Nuclear Theory |
| الوصف: | We study the neutrino-induced production of nuclides in explosive supernova nucleosynthesis for progenitor stars with solar metallicity and initial main sequence masses between 15 M$_\odot$ and 40 M$_\odot$. We improve previous investigations i) by using a global set of partial differential cross sections for neutrino-induced charged- and neutral-current reactions on nuclei with charge numbers $Z < 76 $ and ii) by considering modern supernova neutrino spectra which have substantially lower average energies compared to those previously adopted in neutrino nucleosynthesis studies. We confirm the production of $^7$Li, $^{11}$B, $^{138}$La, and $^{180}$Ta by neutrino nucleosynthesis, albeit at slightly smaller abundances due to the changed neutrino spectra. We find that for stars with a mass smaller than 20 M$_\odot$, $^{19}$F is produced mainly by explosive nucleosynthesis while for higher mass stars it is produced by the $\nu$ process. We also find that neutrino-induced reactions, either directly or indirectly by providing an enhanced abundance of light particles, noticeably contribute to the production of the radioactive nuclides $^{22}$Na and $^{26}$Al. Both nuclei are prime candidates for gamma-ray astronomy. Other prime targets, $^{44}$Ti and $^{60}$Fe, however, are insignificantly produced by neutrino-induced reactions. We also find a large increase in the production of the long-lived nuclei $^{92}$Nb and $^{98}$Tc due to charged-current neutrino capture. Comment: 6 pages, 2 figures, 2 tables |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/1505.01082 |
| رقم الأكسشن: | edsarx.1505.01082 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |