Origin of the p-Nuclei in Explosive Nucleosynthesis

T. Rauscher

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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A number of naturally occurring, proton-rich nuclides (the p-nuclei) cannot be made in the s- and r-process. It has been found that massive stars can produce p-nuclei through photodisintegration of pre-existing intermediate and heavy nuclei. This so-called gamma-process requires sufficiently high temperatures and occurs in pre-explosive or explosive O/Ne burning, depending on the mass of
the star. Although the gamma-process has been successful in producing a large range of p-nuclei, two mass regions remain problematic, A < 110 and 150 < A < 165, where a number of p-nuclei are severely underproduced. The origin of the problems is yet to be identified. A large number of unstable nuclei with only theoretically predicted reaction rates are included in the reaction network and thus the nuclear input may involve uncertainties. Deficiencies in charged-particle
optical potentials at gamma-process temperatures have been found for nuclei at stability. On the other hand, the gamma-process conditions (temperature profiles, entropy of the O shell, seed composition) also sensitively depend on details of the stellar structure and evolution, as well as on the initial
metallicity. Nevertheless, especially the deficient low-mass p-nuclei may call for an additional production process or site, such as production in (subChandrasekhar) type Ia supernovae. Also the (im)possibility of a synthesis in the rp- and nu-p-processes is discussed. Were this the case, the production of p-nuclei would be realized as a superposition of several different processes, not
necessarily in the same site.
Original languageEnglish
Title of host publicationProcs 11th Symposium on Nuclei in the Cosmos (NIC XI)
Number of pages10
Publication statusPublished - Jan 2011
Event11th Symposium on Nuclei in the Cosmos - Heidelberg, Germany
Duration: 19 Jul 201023 Jul 2010

Publication series

NameProceedings of Science
ISSN (Electronic)1824-8039


Conference11th Symposium on Nuclei in the Cosmos


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