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sruthisupriya
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could anyone explain p-process in nucleosynthesis for me? i didnt find any suitable site.
sruthisupriya said:could anyone explain p-process in nucleosynthesis for me? i didnt find any suitable site.
http://www.daviddarling.info/encyclopedia/P/p-process.htmlA type of nuclear reaction thought to occur in the early stages of a supernova explosion that results in the formation of certain neutron-deficient isotopes of elements from krypton to zirconium. It involves the capture of protons by nuclei previously formed by the r-process and the s-process.
The nucleosynthetic origin of the rare proton-rich isotopes, usually called 'p-process' isotopes, is examined. A particularly interesting context for this synthesis is found to be explosive events characterized by peak temperatures in the range from 2 to 3 billion K. At these temperatures a series of photodisintegration reactions operating upon a distribution of r- and s-process seeds produces an abundance pattern that displays striking similarities to that of the p-process nuclei in the solar system. The large proton densities usually required for such synthesis are not needed. Requisite conditions for this model are expected to occur naturally in those zones of supernovae that have experienced helium and perhaps carbon burning prior to explosion. Implications for supernova structure, presupernova evolution, and cosmochronology are discussed, and a critical discussion of other current p-process models is presented.
The p-process, also known as the proton capture process, is a type of nucleosynthesis that occurs in the outer layers of massive stars. It involves the capture of protons by heavy nuclei, resulting in the formation of heavier elements.
The p-process is responsible for the production of about half of the elements heavier than iron in the universe. This includes elements such as gold, platinum, and uranium.
The p-process requires extremely high temperatures and densities, which are found in the outer layers of massive stars during their late stages of evolution. It also requires a high abundance of free protons.
The key reactions involved in the p-process include proton capture, photo-disintegration, and beta decay. These reactions result in the sequential addition of protons to heavy nuclei, creating new, heavier elements.
The p-process differs from other nucleosynthesis processes such as the s-process and r-process in terms of the elements produced and the conditions required. While the s-process and r-process mostly occur in low-mass stars and supernovae, the p-process mainly occurs in massive stars. Additionally, the p-process produces elements with higher atomic numbers compared to the other processes.