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Project List » Systematic Study of Astrophysical Radiative Capture Reactions with Complete Reaction Mechanism and Up-to-date Nuclear Ingredients

Systematic Study of Astrophysical Radiative Capture Reactions with Complete Reaction Mechanism and Up-to-date Nuclear Ingredients
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Acronym: SSARCR
Contracting Authority: Institutul de Fizica Atomica (IFA)
Number / Date of the contract: 15/16.10.2020 / 2020-10-16
PN-III-P5/Subprogramul 5.1
Project Manager: Dr. Yi Xu
Partners: University of Bucharest
Starting date / finishing date: 2020-10-16 / 2023-10-15
Project value: 750000 RON
Abstract: Astrophysical reaction rate plays an essential role in many astrophysical processes, from the Big-Bang Nucleosynthesis (BBN) to the element production and energy generation in star evolution. To determine the reaction rate is the most important task in the field of nuclear astrophysics.
However, most astrophysical processes involve the reactions with unstable or even exotic nuclei and extreme low energies, which can hardly be realized experimentally. On the other hand, theoretical prediction becomes the unique way to fill the gaps. This project is a systematic and comprehensive research on the cross section and the astrophysical reaction rate for radiative capture reactions.
In particular, all the reaction mechanism including the direct capture, the resonance capture through discrete and continued compound states, and the associated pre-equilibrium capture will be simultaneously taken into account in the description of radiative capture reactions, and the reaction models with the corresponding computer codes considering all these three reaction mechanisms will be developed for the calculation of the cross sections and astrophysical reaction rates for the radiative capture reactions.
Furthermore, the up-to-date nuclear ingredients extracted not only from the compilations and evaluations of the available experimental data but also from the microscopic calculations will be consistently employed as the standard inputs to calculate the cross sections and astrophysical reaction rates for the radiative capture reactions.
Using the new developed reaction models and the extracted nuclear ingredients, the cross sections and astrophysical reaction rates for the radiative capture reactions with the targets beyond Oxygen will be systematically calculated, and the obtained results will be formatted into the standard data files and released via the online database for further astrophysical studies.
It is emphasized that, the considerations of (1) all the three kinds of reaction mechanisms and (2) the state-of-the-art nuclear ingredients in the radiative capture reactions readily ensure the reasonability and reliability of the calculated astrophysical reaction rates, which are expected to improve the study of astrophysical processes.

Objectives:
  • Develop the reaction model for direct capture and verify the Hauser-Feshbach and exciton models for resonance and pre-equilibrium
  • Develop the reaction model for the calculation of isolated resonance and integrate all reaction models
  • Determine the best model parameters from sensitivity studies and perform the systematic calculation of reaction rates


  • THE STAGES OF THE PROJECT AND DELIVERY DATES

    RESULTS
    PUBLISHED ARTICLES
    RESEARCH TEAM


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