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The Impact of Fission on R-Process Calculations

Eichler, M. ; Arcones, A. ; Käppeli, R. ; Korobkin, O. ; Liebendörfer, M. ; Martinez-Pinedo, G. ; Panov, I. V. ; Rauscher, T. ; Rosswog, S. ; Thielemann, F.-K. ; Winteler, C. (2016)
The Impact of Fission on R-Process Calculations.
In: Journal of Physics: Conference Series, 665
doi: 10.1088/1742-6596/665/1/012054
Article, Bibliographie

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Abstract

We have performed r-process calculations in neutron star mergers (NSM) and jets of magnetohydrodynamically driven (MHD) supernovae. In these very neutron-rich environments the fission model of heavy nuclei has an impact on the shape of the final abundance distribution and the second r-process peak in particular. We have studied the effect of different fission fragment mass distribution models in calculations of low-Yₑ ejecta, ranging from a simple parametrization to extensive statistical treatments (ABLA07). The r-process path ends when it reaches an area in the nuclear chart where fission dominates over further neutron captures. The position of this point is determined by the fission barriers and the neutron separation energies of the nuclei involved. As these values both depend on the choice of the nuclear mass model, so does the r-process path. Here we present calculations using the FRDM (Finite Range Droplet Model) and the ETFSI (Extended Thomas Fermi with Strutinsky Integral) mass model with the related TF and ETFSI fission barrier predictions. Utilizing sophisticated fission fragment distribution leads to a highly improved abundance distribution.

Item Type: Article
Erschienen: 2016
Creators: Eichler, M. ; Arcones, A. ; Käppeli, R. ; Korobkin, O. ; Liebendörfer, M. ; Martinez-Pinedo, G. ; Panov, I. V. ; Rauscher, T. ; Rosswog, S. ; Thielemann, F.-K. ; Winteler, C.
Type of entry: Bibliographie
Title: The Impact of Fission on R-Process Calculations
Language: English
Date: 5 January 2016
Place of Publication: Bristol
Publisher: IOP Publishing
Journal or Publication Title: Journal of Physics: Conference Series
Volume of the journal: 665
Collation: 6 Seiten
DOI: 10.1088/1742-6596/665/1/012054
Corresponding Links:
Abstract:

We have performed r-process calculations in neutron star mergers (NSM) and jets of magnetohydrodynamically driven (MHD) supernovae. In these very neutron-rich environments the fission model of heavy nuclei has an impact on the shape of the final abundance distribution and the second r-process peak in particular. We have studied the effect of different fission fragment mass distribution models in calculations of low-Yₑ ejecta, ranging from a simple parametrization to extensive statistical treatments (ABLA07). The r-process path ends when it reaches an area in the nuclear chart where fission dominates over further neutron captures. The position of this point is determined by the fission barriers and the neutron separation energies of the nuclei involved. As these values both depend on the choice of the nuclear mass model, so does the r-process path. Here we present calculations using the FRDM (Finite Range Droplet Model) and the ETFSI (Extended Thomas Fermi with Strutinsky Integral) mass model with the related TF and ETFSI fission barrier predictions. Utilizing sophisticated fission fragment distribution leads to a highly improved abundance distribution.

Identification Number: Artikel-ID: 012054
Additional Information:

Erstveröffentlichung; Nuclear Physics in Astrophysics VI (NPA6) 19.-24.05. 2013, Lisbon, Portugal

Classification DDC: 500 Science and mathematics > 530 Physics
Divisions: 05 Department of Physics
05 Department of Physics > Institute of Nuclear Physics
Date Deposited: 21 May 2024 07:58
Last Modified: 21 May 2024 07:58
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