Calculations of Fission-Fragment Isotopic Yields

Abstract : Information of isotopic fission-fragment yields is important for both fundamental and applied nuclear physics. In the first applications of the Brownian shape motion (BSM) method fission fragment yields were obtained versus nucleon number A. Charge yields were obtained by obvious transformations assuming constant proton Z to neutron N ratios in the emerging fragments, identical to that of the compound nucleus. In these applications the method was implemented as a Metropolis random walk on five-dimensional (5D) potential-energy surfaces calculated on a discrete grid. The surfaces were functions of five nuclear shape degrees of freedom, namely elongation, spheroidal deformation of each of the nascent fragments, neck diameter, and left-right shape asymmetry. We envisioned that if we could devise a method to calculate these surfaces versus Z and N in the emerging fragments, rather than overall shape asymmetry, then a straightforward implementation of the standard BSM method as a random walk, now on 6D surfaces, would yield fragment distributions Y (Z, N) versus both neutron and proton numbers. Once the fragment identities can be taken into account, pairing effects arising from odd-odd or even-even nucleon divisions could also be introduced. We review the steps recently taken to obtain such surfaces and discuss some results.
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Communication dans un congrès
6th International Conference on Fission and Properties of Neutron Rich Nuclei, Nov 2016, Sanibel Island, United States. pp.538-546, 2017, 〈10.1142/9789813229426_0094〉
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Soumis le : jeudi 21 décembre 2017 - 01:07:30
Dernière modification le : jeudi 11 janvier 2018 - 02:09:35

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P. Möller, C. Schmitt. Calculations of Fission-Fragment Isotopic Yields. 6th International Conference on Fission and Properties of Neutron Rich Nuclei, Nov 2016, Sanibel Island, United States. pp.538-546, 2017, 〈10.1142/9789813229426_0094〉. 〈hal-01669830〉

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