Fission properties for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>r</mml:mi></mml:math>-process nuclei

Erler, J.; Langanke, K.; Loens, H. P.; Martı́nez-Pinedo, G.; Reinhard, P.‐G.

doi:10.1103/physrevc.85.025802

Cited by 102 publications

(122 citation statements)

References 75 publications

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“…These include both fission barriers and collective inertial masses. Recent global calculations [81][82][83] have mainly focussed on the description of fission barriers neglecting the important role of collective masses that are normally described using a simple phenomenological prescription [84] in rprocess applications. Furthermore, it is important to address the impact of dynamical versus static descriptions of fission observables [85,86] Beta-decay half-lives have not been consistently computed with the mass models explored in this work.…”

Section: Discussionmentioning

confidence: 99%

Nuclear robustness of therprocess in neutron-star mergers

et al. 2015

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We have performed r-process calculations for matter ejected dynamically in neutron star mergers based on a complete set of trajectories from a three-dimensional relativistic smoothed particle hydrodynamic simulation with a total ejected mass of ∼ 1.7 × 10 −3 M . Our calculations consider an extended nuclear network, including spontaneous, β-and neutron-induced fission and adopting fission yield distributions from the ABLA code. In particular we have studied the sensitivity of the r-process abundances to nuclear masses by using different models. Most of the trajectories, corresponding to 90% of the ejected mass, follow a relatively slow expansion allowing for all neutrons to be captured. The resulting abundances are very similar to each other and reproduce the general features of the observed r-process abundance (the second and third peaks, the rare-earth peak and the lead peak) for all mass models as they are mainly determined by the fission yields. We find distinct differences in the predictions of the mass models at and just above the third peak, which can be traced back to different predictions of neutron separation energies for r-process nuclei around neutron number N = 130. In all simulations, we find that the second peak around A ∼ 130 is produced by the fission yields of the material that piles up in nuclei with A 250 due to the substantially longer beta-decay half-lives found in this region. The third peak around A ∼ 195 is generated in a competition between neutron captures and β decays during r-process freeze-out. The remaining trajectories, which contribute 10% by mass to the total integrated abundances, follow such a fast expansion that the r process does not use all the neutrons. This also leads to a larger variation of abundances among trajectories as fission does not dominate the r-process dynamics. The resulting abundances are in between those associated to the r and s processes. The total integrated abundances are dominated by contributions from the slow abundances and hence reproduce the general features of the observed r-process abundances. We find that at timescales of weeks relevant for kilonova light curve calculations, the abundance of actinides is larger than the one of lanthanides. This means that actinides can be even more important than lanthanides to determine the photon opacities under kilonova conditions. Moreover, we confirm that the amount of unused neutrons may be large enough to give rise to another observational signature powered by their decay.

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Section: Discussionmentioning

confidence: 99%

Nuclear robustness of therprocess in neutron-star mergers

et al. 2015

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“…This is the energy directly from a quadrupole constraint SHF calculation. The collective fission dynamics employs the PES corrected by ZPE [78,50]. The pattern for the corrected PES are very similar to those for the raw PES and thus we have skipped this extra panel.…”

Section: Choice Of Fit Observables and Force Parametersmentioning

confidence: 99%

“…The pattern for the corrected PES are very similar to those for the raw PES and thus we have skipped this extra panel. The mass parameter is obtained by self-consistent cranking, also called ATDHF cranking [78,50]. All three quantities are shown together with the extrapolation uncertainties from χ 2 analysis (see section 4.2) drawn as error bars.…”

Section: Choice Of Fit Observables and Force Parametersmentioning

confidence: 99%

“…The rather involved calculations of barriers and the fission HLs of SH elements on a global scale were possible and done only since very recently (see e.g., [31,50,25]). The goal of the present section is to recalculate the results of previous estimates for HLs taking into account two facts: First, as it was mentioned in many places (see e.g., [51,52] where the rotational moment of inertia -a part of inertia tensor -is discussed), the Inglis cranking mass is too small in comparison to the full ATDHFB one.…”

Section: Skyrme Type Functionalmentioning

confidence: 99%

“…Thus we start with a quick glance at uncertainties for the present test case, fission of 266 Hs. Figure 14 shows the ingredients for a fission calculation, potential-energy surface (PES), zero-point energy (ZPE) and mass parameter, all for motion along axially symmetric quadrupole deformation expressed as the dimension-less q ≡ β 2 (for details of the collective picture behind see, e.g., [78,50]). The figure label indicates "raw PES".…”

Section: Choice Of Fit Observables and Force Parametersmentioning

confidence: 99%

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Fission barriers and probabilities of spontaneous fission for elements with Z≥ 100

et al. 2015

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This is a short review of methods and results of calculations of fission barriers and fission halflives of even-even superheavy nuclei. An approvable agreement of the following approaches is shown and discussed: The macroscopic-microscopic approach based on the stratagem of the shell correction to the liquid drop model and a vantage point of microscopic energy density functionals of Skyrme and Gogny type selfconsistently calculated within Hartree-Fock-Bogoliubov method. Mass parameters are calculated in the Hartree-Fock-Bogoliubov cranking approximation. A short part of the paper is devoted to the nuclear fission dynamics. We also discuss the predictive power of Skyrme functionals applied to key properties of the fission path of 266 Hs. It applies the standard techniques of error estimates in the framework of a χ 2 analysis.

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