Fission of doubly even actinide nuclei induced by direct reactions

Back, B. B.; Hansén, O.; Britt, H. C.; Garrett, J.D.

doi:10.1103/physrevc.9.1924

Cited by 184 publications

(101 citation statements)

References 37 publications

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“…For a long time Z = 99 as been the upper limit for reasonably accurate experimental fission-barrier parameters [54][55][56][57]. Only recently has a barrier height for a heavier system, 274 Hs, been determined [58].…”

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confidence: 99%

Fission barriers at the end of the chart of the nuclides

et al. 2015

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We present calculated fission-barrier heights for 5239 nuclides, for all nuclei between the proton and neutron drip lines with 171 ≤ A ≤ 330. The barriers are calculated in the macroscopicmicroscopic finite-range liquid-drop model (FRLDM) with a 2002 set of macroscopic-model parameters. The saddle-point energies are determined from potential-energy surfaces based on more than five million different shapes, defined by five deformation parameters in the threequadratic-surface shape parameterization: elongation, neck diameter, left-fragment spheroidal deformation, right-fragment spheroidal deformation, and nascent-fragment mass asymmetry. The energy of the ground state is determined by calculating the lowest-energy configuration in both the Nilsson perturbed-spheroid (ǫ) and in the spherical-harmonic (β) parameterizations, including axially asymmetric deformations. The lower of the two results (correcting for zero-point motion) is defined as the ground-state energy. The effect of axial asymmetry on the inner barrier peak is calculated in the (ǫ, γ) parameterization. We have earlier benchmarked our calculated barrier heights to experimentally extracted barrier parameters and found average agreement to about one MeV for known data across the nuclear chart. Here we do additional benchmarks and investigate the qualitative, and when possible, quantitative agreement and/or consistency with data on β-delayed fission, isotope generation along prompt-neutron-capture chains in nuclear-weapons tests, and superheavy-element stability. These studies all indicate that the model is realistic at considerable distances in Z and N from the region of nuclei where its parameters were determined.

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confidence: 99%

Fission barriers at the end of the chart of the nuclides

et al. 2015

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“…The heights of the barrier are calculated by subtracting the zero point vibration energy from the value of the deformation energy in the transient configuration E A(B) = V A(B) − E V 0 . Values found in the literature for the heights of the barriers obtained from various data evaluations [2,3,[28][29][30] are also displayed. It can be observed that even between the evaluations concerning the same isotopes differences of 0.5 MeV can appear.…”

Section: Resultsmentioning

confidence: 99%

Th and U fission barriers within the Woods-Saxon two center shell model

Mirea¹,

Tassan‐Got²

2010

Open Physics

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Abstract:Fission barriers of actinides are calculated in the framework of the macroscopic-microscopic method. The single particle energies are obtained within a new version of the Woods-Saxon two-center shell model. A nuclear shape parametrization characterized by five degrees of freedom is used. The barriers are calculated along the minimal action trajectory in the configuration space and the inertia is evaluated within the cranking formalism. The reliability of the model is tested by comparing the theoretical results with values deduced from experimental data.PACS (

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“…This is equivalent to state that final results are not sensitive to the actual entrance spin-parity probability distribution although many prospective calculations, spread over four decades (already in Ref. [8]), have shown that distribution patterns are strongly spin-parity reaction dependent and this, at least for nucleus excitation energies up to (S n + 2) MeV.…”

Section: Monte Carlo Simulationsmentioning

confidence: 99%

“…However a refined analytical formulation of the fission channel, allowed also by our code, can illustrate our purpose. This calculates as (8) where are respectively the individual CN fission decay probability over given Aage Bohr [1] transition channel μ and appropriate class-II compound nucleus state WFCF; the behavior and the effect of latter being detailed in [5].…”

Section: Monte Carlo Simulationsmentioning

confidence: 99%

Monte Carlo simulation of transfer reactions using extended R-matrix theory picturing surrogate-type WFCF features

Bouland

2016

EPJ Web of Conferences

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Abstract. This article supplies an overview of issues related to the interpretation of surrogate measurement results for neutron-incident cross section predictions; difficulties that are somehow masked by the historical conversion route based on Weisskopf-Ewing approximation. Our proposal is to handle the various difficulties by using a more rigorous approach relying on Monte Carlo simulation of transfer reactions with extended R-matrix theory. The multiple deficiencies of the historical surrogate treatment are recalled but only one is examined in some details here; meaning the calculation of in-out-going channel Width Fluctuation Correction Factors (WFCF) which behavior witness partly the failure of Niels Bohr's compound nucleus theoretical landmark. Relevant WFCF calculations according to neutron-induced surrogate-and cross section-types as a function of neutron-induced fluctuating energy range [0 -2.1 MeV] are presented and commented in the case of the 240 Pu * and 241 Pu * compound nucleus isotopes.

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Fission of doubly even actinide nuclei induced by direct reactions

Cited by 184 publications

References 37 publications

Fission barriers at the end of the chart of the nuclides

Fission barriers at the end of the chart of the nuclides

Th and U fission barriers within the Woods-Saxon two center shell model

Monte Carlo simulation of transfer reactions using extended R-matrix theory picturing surrogate-type WFCF features

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