High resolution fission probabilities for 229, 230, 232Th(d pf) and 233, 236U(d, pf) reactions

Blons, J.; Fabbro, B.; Mazur, C.; Paya, D.; Ribrag, M.; Patin, Y.

doi:10.1016/0375-9474(88)90320-x

Cited by 65 publications

(41 citation statements)

References 9 publications

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“…Further complicating the situation is that different evaluations (of different sets of experimental data, and/or just using different cross-section Saddle-Energy Difference models) often lead to different results for the extracted barrier parameters. For example Blons and collaborators [40] consistently find that the so called "third minima" of some light actinide nuclei are very shallow and no more than 0.5 MeV or so below the surrounding second and third barrier peaks, which are about 6 MeV above the ground-state minimum, in good agreement with results obtained in our current model [41]. In contrast, Csige and collaborators [42][43][44] find third minima for nuclei in this region that are up to 3 MeV below the surrounding peaks.…”

Section: Resultsmentioning

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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Section: Resultsmentioning

confidence: 99%

Fission barriers at the end of the chart of the nuclides

et al. 2015

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“…The analysis of the transmission probability of resonances in prompt fission induced by γ or light particles has suggested the existence of even more deformed isomeric states called hyper-deformed (hd). Such third minima were discovered in [230][231][232][233] Th [4][5][6][7][8][9], 232,234,236 U, and 232 Pa nuclei [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…for ultradeformed isomers) visible in some PESs (figs. [6][7][8][10][11][12] are not shown here. Where available, our predictions are compared with the experimental data [56,54].…”

Section: Electric Quadrupole Momentsmentioning

confidence: 99%

On possible shape isomers in the Pt-Ra region of nuclei

Nerlo-Pomorska

Pomorski

Bartel³

et al. 2017

Eur. Phys. J. A

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Abstract.A certain number of yet unknown super-and hyper-deformed shape isomeric states are predicted in even-even nuclei of the region between Pt and Ra, using the macroscopic-microscopic model based on the Lublin Strasbourg Drop for the macroscopic energy and shell plus pairing corrections evaluated through the Yukawa-folded mean-field potential for the microscopic part. A new, rapidly converging shape parametrization is used to describe the vast range of nuclear deformations between the ground and the fission isomeric states up to near the scission configuration. Quadrupole moments are evaluated in the local minima and turn out to be in good agreement with the experimental data wherever available.

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“…14 . The low energy part of the spectrum, w x which we analyzed before 14 , is compared to the w x one published by Blons et al 15 in Fig. 2.…”

mentioning

confidence: 99%

“…The excited states in the third minimum of several w x Th isotopes were investigated by Blons et al 15 by measuring the micro-structure of sub-barrier fission resonances, but until now there is no experimental information available for the depth of the third minimum.…”

mentioning

confidence: 99%