Microscopic study of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">−</mml:mi></mml:mrow><mml:mrow /><mml:mrow><mml:mn>238</mml:mn></mml:mrow><mml:mrow /><mml:mrow /><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>238</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>U system and anomalous pair production

Jf, Berger; Jd, Anderson; Bonche, P.; Ms, Weiss

doi:10.1103/physrevc.41.r2483

Cited by 25 publications

(27 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Beyond this minimum, two kinds of valleys exist: the so-called fission valley, corresponding to one-body-shaped configurations, and the so-called fusion valley, corresponding to two separated fragments (see, for example, Refs. [33,34]). …”

Section: Resultsmentioning

confidence: 99%

“…Assuming axial symmetry, a limited number of shape degrees of freedom are retained, namely the elongation of the fissioning system expressed as the axial quadrupole moment Q 20 or the center-of-mass distance D c.m. between the (pre-)fragments, the mass asymmetry through either the axial octupole moment Q 30 or the heavy (pre-)fragment mass A H , and the neck coordinate Q N (introduced by Berger et al [33] and used by Warda et al [16]). Under this assumption, the center of mass of the fissioning nucleus, located on the symmetry axis chosen to be the z-axis, is fixed at the origin of the reference frame by adding to the Hamiltonian a constraint on the expectation value of z.…”

Section: Model and Methods For Exploring The Potential-energy Surfacementioning

confidence: 99%

See 1 more Smart Citation

Fission modes ofFm256andFm258in a microscopic app

Bonneau

2006

Phys. Rev. C

View full text Add to dashboard Cite

A static microscopic study of potential-energy surfaces within the Skyrme-Hartree-Fock-plus-BCS model is carried out for the 256 Fm and 258 Fm isotopes with the goal of deducing some properties of spontaneous fission. The calculated fission modes are found to be in agreement with the experimentaly observed asymmetric-to-symmetric transition in the fragment-mass distributions and with the high-and low-total-kinetic-energy modes experimentally observed in 258 Fm. Most of the results are similar to those obtained in macroscopic-microscopic models as well as in recent Hartree-FockBogolyubov calculations with the Gogny interaction, with a few differences in their interpretations. In particular an alternative explanation is proposed for the low-energy fission mode of 258 Fm.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Model and Methods For Exploring The Potential-energy Surfacementioning

confidence: 99%

Fission modes ofFm256andFm258in a microscopic app

Bonneau

2006

Phys. Rev. C

View full text Add to dashboard Cite

show abstract

“…The interaction used is the finite-range Gogny force with the D1S parametrization [73]. This interaction has been proven to successfully describe the fission process in heavy nuclei [69,74,76,77,[82][83][84][85][86][87]. The other Gogny forces developed recently-D1N [88] and D1M [89]-are discussed in Appendix B.…”

Section: Theorymentioning

confidence: 99%

“…We apply standard methods used in the theoretical description of nuclear fission which are well established in the literature [69][70][71][72][73][74][75][76][77]. We use the mean-field approximation in the Hartree-Fock-Bogoliubov (HFB) scheme with the finite-range Gogny force [78] to compute the nuclear wave functions.…”

Section: Introductionmentioning

confidence: 99%

Microscopic description of cluster radioactivity in actinide nuclei

2011

View full text Add to dashboard Cite

Cluster radioactivity is the emission of a fragment heavier than an α particle and lighter than mass 50. The range of clusters observed in experiments goes from 14 C to 32 Si while the heavy mass residue is always a nucleus in the neighborhood of the doubly-magic 208 Pb nucleus. Cluster radioactivity is described in this paper as very asymmetric nuclear fission. A new fission valley leading to a decay with large fragment mass asymmetry matching the cluster radioactivity products is found. The mass octupole moment is found to be more convenient than the standard quadrupole moment as the parameter driving the system to fission. The mean-field Hartree-Fock-Bogoliubov theory with the phenomenological Gogny interaction has been used to compute the cluster emission properties of a wide range of even-even actinide nuclei from 222 Ra to 242 Cm, where emission of the clusters has been experimentally observed. Computed half-lives for cluster emission are compared with experimental results. The noticeable agreement obtained between the predicted properties of cluster emission (namely, cluster masses and emission half-lives) and the measured data confirms the validity of the proposed methodology in the analysis of the phenomenon of cluster radioactivity. A continuous fission path through the scission point has been described using the neck parameter constraint.

show abstract

“…which gives an estimate of the number of particles in the region centered around the point z N [38,63,64]. We chose the range a N = 1.0 fm.…”

Section: B Skyrme Energy Functionalmentioning

confidence: 99%

Description of induced nuclear fission with Skyrme energy functionals: Static potential energy surfaces and fission fragment properties

et al. 2014

View full text Add to dashboard Cite

Eighty years after its experimental discovery, a description of induced nuclear fission based solely on the interactions between neutrons and protons and quantum many-body methods still poses formidable challenges. The goal of this paper is to contribute to the development of a predictive microscopic framework for the accurate calculation of static properties of fission fragments for hot fission and thermal or slow neutrons. To this end, we focus on the 239 Pu(n,f) reaction and employ nuclear density functional theory with Skyrme energy densities. Potential energy surfaces are computed at the Hartree-Fock-Bogoliubov approximation with up to five collective variables. We find that the triaxial degree of freedom plays an important role, both near the fission barrier and at scission. The impact of the parameterization of the Skyrme energy density and the role of pairing correlations on deformation properties from the ground-state up to scission are also quantified. We introduce a general template for the quantitative description of fission fragment properties. It is based on the careful analysis of scission configurations, using both advanced topological methods and recently proposed quantum many-body techniques. We conclude that an accurate prediction of fission fragment properties at low incident neutron energies, although technologically demanding, should be within the reach of current nuclear density functional theory.

show abstract

Microscopic study of the−238238U system and anomalous pair production

Cited by 25 publications

References 11 publications

Fission modes ofFm256andFm258in a microscopic app

Fission modes ofFm256andFm258in a microscopic app

Microscopic description of cluster radioactivity in actinide nuclei

Description of induced nuclear fission with Skyrme energy functionals: Static potential energy surfaces and fission fragment properties

Contact Info

Product

Resources

About