Fission product yeilds from 6-9 MeV neutron-induced fission of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">U</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>235</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">U</

Chapman, T.C.; Anzelon, G.; Spitale, Guy C.; Nethaway, D.R.

doi:10.1103/physrevc.17.1089

Cited by 33 publications

(28 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At E n = 8 MeV, there exist two data-sets from different experiments. The GEF prediction is close to the symmetric data of Glendenin et al [194] but higher than the data from Chapman et al [201]. This is in line with an analysis reported in [193], where comparisons were made with the Ford experimental data [198] which are consis- [194,198,199] tent with the Glendenin data, according to which the Chapman data seem to systematically underestimate the symmetric part.…”

Section: Andsupporting

confidence: 80%

“…Electromagnetic-induced fission of relativistic secondary beams covers the transition from asymmetric to symmetric fission around mass 226 [69]. A pronounced fine structure close to symmetry appears in 201 Tl [70] and in 180 Hg [71]. It is difficult to observe low-energy fission in this mass range.…”

Section: Empirical Fragment Shellsmentioning

confidence: 99%

“…It is difficult to observe low-energy fission in this mass range. Thus, 201 Tl could only be measured down to 7.3 MeV above the fission barrier due to its low fissility, which explains the filling of the minimum between the two peaks. Only some neutron-deficient nuclei in the vicinity of 180 Hg were measured at energies close to the barrier after beta decay.…”

Section: Empirical Fragment Shellsmentioning

confidence: 99%

“…Only some neutron-deficient nuclei in the vicinity of 180 Hg were measured at energies close to the barrier after beta decay. Considering the measured energy dependence of the structure for 201 Tl [70], the fission characteristics of 180 Hg and 201 Tl are rather similar. Also other nuclei in this mass region show similar features, which have been attributed to the influence of fragment shells [72].…”

Section: Empirical Fragment Shellsmentioning

confidence: 99%

See 3 more Smart Citations

General Description of Fission Observables: GEF Model Code

Schmidt

Jurado

Amouroux

et al. 2016

Nuclear Data Sheets

427

421

View full text Add to dashboard Cite

The GEF ("GEneral description of Fission observables") model code is documented. It describes the observables for spontaneous fission, neutron-induced fission and, more generally, for fission of a compound nucleus from any other entrance channel, with given excitation energy and angular momentum. The GEF model is applicable for a wide range of isotopes from Z = 80 to Z = 112 and beyond, up to excitation energies of about 100 MeV. The results of the GEF model are compared with fission barriers, fission probabilities, fission-fragment mass-and nuclide distributions, isomeric ratios, total kinetic energies, and prompt-neutron and prompt-gamma yields and energy spectra from neutron-induced and spontaneous fission. Derived properties of delayed neutrons and decay heat are also considered.The GEF model is based on a general approach to nuclear fission that explains a great part of the complex appearance of fission observables on the basis of fundamental laws of physics and general properties of microscopic systems and mathematical objects. The topographic theorem is used to estimate the fission-barrier heights from theoretical macroscopic saddle-point and ground-state masses and experimental ground-state masses. Motivated by the theoretically predicted early localisation of nucleonic wave functions in a necked-in shape, the properties of the relevant fragment shells are extracted. These are used to determine the depths and the widths of the fission valleys corresponding to the different fission channels and to describe the fission-fragment distributions and deformations at scission by a statistical approach. A modified composite nuclear-level-density formula is proposed. It respects some features in the superfluid regime that are in accordance with new experimental findings and with theoretical expectations. These are a constant-temperature behaviour that is consistent with a considerably increased heat capacity and an increased pairing condensation energy that is consistent with the collective enhancement of the level density. The exchange of excitation energy and nucleons between the nascent fragments on the way from saddle to scission is estimated according to statistical mechanics. As a result, excitation energy and unpaired nucleons are predominantly transferred to the heavy fragment in the superfluid regime. This description reproduces some rather peculiar observed features of the prompt-neutron multiplicities and of the even-odd effect in fission-fragment Z distributions. For completeness, some conventional descriptions are used for calculating pre-equilibrium emission, fission probabilities and statistical emission of neutrons and gamma radiation from the excited fragments. Preference is given to simple models that can also be applied to exotic nuclei compared to more sophisticated models that need precise empirical input of nuclear properties, e.g. spectroscopic information.The approach reveals a high degree of regularity and provides a considerable insight into the physics of the fission process. Fission obs...

show abstract

Section: Andsupporting

confidence: 80%

Section: Empirical Fragment Shellsmentioning

confidence: 99%

Section: Empirical Fragment Shellsmentioning

confidence: 99%

Section: Empirical Fragment Shellsmentioning

confidence: 99%

See 2 more Smart Citations

General Description of Fission Observables: GEF Model Code

Schmidt

Jurado

Amouroux

et al. 2016

Nuclear Data Sheets

427

421

View full text Add to dashboard Cite

show abstract

“…For mono-energetic neutron-induced fission, most of the data available are for actinides induced by either 3 or 14 MeV neutrons [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37]. Some of the data on various mono-energetic neutron-induced fissions of actinides are available for specific nuclides such as 232 Th [38][39][40][41][42], 233,235,238 U [43][44][45][46][47][48], 237 Np [49,50] and 239 Pu [33,51]. Similarly yields of fission fragments in the excitation energy range of the GDR region due to electromagnetic fission in inverse kinematics [52][53][54] are available for neutron-deficient lighter actinides such as 214-223 Ac, 220-229 Th, 224-232 Pa and 231-234 U.…”

Section: Introductionmentioning

confidence: 99%