ENDF/B-VII.1 Nuclear Data for Science and Technology: Cross Sections, Covariances, Fission Product Yields and Decay Data

http://nrv.jinr.ru/nrv/webnrv/elastic_scattering/KoningP.pdf

Local and global nucleon optical models from 1 keV to 200 MeV

Modern Nuclear Data Evaluation with the TALYS Code System

https://www.cns.s.u-tokyo.ac.jp/~shimoura/research/nuc_data/pdf/11.pdf

Energy levels of light nuclei A = 11-12

Nuclear reaction cross sections are important for a variety of applications in the areas of astrophysics, nuclear energy, and national security. When these cross sections cannot be measured directly or predicted reliably, it becomes necessary to develop indirect methods for determining the relevant reaction rates. The surrogate nuclear reactions approach is such an indirect method. First used in the 1970s for estimating ðn; fÞ cross sections, the method has recently been recognized as a potentially powerful tool for a wide range of applications that involve compound-nuclear reactions. The method is expected to become an important focus of inverse-kinematics experiments at rareisotope facilities. The present paper reviews the current status of the surrogate approach. Experimental techniques employed and theoretical descriptions of the reaction mechanisms involved are presented and representative cross section measurements are discussed.

Compound-nuclear reaction cross sections from surrogate measurements

Differential cross sections for neutron elastic and inelastic scattering from the actinide nuclei 232Th, 233U, 235U, 238U, 239Pu, and 242Pu have been measured at incident energies ranging from 0.6 ...

Neutron Scattering Cross Sections for 232Th, 233U, 235U, 238U, 239Pu, and 242PU Between 0.6 and 3.4 MeV

Measurements of differential cross sections for fast neutrons scattered by carbon are presented for 14 incident neutron energies between 8.0 and 14.5 MeV. The measurements were performed with the four-detector neutron time-of-flight facility of the Centre d'Etudes de Bruyeres-le-Chatel tandem Van de Graaff accelerator. The angular distributions for elastic and inelastic scattering to the first excited level of /sup 12/C were obtained over the angular range from 10 to 160/sup 0/. The experimental uncertainties vary from 7 to 15% for the differential elastic scattering cross sections and from 8 to 22% for the differential inelastic scattering cross sections. These measurements partially fill in an energy range that was previously characterized by a lack of data. The angle-integrated cross sections are compared to the evaluated values of ENDF/B, and significant discrepancies are shown. The present data were included in an evaluation work on carbon carried out in this laboratory. The consistency of total cross-section measurements with our data and other partial cross sections is discussed.

Measurement of the differential elastic and inelastic neutron scattering cross sections of carbon from 8. 0 to 14. 5 MeV

Measurements of elastic and inelastic scattering cross sections have been performed for 2.5 and 4.1 MeV neutrons incident on ${}^{155,156,157,158,160}\mathrm{Gd}.$ Angular distributions have been measured at both energies for the ${0}^{+},$ ${2}^{+},$ and ${4}^{+}$ members of the ground-state (gs) band of the even-even isotopes and for the ${3/2}^{\ensuremath{-}},$ ${5/2}^{\ensuremath{-}},$ and ${7/2}^{\ensuremath{-}}$ levels of the gs band of the even-odd isotopes. Angular distributions for inelastic scattering from the ${9/2}^{\ensuremath{-}}$ level of the gs band of ${}^{155}\mathrm{Gd}$ and ${}^{157}\mathrm{Gd}$ have also been measured at 4.1 MeV. These results together with previously measured s- and p-wave strength functions, potential scattering radii, and elemental total cross sections have been combined in an analysis based on coupled-channel semimicroscopic optical model potential (OMP) and statistical model calculations. The deformed OMP, an extension of our earlier work [E. Bauge, J.P. Delaroche, and M. Girod, Phys. Rev. C 48, 1118 (1998)], is built using a complex density-dependent effective interaction and deformed matter densities deduced from unconstrained, axially symmetric Hartree-Fock-Bogoliubov (HFB) calculations based on the Gogny force. The HFB calculations which describe quite nicely a wealth of results from electron scattering and Coulomb excitations measurements, lead to semimicroscopic OMP predictions in good agreement with the neutron scattering and reaction measurements. A phenomenological OMP analysis is also performed to compare the global properties of both potentials.

Neutron scattering from the 1 5 5 , 1 5 6 , 1 5 7 , 1 5 8 , 1 6 0 Gd isotopes: Measurements and analyses with a deformed, semimicroscopic optical model

Differential production cross sections for gamma rays from the 56Fe(n,n’y) reactions are presented for incident-neutron energies between 2.5 and 14.1 MeV. The reactions are studied at 11 neutron en...

Gamma-Ray-Production Cross Sections for the 56Fe(n,n’y) Reaction from 2.5- to 14.1-MeV Neutron Energies

Differential cross sections for neutron scattering from four even-A isotopes of Sm have been measured at an incident energy of 7 MeV. Separated isotope samples having enrichments between 87.4 and 99.5% were used, each sample containing about 0.15 moles. Measurements have been separated for elastic and inelastic scattering to the first 2/sup +/ levels of /sup 148/Sm, /sup 150/Sm, and /sup 152/Sm. For /sup 154/Sm the two processes were not separated. The data show directly the striking effects of the difference in coupling between the 0/sup +/ and 2/sup +/ levels of these transitional nuclei. Accurately measured total cross sections and low energy scattering properties have been combined with these 7 MeV results in a coupled-channel analysis. Coupling parameters extracted from the analysis have been shown to be significantly less than the deformation parameters which characterize the charge distributions of the deformed isotopes.

J. Lachkar

Papers

Neutron Scattering Cross Sections for 232Th, 233U, 235U, 238U, 239Pu, and 242PU Between 0.6 and 3.4 MeV

Measurement of the differential elastic and inelastic neutron scattering cross sections of carbon from 8. 0 to 14. 5 MeV

Neutron scattering from the 1 5 5 , 1 5 6 , 1 5 7 , 1 5 8 , 1 6 0 Gd isotopes: Measurements and analyses with a deformed, semimicroscopic optical model

Gamma-Ray-Production Cross Sections for the 56Fe(n,n’y) Reaction from 2.5- to 14.1-MeV Neutron Energies

Deformation effects in neutron scattering from the Sm isotopes