Zobrazeno 1 - 10
of 21
pro vyhledávání: '"Ewa Krynicka"'
Publikováno v:
Annals of Nuclear Energy. 35:1403-1413
Diffusion cooling of thermal neutron flux in a finite volume of a medium results from the leakage of neutrons. The cooling effect is particularly complex when the system consists of zones with different neutron scattering properties. A study is prese
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::94091c16c9af69b3fd992375579cb8fb
https://doi.org/10.1016/j.anucene.2008.01.024
https://doi.org/10.1016/j.anucene.2008.01.024
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 580:369-372
The pulsed thermal neutron experiments have been modeled in two-zone spherical and cylindrical systems. The outer zone of Plexiglas has surrounded either hydrogenous or non-hydrogenous inner zone. The MCNP code has been used in the numerical simulati
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1b26b615b7d697bacc3ab397bd604c70
https://doi.org/10.1016/j.nima.2007.05.181
https://doi.org/10.1016/j.nima.2007.05.181
Publikováno v:
Applied Radiation and Isotopes. 65:877-882
The thermal neutron diffusion parameters of a rock material depend on the rock matrix itself and on the water content. The effect has been studied in quartz by Monte Carlo (MC) simulations of the variable buckling experiment for nine series of sample
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4253992a9474553f23437fb9ce39c6d0
https://doi.org/10.1016/j.apradiso.2007.02.011
https://doi.org/10.1016/j.apradiso.2007.02.011
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 251:19-26
A comparison of real and Monte Carlo simulated pulsed neutron experiments in two-zone cylindrical systems is presented. Such geometry is met when a neutron moderator surrounds a sample of the investigated material. In this study, a Plexiglas shell (h
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f260b3da51afa9612d14400378ddb12b
https://doi.org/10.1016/j.nimb.2006.05.029
https://doi.org/10.1016/j.nimb.2006.05.029
Autor:
Urszula Wiącek, Krzysztof Drozdowicz, Urszula Woźnicka, Ewa Krynicka, Andrzej Igielski, Barbara Gabańska
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 247:349-360
A pulsed neutron method to measure the water or hydrogen content in a rock material has been elaborated and tested on the experimental set-up at the fast neutron generator in the IFJ PAN (Krakow, Poland). A dedicated pulsed thermal neutron source has
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::06475fcf22e3aecfe95c1613debc978e
https://doi.org/10.1016/j.nimb.2006.03.005
https://doi.org/10.1016/j.nimb.2006.03.005
Autor:
Ewa Krynicka, Urszula Wiącek
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 243:92-98
Pulsed neutron experiments in two-zone spherical and cylindrical geometry has been simulated using the MCNP code. The systems are built of hydrogenous materials. The inner zone is filled with aqueous solutions of absorbers (H3BO3 or KCl). It is surro
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::146e31e0f494b7f9242aa14d65a02831
https://doi.org/10.1016/j.nimb.2005.07.213
https://doi.org/10.1016/j.nimb.2005.07.213
Publikováno v:
Journal of Physics D: Applied Physics. 38:2967-2976
The thermal neutron diffusion cooling effect is a result of the perturbation of the thermal neutron energy distribution owing to the leakage of neutrons outside a finite volume of the medium. In multi-zone systems an additional perturbation appears b
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fe0b430174b351afbc138f44e2a26b0a
https://doi.org/10.1088/0022-3727/38/16/033
https://doi.org/10.1088/0022-3727/38/16/033
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 213:42-48
The theoretical approach to the influence of granulation of samples on the measured thermal neutron absorption cross-section has been verified in an experiment on samples containing irregular grains. The neutron absorption heterogeneity effect is def
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::227a61e07b297836b874338d8c255b9d
https://doi.org/10.1016/s0168-583x(03)01531-3
https://doi.org/10.1016/s0168-583x(03)01531-3
Publikováno v:
Applied Radiation and Isotopes. 58:131-136
The thermal neutron absorption cross section of a heterogeneous material is lower than that of the corresponding homogeneous one which contains the same components. When rock materials are investigated the sample usually contains grains which create
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ab4f29af9175193749424bad3d3264e2
https://doi.org/10.1016/s0969-8043(02)00259-2
https://doi.org/10.1016/s0969-8043(02)00259-2
Publikováno v:
Annals of Nuclear Energy. 28:1485-1497
The thermal neutron absorption is considered in a medium which contains highly absorbing grains. The theoretical approach is based on a definition of the effective macroscopic absorption cross-section for such a medium. The parameter of the grain eff
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fd9810f32bf2e061dcef1403200f2562
https://doi.org/10.1016/s0306-4549(00)00137-7
https://doi.org/10.1016/s0306-4549(00)00137-7