10th International Conference on High Level Environmental Radiation Areas (ICHLERA 2022)

Session

From Oklo samples to natural core simulations

28 juin 2022, 16:10

Présidents de session

From Oklo samples to natural core simulations: From Oklo samples to natural core simulations

• F. GAUTHIER-LAFAYE

147. The Gabonionta: Great Oxidation Event, reactors and Life...

Prof. Abderrazzak EL ALBANI (University of Poitiers, )

28/06/2022 16:10

ORAL

The emergence of complex life more than five hundred million years ago marked the beginning of change in the Earth’s biosphere. This evolutionary change is associated with numerous events including increasing predation, burrowing, and animal diversity during the so called “Cambrian Explosion” at the Ediacaran-Cambrian boundary. However, several studies have reported that scattered fossils of...

144. Natural Nuclear Reactors: prediction, search, discovery, operation and implications

Prof. Alex Meshik (Washington University in St. Louis)

28/06/2022 16:30

ORAL

Natural nuclear reactors operated in Oklo (Gabon) about 2.0 billion years ago [1]. This phenomenon was predicted and led to a systematic search for uranium deposits that went critical. Fifty years ago, just a few years after this search was abandonded, the Oklo phenome-non was discovered by chance. Many elements extracted from the Oklo reactor material still carry clear isotopic signatures...

148. Evidence of fast neutron operating in Oklo

Prof. Hiroshi HIDAKA (Nagoya University, Japan, )

28/06/2022 16:50

ORAL

The fission processes for thermal neutron induced 235U and 239Pu fission and for fast neutron induced 238U fission produce fragments with a wide range of mass (72<A<162; A=mass number), and neutrons. As the results of fission events, many elements in the Oklo reactor zones (hereafter, RZs) and the related samples show the variations in the isotopic compositions caused by a combination of...

155. The Oklo natural fission reactors and dynamical models of dark energy

Prof. David Davis1 DAVIS (University - Kimberley, South Africa)

28/06/2022 17:10

From Oklo samples to natural core simulations

ORAL

Paul Dirac is credited with being the first physicist to speculate in print that fundamental constants like the Newtonian gravitational constant G may change over cosmological intervals. Incongruous though this notion may be, it has gained traction among physicists. Modern theoretical frameworks, which attempt to unify all the fundamental forces, accommodate the possibility of varying...

97. Parallel between natural Oklo cores and industrial reactors operating

28/06/2022 17:30

ORAL

TThe first man-made nuclear reactor was developed by Fermi at the University of Chicago and was first started in December 1942. This was the confirmation that one is able to use sustained fission reactions to produce energy. Following this success, the many types of nuclear reactors studied have given rise to several families of reactors corresponding to different orientations and technical...