Neutron moderation in the Oklo natural reactor and the time variation of α

@article{Lamoreaux2004NeutronMI,
  title={Neutron moderation in the Oklo natural reactor and the time variation of $\alpha$},
  author={Steve Keith Lamoreaux},
  journal={Physical Review D},
  year={2004},
  volume={69},
  pages={121701}
}
In previous analyses of the Oklo (Gabon) natural reactor to test for a possible time variation of the fine-structure constant $\ensuremath{\alpha},$ a Maxwell-Boltzmann low energy neutron spectrum was assumed. We present here an analysis where a more realistic spectrum is employed and show that the most recent isotopic analysis of samples implies a decrease in $\ensuremath{\alpha},$ over the last $2\ifmmode\times\else\texttimes\fi{}{10}^{9}$ years since the reactor was operating, of… Expand
Probing variations in fundamental constants with radio and optical quasar absorption‐line observations
Nine quasar absorption spectra at 21-cm and ultraviolet (UV) rest-frame wavelengths are used to estimate possible variations in x {triple_bond} {alpha}{sup 2}g{sub p}{mu}, where {alpha} is the fineExpand
Collisional perturbation of radio-frequency E1 transitions in an atomic beam of dysprosium
We have studied collisional perturbations of radio-frequency (rf) electric-dipole (E1) transitions between the nearly degenerate opposite-parity levels in atomic dysprosium (Dy) in the presence of 10Expand
The role of mass spectrometry to study the Oklo-Bangombé natural reactors.
TLDR
The Oklo fission reactors and their near neighbor at Bangombé, some 30 km to the south-east of Oklo, are unique in that not only did they become critical some 2 x 10(9) years ago, but also the deposits have been preserved over this period of geological time. Expand
Natural nuclear reactor at Oklo and variation of fundamental constants: Computation of neutronics of a fresh core
Using modern methods of reactor physics, we performed full-scale calculations of the Oklo natural reactor. For reliability, we used recent versions of two Monte Carlo codes: the Russian code MCU-REAExpand
Oklo reactors and implications for nuclear science
We summarize the nuclear physics interests in the Oklo natural nuclear reactors, focusing particularly on developments over the past two decades. Modeling of the reactors has become increasinglyExpand
Investigation of the fundamental constants stability based on the reactor Oklo burn-up analysis
The burn-up of few samples of the natural Oklo reactor zones 3, 5 was calculated using the modern Monte Carlo code. We reconstructed the neutron spectrum in the core by means of the isotope ratios:Expand
NATURAL NUCLEAR REACTORS, THE OKLO PHENOMENON
In 1972, natural nuclear reactors were discovered in Western Equatorial Africa in the Gabon Republic, at the adjacent Oklo and Okelobondo mines, and at Bangombe 35 kilometers away. French PhysicistExpand
Single barium ion spectroscopy: light shifts, hyperfine structure, and progress on an optical frequency standard and atomic parity violation
Single trapped ions are ideal systems in which to test atomic physics at high precision: they are effectively isolated atoms held at rest and largely free from perturbing interactions. This thesisExpand
Relativistic corrections to the isotope shift in light ions
We calculate the isotope mass shift for several light atoms and ions using Dirac wave functions and the mass shift operator with relativistic corrections of the order of ({alpha}Z){sup 2}. CalculatedExpand
Enhanced sensitivity to the time variation of the fine-structure constant and m(p)/m(e) in diatomic molecules: A closer examination of silicon monobromide
Recently it was pointed out that transition frequencies in certain diatomic molecules have an enhanced sensitivity to variations in the fine-structure constant {alpha} and the proton-to-electron massExpand
...
1
2
3
4
5
...