Showing papers in "Journal of Nuclear Energy in 1958"

TL;DR: In this paper, the equilibrium equations of a perfectly conducting fluid (1) div B = 0, grad p = J x B = curl B x B/u are corsidered.

TL;DR: In this article, molybdenum and tungsten have been irradiated with pile neutrons at 30°C and at −196°C, respectively, and the recovery of the increase in resistivity has been studied.

TL;DR: In this article, a variational expression for the decay constant is formulated and evaluated for trial solutions of the Maxwellian form for the neutron spectrum, for small deviations from thermal equilibrium, an expression of the form proposed by von Dardel is obtained.

TL;DR: In this paper, a variational principle has been used to study continuous plasma and field distributions in order to see at what point instability might be expected, and it is shown that the change in energy of the hydromagnetic system is a function of whether some \ can produce a diminution of the energy.

TL;DR: In this article, the trajectories of a collection of charged particles in an axially symmetric magnetic field configuration were studied and several different types of Coulomb collisions were observed by analytic and numerical methods.

TL;DR: In this article, it was shown that a long cylindrical plasma column with a homogeneous magnetic field along the axis has been chosen as a configuration which is free from short-circuiting effects such as those described by Simon.

TL;DR: In this article, the use of a thermal-emission ion source in a mass spectrometer is discussed in the light of the fractionation errors, and the difficulties of background spectra when using high-sensitivity electron multiplier ion detectors.

TL;DR: In this article, the stability of a system of charged particles in the Boltzmann equation in the small m/e limit has been investigated, and the results show that the first order variation of the energy vanishes trivially and the second order variation yields a quadratic form in the displacement variable ξ.

TL;DR: In this article, an expression for the decay constant of the fundamental spatial mode of neutron flux as a function of the buckling of moderating assembly is derived, without making any explicit assumption regarding the variation of transport mean free path λ tr with neutron energy.

TL;DR: In this paper, the Bohr-Wheeler mechanism of delayed neutrons from fission has been used, together with recent fission mass-and charge-distribution data, to interpret the observed characteristics.

TL;DR: A review of some experiments on plasma radiation in a magnetic field is presented in this article, where the degree of plasma radiation confinement necessary for self-sustaining the thermonuclear reaction is reached only if the layer is large.

TL;DR: In this paper, it was shown that the swelling is caused by the separation of the fission gases, krypton and xenon, to form gas pockets in the metal, and the mechanism of swelling was discussed.

TL;DR: A discussion of the magnetic acceleration of plasma can be found in this paper, where Bostick has developed a source capable of propelling a mixture of ions of titanium into vacuum at speeds of the order of 10 cm/sec.

TL;DR: In this article, detailed calculations of the scattering of thermal and cold neutrons, average logarithmic energy decrement, mean energy loss per collision, the slowing-down age and time and the variation of the transport cross-section with energy have been made for the first time for beryllium oxide, which is an important moderator material.

TL;DR: In this article, the expression of GuREVICH and POMERANCHUK (1) for resonance absorption in a lattice of small fuel elements is generalized to the case of a close-packed lattice.

TL;DR: In this article, the authors examined the influence of a longitudinal magnetic field on the instabilities of the pinch effect and showed that external conductors are in fact not important due to the finite length of the machine.

TL;DR: In this article, it was shown that the gyro radius governs the shock transition under appropriate circumstances, such as the case of infinite mean-free-path with no collisions between particles.

TL;DR: The toroidal pinch (with a superimposed Bz field, by the writer in 1948) was selected as the confinement geometry for initial study and it passed through the usual vicissitudes and modifications as discussed by the authors, instability, linear dynamic pinches (Columbus), rf pinches, so called Bz and wall stabilized pinches; while parallel speculations and experimental forays were made into cusped geometries (Picket Fence), spinning plasmas, shocks in axial and convergent geometry and magnetic mirrors.

TL;DR: Energy loss along the track of a fission recoil or α-particle in superheated uranyl sulphate solution or the recoil from a fast-neutron collision in super-heated ether can account for evaporation of sufficient liquid to form bubble nuclei under conditions where nucleation is observed as discussed by the authors.

TL;DR: In this paper, the most reactive metals can be melted without contamination by arc-melting on a water-cooled copper hearth, where a zone of a metallic rod is melted by a tungsten arc.

TL;DR: In this article, it is pointed out that the future of thermonuclear power reactors will depend upon the construction of a machine that produces more electric energy than it consumes, and it is suggested that explosive fusion energy released underground may be harnessed for the production of electricity before the same feat is accomplished in controlled fusion processes.

TL;DR: In this paper, it was found that there is strong evidence for a correlation existing over an energy range containing approximately sixty levels, and a quantitative account of this correlation was worked out on the assumption that the cross-section at any given point is partly determined by the local average cross-sections over an interval containing sixty levels.

TL;DR: In this paper, the thermal neutron capture cross-section and the resonance-capture integral of 236U have been determined by an activation method, and the half-life of 237U has been determined as 162·04 ± 0·95 hours.

TL;DR: In this paper, it was shown that the dominant mechanisms of diffusion are ion-neutral atom and electron neutral atom collisions and that the degree of ionization needed to be smaller than about 1%.

TL;DR: In this paper, the shape of the slow neutrons emerging from an experimental hole is best fitted with a function which is nearly maxwellian in shape dn = const. lambda /sup -4.07/ exp -STA( lambda /sub 0/ lambda )/sup 2/!, where lambda / sub 0/ = 1.6 6/sub 8/ A and corresponds to a neutron temperature of (341 plus or minus 10) deg K.

TL;DR: Author(s): Anderson, Oscar A.

TL;DR: In this article, the authors measured the transmission of neodymium oxide enriched in the isotope 143 Nd using a crystal spectrometer covering the energy range 0·01 −10 eV.

TL;DR: In this article, six different RaBe neutron sources have been compared directly to the Swedish standard Ra-α-Be source, these six sources coming from U.S., U.K., Switzerland and Belgium, and it is shown that all the absolute measurements fall within ±2·4 per cent from this average.