bluuebunny/crossref_metadata_2025 huggingface dataset:
Gyromagnetic Absorption at the Fundamental
Authors: Melrose DB
Published: June 2011

Using a conventional procedure to treat gyromagnetic absorption in the centre of the line at the fundamental, it is found that there is a small range of angles ("" 5� in the solar corona) where the damping is weak. The procedure used by Gershman (1960) is shown to be nonphysical in that the time-irreversible properties of the waves are calculated using the time-reversible response of the plasma, and vice versa.
A Proposed Experimental Investigation of Transverse Stress Wave Propagation in Plasmas at Microwave Frequencies
Authors: Bydder EL , Liley BS
Published: June 2011

The propagation properties of transverse electromagnetic waves in plasmas are discussed from the point of view of the 13-moment approximation. It is shown that additional modes, termed stress modes, should be able to propagate in a plasma even below the p
22 GHz Observations of Southern H2O Sources
Authors: Caswell JL , Batchelor RA , Haynes RF , Huchtmeier WK
Published: June 2011

The discovery of three new H20 sources associated with HII regions is reported. Observations of other southern H20 sources show, in several instances, considerable intensity changes over a 20-month interval.
Solution of Eight-vertex Lattice Model Without Elliptic Functions
Authors: Kumar Kailash
Published: June 2011

Baxter's method of solving the eight-vertex model in lattice statistical mechanics is examined from an elementary point of view. It is shown that the algebraic operations in the method can be carried out without recourse to elliptic functions. These include: construction of certain subspaces invariant uti.der the action of the transfer matrix; reduction of the transfer matrix eigenvalue problem to an equivalent ice-type problem and construction of certain matrices which commute with the transfer matrix and satisfy a functional matrix equation.
Phenomenological Theory of Magnon Sideband Shapes in a Ferromagnet with Impurities
Authors: Richardson DD
Published: June 2011

A simple model Hamiltonian is used to calculate exactly the line shapes of magnon sidebands in excitonic spectra in a ferromagnet, using Green functions. The effect of a spin defect in the crystal is included in the calculation. In contrast to previous work, no approximations involving Green function decoupling are necessary for this Hamiltonian which, however, contains the essential physical features of the problem. Some one-dimensional crystal line shapes are calculated to illustrate the features of the theory, and application to realistic crystals is discussed.
Nonlinear Thermal Convection in a Layer with Imposed Energy Flux
Authors: Van der Borght R
Published: June 2011

Results are reported of an investigation into the effect of the chosen boundary conditions on the steady finite-amplitude convective motions in a layer in which the average energy flux is imposed. The boundary conditions are chosen with a view to the application of the results to solar granulation and supergranulation. It is shown that, at high Rayleigh numbers, solutions do in fact exist for which there is no modulation in the energy flux and little fluctuation in the temperature across the boundaries.
2700 MHz Polarization Observations of 17 Supernova Remnants
Authors: Milne DK , Dickel JR
Published: June 2011

Maps are presented of the polarization and total-power emission at 2700 MHz from 17 supernova remnants, including the Monoceros nebula, the Lupus loop and W44. irections of the magnetic field and values of the rotation measure are deduced for W44 by ombining 2700 and 5000 MHz observations.
18 cm Observations of 19 New Southern OH Emission Sources
Authors: Robinson BJ , Caswell JL , Goss WM
Published: June 2011

In a search for 1665 MHz OH emission in the southern Milky Way, 19 new sources have been discovered. Line profiles of all four 18 cm transitions are presented for all but one of the sources, and we discuss the general properties of the sources and their distribution in relation to the positions searched.
Parity-nonconserving Effects in n?p Capture at Thermal Energies
Authors: R Lassey Keith , HJ McKellar Bruce
Published: June 2011

The circular polarization and asymmetry, about the incident neutron spin direction, of the photon released in the reaction n + p -+ d + y at thermal neutron energies are consequences of parity violation in the n-p interaction. A formalism is developed which expresses the polarization and asymmetry in terms of the half-off-shell transition matrix, and calculations are performed for several models of the weak parity-nonconserving N-N interaction. The results indicate that the polarization is sensitive to the choice of both the strong N-N interaction and weak N-N interaction while the asymmetry is sensitive mainly to the latter. The observed polarization is of the same sign and rather larger than that calculated with the conventional weak N-N potential. Difficulties in the present method indicate that this discrepancy cannot be regarded as significant.
Collective Oscillations in Many Electron Atoms. III. Photoabsorption
Authors: Monaghan JJ
Published: June 2011

The generalization by Bloch of the Thomas-Fermi atom to time-dependent motion is applied to the calculation of the photoabsorption cross section. The results are in reasonable agreement with the experimental cross sections in the range of photon energies 0�3 Z e V < lim < 300 Z e V, where Z is the atomic number of the atom.
Simultaneous Observation of Fading Rates on Two Transequatorial H.F. Radio Paths
Authors: Carman EH , Heeran MP , Röttger J
Published: June 2011

Fading rates of transequatorial h.f. signals are evaluated from observations on the paths LindauRoma and Tsumeb-Lindau which cross the equatorial zone of Africa. The fading characteristics on both paths are shown to be correlated. A comparison with transequatorial pulse transmission, which indicates off-great-circIe propagation due to spread-F irregularities, gives evidence for a high correlation between the fading of c.w. signals propagating on transequatorial paths and the occurrence of off-great-circIe propagation due to equatorial spread-F irregularities.
Generalizations of Boltzmann's Equation
Authors: Anstis GR
Published: June 2011

A scheme is proposed for systematically generalizing Boltzmann's equation in order to describe the non-equilibrium behaviour of an arbitrarily dense gas. The method avoids the divergences that arise from considering the dynamics of groups of isolated particles by introducing appropriate damping terms. Transport coefficients are obtained from the kinetic equations by using the autocorrelation formulae. For a one-dimensional gas of impenetrable point particles, approximations to the coefficient of self-diffusion may be obtained readily from the proposed generalization. A first correction to Boltzmann's equation yields the self-diffusion coefficient to within 1 % of its exact value.
Measurements of Ionospheric Refraction at 80 MHz Using Discrete Radio Sources
Authors: Slee OB , Lee PY
Published: June 2011

About 2000 measurements of source positions obtained at 80 MHz with the Culgoora radioheliograph near the peak of the solar activity cycle in 1968-71 have been used to determine the regular ionospheric lefraction. Diurnal, seasonal and zenith-angle dependencies of the refraction are deduced and found to be qualitatively consistent with the known gradients in peak electron density. The variability of the refraction from one measurement to the next is found to depend upon the zenith angle and season and to be mainly due to ionospheric disturbances whose presence is not usually revealed by measurements of the F2 critical frequency. A quantitative comparison of the measured values of angular refraction with the F2 critical frequency and its north-south and east-west gradients demonstrates the validity of the theoretical expressions for regular refraction developed by Komesaroff (1960) and yields a value of 190� 12 km for the equivalent thickness of the nocturnal ionosphere. A comparison of the present measurement of the thickness parameter with measurements of the same quantity made during the minimum of solar activity shows that the shape of the F2 layer is not dependent on the solar activity cycle and hence is not a sensitive measure of the gas temperature.
l557·7 nm Pulsations within Quiet Pre-breakup Aurorae at L = 8·7
Authors: Thomas IL
Published: June 2011

Pulsations in the [01] .A. 557�7 nm emission, with a typical period of 10-20 s, were consistently observed within quiet pre-breakup auroral forms from Mawson, Antarctica (L = 8'7), during 1967. By relating these observations to the modal location of the auroral oval, an indication of the parent magnetospheric region is gained. From these results, and other reports, it is concluded that optical pulsations are a basic feature of the auroral display. The occurrence of an 'optical auroral pulsation pearl necklace' is reported.
Detection of the 31?31(A) Transition of Methanol in SagittariusB2
Authors: Robinson BJ , Brooks JW , Godfrey PD , Brown RD
Published: June 2011

The 3c 31 A-branch transition of methanol has been observed in emission in Sgr B2. A laboratory determination of the rest frequency of 5005�32 MHz indicates that the radial velocity of the line in SgrB2 is 57 kms-1 ?
A Note on Unitarity in Resonance Theory
Authors: Bertram WK , Cook JL
Published: June 2011

Equations resulting from the unitarity of the collision matrix are investigated in standard esonance theory. The nonuniqueness or otherwise of fitted resonance parameters is discussed.
Measurement of Apparent Spin?Spin Relaxation Times in Nuclear Quadrupole Resonance Using a Double Pulsed Super-regenerative Oscillator
Authors: Doolan KR , Hacobian S
Published: June 2011

A super-regenerative oscillator has been used to obtain apparent spin-spin relaxation times n for nuclear quadrupole resonance signals from some polycrystalline compounds. A mathematical analysis is given to show how T~ values may be obtained from a double pulsed super-regenerative oscillator for both logarithmic and linear modes of detection; each of these modes is described. Results obtained from both modes of operation are examined.
Supersonic Neutral Winds in an Outer Atmosphere. III. A Two-dimensional Model
Authors: Gilbert NE
Published: June 2011

A steady two-dimensional model that represents the part of a convection cell where the neutral gas constituent is rising and becoming supersonic is presented for both isothermal and variable temperature conditions in an intensely heated region of the outer atmosphere of a planet or star. The streamlines and orthogonal curves are represented by a system of confocal hyperbolae and ellipses respectively. The nozzle throat is achieved principally by the physical contraction and subsequent expansion of the gas rather than by a variation in the temperature or in the gravitational force component along the streamline.
Upper Limits on Polarization Effects in Nuclear Collisions
Authors: Mohr CBO
Published: June 2011

The increase in cross section for inelastic collisions due to polarization of the target by the projectile has an upper limit in a simple model. The usual treatment of core polarization in nuclear collisions gives a polarization potential which is too large because of the use of perturbation theory and the neglect of dynamic effects, and which is in phase with the direct coupling potential contrary to recent experimental evidence and to channel coupling theory.
The Nature of D-region Scattering of Vertical Incidence Radio Waves. I. Generalized Statistical Theory of Diversity Effects Between Spaced Receiving Antennas
Authors: Lindner BC
Published: June 2011

A theoretical basis for studying the nature of ionospherically reflected radio waves is described. The expected statistical properties of the amplitude and phase variations of the radio wave ground pattern sampled at a pair of paced receiving antennas are derived for general correlation conditions, assuming different models of the angular spectrum of reflected radio waves. The esults provide a basis for experimental measurements of the angular spread and coherence ratio of the angular spectrum of reflected waves.
5 GHz Polarization Observations of 33 Galactic Radio Sources
Authors: Milne DK , Dickel JR
Published: June 2011

Polarization observations have been made of 33 galactic radio sources, mostly supernova remnants, at a frequency of 5 GHz using the 64 m telescope at Parkes. Maps of the observed polarization vectors superposed upon total intensity isotherms are presented for each source.
Zero-field Mobility for Electrons in Dry and Humid Air
Authors: Milloy HB , Reid ID , Crompton RW
Published: June 2011

The zero-field mobility of electrons in dry and humid air at 294 K has been studied with drift tube techniques. For air containing 1.5 % water vapour (50 % relative humidity) the zero-field mobility was found to be 8.4 � 0.2 X 105 cm s−l Td−l. The zero-field mobility of electrons in dry air (4.7 � 0.2 x 106 cm s−l Td−l) was deduced from measurements in which small quantities of CO2 Were added to reduce the electron energy. It is estimated that the momentum transfer cross section for electron–oxygen collisions, at near thermal energies, is at least four times smaller than it is for electron–nitrogen collisions.
Australian Journal of Physics Astrophysical Supplement
Authors: Bolton JG , Shimmins AJ , Wall JV
Published: June 2011

A catalogue of 34S radio sources is presented, covering right ascensions O&h 00'" to 17hOO'" and 19h30'" to 06h30'" between declinations _4� and -30�. The regions omitted re within - 10� of the galactic plane. The catalogue was compiled from a 'fast' finding survey at 2700 MHz aimed at detecting sources stronger than o� 5 Jy. Subsequent measurements of flux density and position were made on all the sources which were not in the Parkes 40S MHz catalogue, and on some sources in the Parkes 40S MHz catalogue for which only data of low accuracy were available.
Radiative Decay of the Low-lying States of 12C
Authors: M McKay Colette , Spicer BM
Published: June 2011

The B(E2) values for the two 12C radiative transitions 2+(4'43 MeV) --+ O+(g.s.) and 0+(7� 65 MeV)--+ 2+(4�43 MeV) are calculated, using a ground state wavefunction which is a mixture of quartet states. The two transitions can be adequately enhanced over the single-particle transition values. Indeed, the collectivity introduced by the quartet wavefunctions is not the dominant factor in providing the required enhancement; rather the use ofa sufficiently large single-particle basis is necessary.
Gamma Decays, Lifetimes and Spins of 47V Excited States
Authors: Thompson JV , Bell RAI , Carison LE , Najam MR
Published: June 2011

The nucleus 47y has been studied using the 47Ti(p, ny)47y reaction, with isotopically enriched 47Ti targets, incident proton energies from 4�7 to 5�4 MeY, and Ge(Li) y-ray detectors. The previously unreported y-decay of the second excited state was observed.
50Cr(p, g)51Mn Reaction from Ep = 1·45 to 2·07 MeV
Authors: Din GU , AI-Naser AM
Published: June 2011

Proton resonances in the SOCr(p, )1)51 Mn reaction have been studied in the range Ep = 1450-2070 keV. Gamma-ray spectra, measured at 55� to the beam direction at each of the resonances at Ep = 1451, 1546, 1580, 1600, 1689, 1798, 1830, 2031, 2042 and 2067 keV with a high resolution 35 cm3 Ge(Li) detector, have been used to derive the decay schemes of the resonant and bound levels in 51 Mn. Decays to the bound levels at 4'052, 4'729, 4'925, 5'073, 5'129, 5'174, 5'188, 5�203 and 5�506 MeV have been observed in the proton capture reaction for the first time, while new results have been obtained for the decay of some of these levels.
Drift of a Charged Particle in a Static Magnetic Field Having a Power Law Dependence
Authors: Headland M , Seymour PW
Published: June 2011

As a generalization of Seymour's (1959) exact solution for the drift velocity of a charged particle in a static magnetic field of constant gradient, exact solutions are obtained for charged particle drift in a static magnetic field represented by B. = AX', where A and IX are constants. Four cases of bound orbits are analysed. Exact solutions in terms of hypergeometric, confluent hypergeometric and gamma functions are obtained for the displacement Ay per cycle, the periodic time T and the drift velocity Vd. The special solutions in terms of complete elliptic integrals obtained by Seymour (1959) are also recovered. Calculated exact drift velocity characteristics for representative conditions are presented, and the manner in which the exact curves merge into the Alfven approximate drift velocity region is indicated.
Measurements of the Circular Polarization of Radio Sources at Frequencies of 0·63, 1·4, 5·0 and 8·9 GHz
Authors: Roberts JA , Roger RS , Ribes J-C , Cooke DJ , Murray JD , Cooper BFC , Biraud F
Published: June 2011

Circular polarization measurements were made with the Parkes 64 m telescope on 66 mainly extragalactic sources, 33 of which were studied at two or more frequencies. Circular polarization was definitely found in the eight quasi-stellar sources PKS0237-23, 0537-441, 1127-14, 1226+02 (3C273), 1253-05 (3C279), 2134+004, 2145+06 and 2345-16, as it was measured at the 4u level or higher in at least two observing sessions.
Non-existence of Axially Symmetric Massive Complex Scalar Fields
Authors: Rao JR , Panda HS , Nayak BK
Published: June 2011

It is established that time-dependent axially symmetric complex scalar fields (charged scalar fields) do not sustain the mass parameter m within the context of the Einstein- osen metric.
Australian Journal of Physics Astrophysical Supplements
Authors: Slee OB , Higgins CS
Published: June 2011

The 80 MHz survey of radio sources made with the Culgoora radioheliograph has been extended by a further 1748 previously catalogued sources in the declination range -48� to +35� Positions, flux densities and beam broadening measured with this 3'�7 arc resolution instrument are given for 1291 sources, while 457 undetected sources are given in a separate list.
A Relativistic Treatment of Space-Time Rays and the Doppler Effect in General Media
Authors: Bennett JA
Published: June 2011

For waves in plasmas and similar media, space-time rays with a 4-vector formulation are used to obtain an approximate expression for the rapidly varying part of the wave, on the assumption that the plasma properties vary slowly in space and time. It is shown that the phase function associated with the rapid variations is invariant with respect to Lorentz transformation and that the ray equations may be written in vector form. These results are used to obtain expressions for the Doppler shift that are consistent with special relativity. The possibility that the medium is moving and time-varying is allowed for, and a variety of possible sources are considered.
Finite Amplitude Convection in a Compressible Layer with Polytropic Structure
Authors: Van der Borght R
Published: June 2011

In this paper are derived the basic equations for finite amplitude convection in a compressible medium with polytropic structure within the framework of the one-mode anelastic approximation. Only the case of non self-interacting planforms is considered, and the effects of viscous dissipation are not taken into account. These equations are solved numerically to illustrate the effects of compressibility and density stratification on the flow pattern and on the thermodynamic variables and their fluctuations.
Tests of Randomness in Astronomical Objects. II. Along Two Orthogonal Great Circles
Authors: Wesson PS
Published: June 2011

A refinement in computing technique and the use of the von Neumann ratio test are shown to improve the detectability of nonrandomness in astronomical object positions. Correlation is confirmed for those objects (bright galaxies and bright stars) shown to be nonrandomly distributed in Part I. The presence of correlation is also demonstrated, with ~ 10: 1 likelihood ratio at the 98 % confidence level, for the other groups of objects considered in Part I (QSOs, pulsars, planetary nebulae and Arp peculiar objects).
Hadronic Electrons?
Authors: Wolfram Stephen
Published: June 2011

A new form of high energy electron-hadron coupling is examined with reference to the experimental data. The electron is taken to have a neutral vector gluon cloud with a radius ~ 10-18 m. This is shown to be consistent with measurements on e+e- -+ e+e- and 9.-2. At low energies, only photons couple to the gluons, but at higher energies 'evaporation' then 'boiling' of OJ and �J occurs, allowing strong interactions. The model yields accurate predictions for the form of the rise in R = u(e+e--+h)/u(e+e--+p.+p.-). Arguments are given for the order of magnitude of m. and for the lack of a permanent meson cloud in leptons. Strong interaction selection rules forbid a contribution to nO -+ e+e-, and interference with the one-photon channel produces minimal scaling violation in eN processes at present energies. The constant value of u(e+e-)/u(pp) is correctly predicted and evidence from high energy pp interactions is also cited. The'll particles are interpreted as e+eresonances in the evaporation region, and their properties are generated correctly. Predictions are given for the behaviour of u(e�e-) at high energies.
Quantum-mechanical Wave Equation for Two Particles of Spin 0
Authors: Tam Kwong-Chuen
Published: June 2011

A quantum-mechanical wave equation for two particles of spin 0 is presented in Hamiltonian formalism and is then simplified and discussed. Solutions are found for square-well and Coulomb interactions, and energy levels are determined. It is shown that, for the Coulomb interaction, the energy levels to the lowest order agree with those given by the hydrogen atom formula.
5000 MHz Flux Densities and Spectra for 325 Small-diameter Radio Sources at Low Galactic Latitudes
Authors: Caswell JL , Haynes RF , Clark DH
Published: June 2011

Flux density measurements at 5000 MHz are presented for 325 of the small-diameter sources detected in the Molonglo 408 MHz galactic survey. By investigating the spectra we show that probably between 10 % and 15 % of the sources are galactic and the remainder extragalactic.
Effect of Nonlinear Level Crossing on the Output of a Gas Laser
Authors: Mohanty BK , Nayak N
Published: June 2011

A generalized expression for electromagnetic polarization under level crossing in a single-mode gas laser is derived up to the third order in the field strength. This is made possible by the use of the probability integral of complex arguments to avoid the Doppler limit approximation. The level crossing effect is seen to appear in the third order, and its linewidth is shown to be asymmetric. It is also broader than the Lorentzian shape usually obtained under the Doppler limit. The dimensionless intensity parameter of the laser field is seen to lose its symmetry about the resonance value in the presence of level crossing. This is attributed to incoherence among different transitions. Further, the other terms like those describing the two-photon process in the third-order value are briefly discussed.
Australian Journal of Physics Astrophysical Supplement
Authors: J Wills Beverley
Published: June 2011

Accurate measurements of relative flux density have been made between frequencies of 468 and 5009 MHz for 300 radio sources selected from the Parkes catalogue. The observations, their analysis and accuracy are described, and the flux densities presented together with their errors. Excluding the uncertainties in scaling these flux densities to an absolute system, r.m.s. errors vary from 0�24 Jy and 2�4 % at 635 MHz to 1�8 % at 2700 MHz; uncertainties in 'absolute' scaling are thought to be about 5 %. The present flux densities are compared with accurate values published elsewhere. The data have been combined with other published flux densities between 10 and 10000 MHz to derive spectra, which are presented graphically. Some sources whose spectra may be useful for flux density calibration are noted.
The Magnetic Field of a Current Loop Encircling an Axisymmetric Iron Core
Authors: Dewar RL
Published: June 2011

The effect of an iron transformer core on the field of a current loop is examined for two models of the core: (1) An infinite straight rod of high permeability aligned along the axis of symmetry, for which asymptotic expressions for the effect of the core are obtained and compared with numerical results. (2) A rectangular toroidal iron casing surrounding the loop. The latter model is more realistic because a return path is provided for the flux. For this model, the effect of air gaps is considered, and rapidly convergent series are obtained and numerical results are given. The significance of these results for tokamak equilibrium is indicated.
Effect of Relaxation Parameters on the Quantum Theory of an Inhomogeneously Broadened Laser
Authors: Mohanty BK , Nayak N
Published: June 2011

The results of the Riska-Stenholm quantum theory for an inhomogeneously broadened laser are re-derived without using the Doppler limit approximation which restricts the utility of this theory. The photon distribution peak is seen to occur at a significantly lower photon number and the threshold condition is dependent on Yablku, where Yab is the relaxation parameter and ku the Doppler parameter. The dimensionless intensity parameter is obtained and the results are compared with the existing theories of Riska and Stenholm and of Scully and Lamb.
Analysis of the Effect of Resonant Phonon Scattering on the Thermal Conductivity of CaF2
Authors: Hudson PRW , Gibbs EE
Published: June 2011

An analysis is presented of the various phonon contributions to the thermal conductivity of CaF2 doped with 1�0% and 0�1 % of yttrium or thulium. The broad phonon resonant scattering term is found to reduce the low frequency phonon conduction significantly. This is responsible for the relatively stronger suppression of the conductivity at low temperatures in the phonon boundary scattering region. Thus broad quasilocalized phonon resonant scattering mechanisms have a similar effect to phonon precipitate scattering. It also follows that, in the case of a broad resonant scattering mechanism, a dip will not necessarily be seen in the conductivity.
Comments on the Statistical Distribution of Grain Sizes and Grain Density in G-5 Nuclear Emulsions
Authors: Kumar Vinod , Sharma AP
Published: June 2011

This work presents an experimental study of the statistical distribution of the size and density of grains along minimum ionizing 71- tracks in nuclear emulsions. Distribution parameters are computed, and an explanation is given for the departure of the size distribution curve from a normal curve. A quantitative explanation of the magnitude of the experimentally observed minimum grain density is also suggested. The experimental observations agree with the theory.
Some Characteristics of Large Amplitude Pc5 Pulsations
Authors: Chandra Gupta Jagdish
Published: June 2011

An analysis of the 1967 geomagnetic data from five Canadian observatories reveals that Pc5 pulsations of amplitude ;;.40 nT occur most often within geomagnetic latitudes 65�-74�. The occurrences peak during morning hours in the auroral zone but during later hours of the day at higher latitudes, while a strong midnight occurrence peak is also noted at the auroral zone stations. The occurrences and amplitudes in general are found to be largest near the central line of the auroral zone, while the periods are found to increase with increasing latitudes. Stronger magnetic activity seems to generate a larger number of Pc5 pulsations with large amplitudes. With increasing activity, there seems to take place a continuous decrease in the level at which instability develops. This may be inferred from the Baker Lake data, where the period of pulsations decreases continuously with increasing activity. The results of the present investigation seem to fit a model in which the auroral zone ionosphere acts as an amplifier of the amplitude of hydromagnetic waves which arrive along the lines of force from the magnetopause.
Australian Journal of Physics Astrophysical Supplement
Authors: Wall JV , E Wright Alan , Bolton JG
Published: June 2011

A catalogue of 819 radio sources is presented from a 2700 MHz survey of 0'79 sr about the south galactic pole. The catalogue is essentially complete for sources with S2700 ~ 0�22 Jy, corresponding to a source density of 850 sources per steradian. Flux densities were measured for many of the sources at 5009 MHz, including most of the sources with S2700 ~ 0�35 Jy. The accuracy in both the 2700 and 5009 MHz flux densities is O' 02 Jy or 3 %, whichever is the greater. Rootmean- square position errors are ION arc for sources stronger than 0�7 Jy, increasing to 25" for the weakest sources in the catalogue. The catalogue includes the results of a search of the Palomar Sky Survey prints for identification data.
keV Neutron Resonance Capture in Barium-137
Authors: de L Musgrove AR , Allen BJ , Boldeman JW , Macklin RL
Published: June 2011

The neutron capture cross section of 137Ba has been measured to high resolution (AE/E ~ o� 2 %) below En = 60 keY. Average values of resonance parameters, extracted for resonances in the range 2�7 < En < 12 keY, are as follows: s-wave level spacing <D) = 380� 70 eV; s-wave radiative width <Tv). = 80�15meV; s-wave neutron strength function 104 So = 0'57�0'2; and p-wave neutron strength function 104 S1 = 0�45�0�2. The s-wave radiative width and the s-wave neutron strength function appear to be lower for 137Ba than for the other barium isotopes.
Nonlinear Diffusion of Ions in a Gas. II. Diffusion in Finite Enclosures
Authors: Robson RE
Published: June 2011

The connection between nonlinear diffusion and diffusion cooling of ions in a bounded gas is examined using the BGK model kinetic equation.
Interplanetary Scintillation Power Spectra
Authors: Milne RG
Published: June 2011

Power spectrum measurements of interplanetary scintillation at 408 MHz show that an inverse power law spectrum provides the best description for all scintillating radio sources. The inverse power law index is reasonably constant at ~ 2�4 for solar elongation angles 8 > 10�, and this agrees well with spacecraft observations. For 8 < 10� the index apparently decreases with decreasing 8, and this appears to be consistent with recent strong scattering theory. A Bessel analysis attempted in order to detect Fresnel structure proved unsuccessful because of noise on the power spectra.
Note on Prompt Lepton Production
Authors: Peaslee DC
Published: June 2011

It is suggested that a substantial fraction of prompt leptons arise from charmed particles that are constrained to 100% leptonic decay. Some implications for further observation are discussed.
The Ghost Anomaly in the 9Be(p, d)8Be Reaction
Authors: Barker FC , Crawley GM , Miller PS , Steele WF
Published: June 2011

The ghost of the 8Be ground state has been observed in the 9Be(p, d)8Be reaction, and fitted using a many-level R-matrix formalism.
Extended Theory of Magnon Sideband Shapes. I. Impure Three-dimensional Ferromagnets
Authors: Richardson DD
Published: June 2011

A calculation of magnon sideband lineshapes is given which uses a simple phenomenological Hamiltonian allowing of an exact solution. The perturbation Hamiltonian has an improved form compared' with that used by Richardson (1974). We consider the effect of a small concentration of substitutional spin impurities on the sideband. An example of an f.c.c. ferromagnetic crystal is studied in detail, and the conditions for the appearance of local modes due to the impurity are discussed. The possibility of resonance modes occurring within the absmption band is considered but, for the f.c.c. crystal studied here, this appears to be unlikely to within the accuracy of the numerical calculations undertaken.
The Polarization Limiting Region - An Empty Concept
Authors: Simpson MA
Published: June 2011

Polarization changes in stratified anisotropic media are shown to occur at a rate which is substantially independent of the degree of inhomogeneity of the medium, in contrast to the work of earlier authors. As a consequence, the concept of a 'polarization limiting region' introduced by the earlier authors is not useful.
Distinguishing Between Thermalizing and Electrodynamic Coupling For Laser-compressed Thermonuclear Reactions
Authors: Hora Heinrich
Published: June 2011

In the gas-dynamic laser compression of plasmas for exothermal nuclear reactions, certain laser intensities must not be exceeded in order to reach sufficient thermalizing coupling. A criterion for this limitation is developed here, which shows that the published cases of Nuckolls (1974) and Brueckner (1974) are close to this threshold and may not need serious changes due to the coupling process. As weII as the long pulse scheme of Afanasyev et al. (1975), an alternative method exists in which very short and very high intensity laser pulses are applied, thereby avoiding thermalization but generating fast imploding cold and thick plasma shells due to nonlinear ponderomotive forces of optical explosion. A necessary and sufficient condition for this electrodynamic coupling is derived, and the general nonlinear force equation is integrated to derive ion energies and their exact linear increase with ion charge. Experiments indicating the predominance of the nonlinear force are then analysed. The derived criteria are used to explain examples of nonlinear force compression giving 1000 times greater efficiencies for nuclear reactions than the gas-dynamic case.
Geometry Factors for TE0mn Resonance Cavities for Diagnostics of Large-diameter Plasmas
Authors: Janzen G
Published: June 2011

Mode-suppressing resonators oscillating in TEomn modes only are suggested here for the diagnostics of large-diameter plasma columns. Circular cylindrical cavities composed of electrically insulated parallel rings have been found to give the best Q values. Geometry factors are presented for TEomn resonance mode cavities (m = 1, ... , 7; arbitrary n) for different density profiles and filling ratios, allowing absolute electron density determinations.
A Search for Recombination Line Emission from the Galactic Equator at 408 MHz
Authors: Batty MJ
Published: June 2011

A search for H 2520( recombination line emission was made by scanning the galactic equator region using the Molonglo radio telescope. Upper limits were established over the range of galactic longitude accessible to the instrument. For the region III ;S 40�, estimates of the background thermal continuum brightness temperature were used to derive lower limits of ~ 2000 K for the electron temperature of the gas along the line of sight. Lower limits for the electron density obtained by considering probable non-LTE effects suggest that the thermal emission over this range is due to low surface brightness HII regions. The observed H 2520( upper limit averaged over the range 270� ;S I ;S 320� just admits the line intensity calculated by Shaver (1975) for the cold cloud component of the general interstellar medium.
Australian Journal of Physics Astrophysical Supplement
Authors: Clarke JN , Little AG , Mills BY
Published: June 2011

The fourth catalogue of radio sources observed at 408 MHz with the Molonglo radiotelescope is presented. A total of 1349 sources is listed to a limiting flux density of 0�2 Jy, the catalogue being largely complete above 0� 25 Jy. The area of sky surveyed includes the Magellanic Clouds as well as a comparison region of similar angular extent. Detailed notes are provided on some of the Cloud sources, and maps are given for complex sources in the region of the Clouds. Those sources for which high-frequency or optical data are available are classified into two lists, one of Cloud members and the other of 'unidentified nonthermal sources', presumably not Cloud members.
The World as Quarks, Leptons and Bosons
Authors: Gell-Mann M
Published: June 2011

A descriptive review is given of gauge theories of weak, electromagnetic and strong interactions. The strong interactions are interpreted in terms of an unbroken Yang-Mills gauge theory based on SU(3) colour symmetry of quarks and gluons. The confinement mechanism of quarks, gluons and other nonsinglets is discussed. The unification of the weak and electromagnetic interactions through a broken Yang-Mills gauge theory is described. In total the basic constituents are then the quarks, leptons and gauge bosons.
Generalized Statistics and the Quark Model
Authors: Green HS
Published: June 2011

It is suggested that all symmetries in particle physics are either dynamical, and connected with Poincare invariance, or statistical, and connected with invariance under interchange of similar particles. To sustain this view, it is necessary to admit quantum statistics more general than Fermi or Bose statistics. Two different generalizations are considered: parastatistics and a new generalization called modular statistics. A discussion is developed of difficulties which arise with parastatistics of order three or more, but are resolved with the help of the corresponding modular statistics. Applications to the Nagoya model, the standard quark model and 'coloured' quark models are described, together with a dynamical model in which the quarks are identified with different kinds of tachyons.
Breakup Reactions at Intermediate Energy
Authors: McCarthy lE
Published: June 2011

Breakup reactions may be considered by a quasi-three-body model in which the two-body subsystems interact through optical model potentials with imaginary parts describing the excitation of unobserved channels. The distorted wave off-shell impulse approximation neglects only gradients of the optical model potentials. At sufficiently high energies it factorizes into a quantity describing the elementary two-body collision and a distorted wave transform of the bound-state wavefunction, which gives a distorted orbital momentum profile. Examples showing the validity of the approximation are given.
An Improved Calculation of the Multiphoton Bremsstrahlung Process in the Presence of a Laser Beam
Authors: Acharya Rama , Mohan Man
Published: June 2011

It has been noted previously that analyses of free-free transitions in the presence of an ion are appreciably affected by neglecting the Coulomb field of the ion at infinity. We have therefore made here an improved calculation of the cross section for the multiphoton bremsstrahlung process by taking account of the Coulomb field in the initial and final states.
The Optical Model and Proton Elastic Scattering from 14N and 16O
Authors: Gabric A , Amos K
Published: June 2011

Allowing for important doorway state effects in analyses of proton elastic scattering from the light nuclei 14N and 160 enables an average geometry optical model potential to be determined, the strength parameters of which show a smooth behaviour with projectile energy.
Energy Dependence of the Dip in pp Elastic Scattering and the Pomeron Periphery
Authors: Kamran Mujahid , Saleem Mohammad
Published: June 2011

It is shown that, at ISR (intersecting storage ring) energies, the energy dependence of the dip in the differential cross section for pp elastic scattering can be explained by the dual absorptive model with a peripheral pomeron.
High Resolution Neutron Transmission and Capture for 91Zr
Authors: de L Musgrove AR , Boldeman JW , Allen BJ , Harvey JA , Macklin RL
Published: June 2011

The neutron transmission through 91 Zr was measured at both the 80 and 200 m stations of ORELA and, in combination with a capture measurement at .the 40 m. station, has resulted in resolved resonance parameters below. 20 keV bombarding , energy. The average s-wave resonance parameters obtained were as follows: the average level spacing <D). = 640� 120 eV,. the neutron strength function 104S~ = O�36�0�10 and the average radiative width <r,). = 140�8 meV. For p waveS, the average parameters were: <D)p = 300� 50 eV, 104 SI =5' 7 � 1'0 and <r,)p = 220� 12 meV. A correlation between p-wave reduced neutron widths and radiative widths is found which is attributed to valence neutron transitions.
Properties of the Lowest T = 2 State in 24Mg
Authors: Heggie JCP , Bolotin HH
Published: June 2011

The lowest T = 2 state in 24Mg was investigated using the 23Na(p, )I)24Mg reaction. The excitation energies of this level and of the two lower T = 1 levels subsequently fed in its )I-ray decay were determined to be 15436�4�0�6, 10711�7�0�8 and 9967�S�0�5keV respectively. Accurate )I-ray decay branching ratios of these three levels were obtained, and a comparison was made with the analogous AT = 1 transitions in 24Na. From a simultaneous measurement of the radiative strength and the 23Na(p, (Xl )I)2�Ne strength, partial widths were deduced for the )I-ray, proton and (X-particle decays of the T = 2 level. The total width of the level was found to be 1� 02 � O� 34 keV.
Generalized Ohm's Laws for Relativistically Streaming Plasmas
Authors: Burman RR
Published: June 2011

A theoretical framework is given for treating energy dissipation and the associated diffusion of magnetic field lines resulting from 'frictional' interactions between different species in plasmas in which the species have relativistic streaming velocities. The plasmas are not necessarily neutral. One result is a form for generalized Ohm's laws. Details are given for binary plasmas, with particular attention paid to the analysis of inertial effects. Some remarks are made on the relevance of the results to pulsar magnetospheres.
Emission and Absorption of Langmuir Waves by Anisotropic Unmagnetized Particles
Authors: Melrose DB , Stenhouse JE
Published: June 2011

The emission and absorption coefficients for Langmuir waves due to anisotropic unmagnetized particles are reduced to two complementary forms: one involving integrals over momentum p and pitch angle ex; the other involving an integral over p and a sum over Legendre polynomials. The quasilinear diffusion coefficients are reduced to the former. It is also shown how the absorption coefficient may be reduced to forms involving neither a p derivative nor an ex derivative. The absorption coefficient is evaluated explicitly for five idealized anisotropic distributions, called a 'forwardcone' anisotropy, a 'semi-cos2 ex' anisotropy, a loss-cone anisotropy, a P, anisotropy and a P2 anisotropy respectively. All except the P2 anisotropy can lead to growth of Langmuir waves, but only if the distribution function is an increasing function of p at the resonant phase speed, e.g. only for gap distributions. The results have important implications in connection with the theory of solar radio bursts.
Mode Coupling in the Solar Corona. III. Alfvén and Magnetoacoustic Waves
Authors: Melrose DB
Published: June 2011

Coupling between Alfven waves and fast mode waves obliquely incident on a stratified medium is treated using the method of Clemmow and Heading (1954) within the framework of the cold plasma approximation. A result due to Frisch (1964) is rederived in the special case of vertical incidence. The coupling is strongest for nearly parallel (to the magnetic field lines) propagation, and the coupling ratio may be approximated by Q = (00 /0)" where 0 is the angle between the wave vector and the magnetic field lines, while og = A/L, with A the wavelength and L the scalelength of the inhomogeneity. This result may be of significance in connection with the heating of the solar corona by the dissipation of waves generated initially as acoustic waves in the photosphere, and perhaps with the propagation of hydromagnetic waves in the interplanetary medium.
A Radio Study of Abell Clusters
Authors: Mills BY , Hoskins DG
Published: June 2011

A search for radio sources close to 247 clusters of galaxies in the Abell catalogue has been carried out at the Molonglo Radio Observatory at a frequency of 408 MHz. A list of 116 sources near 89 clusters is given, identifications have been made and criteria for cluster membership have been established. A cluster luminosity function is derived in the range 1()23_1025 WHz-l SCi, and spectra have been obtained for sources in 25 clusters utilizing published surveys made at other frequencies. It is found that there is no correlation between the richness of a cluster and its inclusion of at least one radio source, but those clusters containing multiple sources are significantly richer than average.
Energy - Momentum Tensors for Dispersive Electromagnetic Waves
Authors: Dewar RL
Published: June 2011

Classical relativistic field theory is used as a basis for a general discussion of the problem of splitting up the total energy–momentum tensor of a system into contributions from its component subsystems. Both the Minkowski and Abraham forms (including electrostriction) arise naturally in alternative split-up procedures applied to a non dispersive dielectric fluid. The case of an electromagnetic wave in a (spatially and temporally) dispersive medium in arbitrary but slowly varying motion is then treated. In the dispersive case the results cannot be found by replacing the dielectric constant ε with ε(κ, ω) but include derivatives with respect to the wave vector κ and the frequency ω. Ponderomotive force expressions are obtained and the perturbation in the total energy–momentum tensor due to a one-dimensional wavepacket is found. A nonlinear Schrödinger equation is obtained for the evolution of a three-dimensional wavepacket. Both hot and cold plasmas are treated.
The Photoneutron Cross Section of Natural Osmium
Authors: Su Su , Sambell RH , Muirhead EG , Spicer BM
Published: June 2011

The absolute (y, xn) cross section of natural osmium is extracted from bremsstrahlung yield curves measured from the lowest (y, n) threshold of osmium isotopes up to 28 MeV in energy steps of 0�2 MeV. The VBPL method of Bramanis et al. (1972) has been used to unfold the cross section from bremsstrahlung yield data. The results do not show evidence of significant amounts of splitting of the giant dipole resonance, as might be expected from the theoretical predictions of Sedlmayr et al. (1974), but at the same time are not inconsistent with their general features.
Complementary assays reveal a relationship between HIV-1 uncoating and reverse transcription
Authors: Hulme Amy E. , Perez Omar , Hope Thomas J.
Published: June 2011

During the early stages of HIV-1 replication the conical capsid composed of p24
CA
protein dissociates from the rest of the cytoplasmic viral complex by a process called uncoating. Although proper uncoating is known to be required for HIV-1 infection, many questions remain about the timing and factors involved in the process. Here we have used two complementary assays to study the process of uncoating in HIV-1–infected cells, specifically looking at the timing of uncoating and its relationship to reverse transcription. We developed a fluorescent microscopy-based uncoating assay that detects the association of p24
CA
with HIV-1 viral complexes in cells. We also used an owl monkey kidney (OMK) cell assay that is based on timed TRIM-CypA–mediated restriction of HIV-1 replication. Results from both assays indicate that uncoating is initiated within 1 h of viral fusion. In addition, treatment with the reverse transcriptase inhibitor nevirapine delayed uncoating in both assays. Analysis of reverse transcription products in OMK cells revealed that the generation of early reverse transcription products coincides with the timing of uncoating in these assays. Collectively, these results suggest that some aspect of reverse transcription has the ability to influence the kinetics of uncoating.