Showing papers on "Anomaly (physics) published in 1975"
TL;DR: In this article, two computationally feasible methods for determining the exponents from a given spectrum are described; they are essentially based on the generation of a system of linear equations, and the unknown coefficients in this system of equations are functions of the corner locations.
Abstract: The expressions for the spectra of both gravity and magnetic anomalies due to a two-dimensional structure consist of (except for a factor) sums of exponentials. The exponents of these exponentials are functions of frequency and the locations of the corners of the polygonal cross-section of the structure. Two computationally feasible methods for determining the exponents from a given spectrum are described in this paper; they are essentially based on the generation of a system of linear equations. The unknown coefficients in this system of equations are functions of the corner locations.The first method requires expansion of the exponentials in the expressions for the spectra in the form of a series and works reliably when the amplitudes of low frequencies are analyzed. The unknown parameters are determined fairly accurately with this method by suitable combinations of the spectra of the observed anomaly and its moments.The second method utilizes an exponential approximation technique for producing the system of linear equations. If only the spectrum of the anomaly is used, the system of equations becomes ill-conditioned in most cases resulting in grossly inaccurate solutions. However, particular combinations of the spectra of the anomaly and its first and second order moments are found to improve significantly the behavior of the system of equations and thus the quality of results.It has also been found that the mean values of corner locations can be calculated fairly accurately by taking the ratios of the spectra of the anomaly and its moments. Once the corner locations are found, computation of the density contrast in the case of a gravity anomaly and the magnetization contrast for a magnetic anomaly is straightforward.
149 citations
TL;DR: The role of colour and charm and heavy mirror fermions was explored in interpreting the J/ψ particles, the Kolar-mine events and the neutrino-antineutrino anomaly.
90 citations
TL;DR: In this article, the specific heat due to spin fluctuations in itinerant ferromagnets is calculated by using the renormalized spin fluctuation theory of Moriya and Kawabata.
Abstract: The specific heat due to the effect of spin fluctuations in itinerant ferromagnets is calculated by using the renormalized spin fluctuation theory of Moriya and Kawabata. The calculation continuously covers all the interesting temperature ranges, both below and above the Curie temperature. The specific heat is shown to be generally enhanced in weakly and nearly ferromagnetic metals. This is particularly so at low temperatures and the effect decreases as temperature goes up far more rapidly than the previous results based on the random phase approximation which generally over-estimates the spin fluctuation effect. An anomaly around the Curie temperature turns out to be rather small.
82 citations
TL;DR: In this paper, the effect of displacive phase transition on electrical transport properties is investigated in a p-type single crystal of SnTe with carrier concentration of 1.2 × 10 20 /cm 3 at 77 K.
54 citations
TL;DR: The 584 A photoelectron spectra of S2 and Te2 were reported in this paper, and the features of the S2 spectrum are analogous to those in the O2 spectrum, and hence the states of S 2+ are assigned in corresponding fashion.
Abstract: The 584 A photoelectron spectra of S2 and Te2 are reported. The features of the S2 spectrum are analogous to those in the O2 spectrum, and hence the states of S2+ are assigned in corresponding fashion. However, in the spectrum of Te2 anomalous intensities are apparent. The relative intensities of the peaks assigned to 2Πg,1/2 and 2Πg,3/2 are in the ratio 10:1, whereas in O2 they are approximately equal. Some of the other anticipated peaks are either absent or very weak. An analysis is presented to account for this anomaly, based on Hund’s case‐c coupling.
47 citations
TL;DR: In this article, the RGM potentials were determined by directly unfolding the associated integral kernels of the generator coordinate method, which confirmed the concept of quasi-molecular rotational states which has been used to account for the backward angle anomaly observed in elastic α-40 Ca cross sections.
44 citations
Patent•
04 Sep 1975
TL;DR: In this paper, a Borehole orienting apparatus is provided where motion is imparted to a permanent magnet assembly to generate a moving magnetic field and receiver means are provided such that measurable signals are induced therein when the magnetic field is distorted due to the presence of a ferrous anomaly.
Abstract: Borehole orienting apparatus is provided wherein motion is imparted to a permanent magnet assembly to generate a moving magnetic field and receiver means are provided such that measurable signals are induced therein when the magnetic field is distorted due to the presence of a ferrous anomaly. The receiver means is rotated to produce an azimuthal scan such that there are induced in the receiver means signals from which the azimuthal location of the anomaly can be determined.
26 citations
TL;DR: In this paper, the hadronic part of the muon g-factor anomaly was evaluated from the latest data on σ (e + e − → hadrons) for a p-wave ππ scattering length of a 1 = 0.04±0.005, compared to a (experiment) − a (QED) = (60±29) × 10 −9.
22 citations
Journal Article•
22 citations
TL;DR: A lambda anomaly was observed in the nuclear heat capacity of a single crystal of praseodymium known not to order down to 1.8 K as discussed by the authors, which was associated with a cooperative magnetic ordering of the hexagonal-site nuclei at 25--30 mK of the type discussed by Murao.
Abstract: A lambda anomaly was observed in the nuclear heat capacity of a single crystal of praseodymium known not to order down to 1.8 K. The anomaly is associated with a cooperative magnetic ordering of the hexagonal-site nuclei at 25--30 mK of the type discussed by Murao. This result is in contrast to earlier calorimetric measurements where ionic order has precluded cooperative nuclear processes. The cooperative anomaly is suppressed by a field of 1.5 T. (AIP)
19 citations
TL;DR: In this paper, the depolarization factor of light scattered by CO 2 at the critical density has been investigated and a large critical anomaly has been observed, which is attributed to secondary scattering.
TL;DR: Magnetic susceptibilities, electrical resistivities and thermoelectric powers of liquid In-Bi alloys are measured in this article, and the curve of the electron susceptibility versus composition shows a little anomaly.
Abstract: Magnetic susceptibilities, electrical resistivities and thermoelectric powers of liquid In-Bi alloys are measured. The curve of the electron susceptibility versus composition shows a little anomaly...
TL;DR: The quasi-one-dimensional conductor K 2 Pt/CN/Br 0.3 ·3H 2 (KCP) exhibits a specific heat anomaly in the temperature range around 123 K as discussed by the authors.
TL;DR: The specific heat of bcc 3 was measured from 25 mK to near the melting curve, with particular attention given to the region of the low-temperature anomaly, T ≲ 500 mK as mentioned in this paper.
Abstract: The specific heat of bcc 3
He has been measured from 25 mK to near the melting curve, with particular attention given to the region of the low-temperature anomaly, T ≲ 500 mK The data have been analyzed in various ways to show the temperature and molar volume dependence of the specific heat In the region of the anomaly the specific heat has a term linear in T, in addition to a T
3 term The data at the lowest temperatures for two large-molar-volume bcc 3
He samples have been used to determine the nuclear exchange energy J The values of J found are in agreement with previous results
TL;DR: In this article, the existence of the axial anomaly and the non-renormalization theorem for this anomaly are consequences of conformal symmetry at small distances, focusing in particular on the implementation of the conformal group.
Abstract: We discuss symmetry at small distances, focusing in particular on the implementation of the conformal group. In the framework of a theory which generates strong interactions from a non-Abelian gauge group, we show that the existence of the axial anomaly - which determines the amplitude for $pi$$sup 0$ $Yields$ 2$gamma$ - as well as the nonrenormalization theorem for this anomaly are consequences of conformal symmetry. (AIP)
TL;DR: An apparent anomaly in the absorption spectrum of Ba I near the 4d threshold was explained using Hartree-Fock intermediate-coupled wavefunctions in this paper, where the authors used the HartreeFock wavefunction to calculate the J=1 states of BaI 4d94f.
Abstract: An apparent anomaly in the absorption spectrum of Ba I near the 4d threshold is explained using Hartree-Fock intermediate-coupled wavefunctions. Calculated oscillator strengths are presented for the J=1 states of Ba I 4d94f.
TL;DR: In this article, the superconducting anomaly was observed in the temperature slope of C at T 4 H 15 and the γ-coefficient of electronic heat capacity is smaller and the Debye-temperature larger than that of pure Th, respectively.
TL;DR: In this article, the thermal expansion coefficient of MnB has been measured in the temperature range from 0 to 420°C and an Invar type thermal expansion is observed, which is the first measurement of Invar-type thermal expansion.
TL;DR: In this paper, the many-current Ward identities corresponding to Gell-Mann current algebra are discussed in the renormalized σ model and the uniqueness of the Adler-Bardeen anomaly is proved using the Wess-Zumino consistency conditions.
Abstract: The many-current Ward identities corresponding to the Gell-Mann current algebra are discussed in the renormalized σ model. The Ward identities are verified in the case of the SU(2)×SU(2) chiral symmetry. In the SU(3)×SU(3) case the uniqueness of the Adler-Bardeen anomaly is proved using the Wess-Zumino consistency conditions.
TL;DR: A thermal expansion anomaly similar to that of the invar alloy was observed in a Laves phase intermetallic compound, Zr0.7Nb0.3Fe2 as discussed by the authors.
TL;DR: In this paper, a phenomenological two-branch excitation spectrum was constructed by the structure of a theory of boson pairing similar to the BCS theory of fermions, and the low-temperature specific heat was calculated within the model and compared with experimental data.
Abstract: It is suggested that the long-wavelength excitation spectrum of superfluid $^{4}\mathrm{He}$ may consist of a branch of quasiparticle excitations which has a gap at zero momenta in addition to a branch of hydrodynamic phonons. A phenomenological two-branch spectrum is constructed. The model is suggested by the structure of a theory of boson pairing similar to the BCS theory of fermions. The low-temperature specific heat of $^{4}\mathrm{He}$ is calculated within the model and compared with experimental data. It is found that a two-branch-model excitation spectrum can describe the low-temperature anomaly in the specific heat without contradicting existing direct measurement of the excitation spectrum. Some features of a possible microscopic theory of the two-branch spectrum are discussed, and the possibilities of making direct measurements testing the idea of a two-branch excitation spectrum are considered.
TL;DR: In this paper, the linear antiferromagnet CsNiCl3 showed an anomaly at TN=4.36 K, consistent with the exponent η=43 for an anistropic three-dimensional system.
TL;DR: This paper, which is based on the Martindale-Giesekus yarn model, points out recent advances in research on point processes, extends them where necessary, and so provides a solution to the problem of estimating the statistical anomaly of the underlying point process of fiber end points.
Abstract: This paper, which is based on the Martindale-Giesekus yarn model, points out recent advances in research on point processes, extends them where necessary, and so provides a solution to the problem of estimating the statistical anomaly of the underlying point process of fiber end points. It is argued that estimating the anomaly (a function) is the natural extension and refinement to estimating Huberty's κ (a constant), and therefore the proper method of measuring yarn irregularity. The estimators of 1 — κ are in fact estimators of the anomaly at argument zero.
TL;DR: In this paper, the absence of radiative corrections to the axial vector anomaly in non-Abelian gauge theories of strong interactions was shown, and it was shown that such corrections are not necessary.
Abstract: We show the absence of radiative corrections to the axial-vector anomaly in non-Abelian gauge theories of strong interactions.
TL;DR: In this article, the Schottky barrier tunnel junctions were used to obtain tunneling densities of states in degenerate n-type Ge and n-Type Si by a method similar to that of Conley et al., but with a higher order approximation.
Abstract: Tunneling densities of states in degenerate n-Type Ge and n-Type Si are obtained by using Schottky barrier tunnel junctions by a method similar to that of Conley et al., but with a higher order approximation. It is shown directly by tunneling that tailings of (111) and (000) bandgaps occur in the same manner. Zero bias anomaly of V-type conductance which has often been found in tunnel junctions of III–V compounds is also observed in some MIS tunnel junctions made on degenerate n-Type Ge and n-Type Si, depending on the thickness of the insulating layer. It is difficult to explain this anomaly in terms of TA phonon excitation by tunneling electrons, as the explanation for this anomaly.
CERN1
TL;DR: The value of the 18 diagrams of eoghth order, containing second order vacuum polarization and scattering of light-by-light insertions, gave a value of (111.1 ± 8.1) × (α/π) 4 as mentioned in this paper.
CERN1
TL;DR: In this paper, the authors analyzed the recently observed doubly radiative n-p capture and showed that the experimental result is impossible to explain within the present theoretical framework, and that it cannot explain the experimental results.