The Institute of Physics ( IOP ) по журналам "Journal of Physics A: Mathematical, Nuclear and General"
Отображаемые элементы 120 из 508

(19740411)The effect of modifying the absorption model, as suggested by Guerin (1972) to give Regge cuts with the correct branch point behaviour is investigated. The integrals are reduced to a form which makes application of the ...

(19730401)The authors derive the first member of a hierarchy of integrodifferential equations relating the density functions of a polymer with excluded volume. This equation is derived by a route completely analogous to the ...

(19740101)The absolute sea level differential cosmic muon spectra at zenith angles 45 degrees and 60 degrees in the western azimuth have been determined near the geomagnetic equator (at 12 degrees N) by using the range spectrograph ...

(19741101)A new method for the determination of absolute Kconversion coefficient is described. The Kconversion coefficients of the 569.7 keV and 1063.6 keV gamma rays in the decay of 207Bi(38 yr) and 316.5 keV gamma ray in the ...

(19730701)The fraction fA of the incident beta particles from a pure beta source that are completely absorbed in a foil of thickness t is measured with an endwindow GM counter for 32P, 91Y and 89Sr beta sources using different ...

(19740721)Perrin has considered the direction I of a line in a body which is subject to a large number of elementary rotations and obtained an exact expression for the resulting probability distribution of I. Fisher has developed a ...

(19730801)A connection between the reality type of a group representation, and the symmetrized and antisymmetrized squares of that representation is noted. The correspondence leads to a simple reality test for space group representations. ...

(19730201)Difference equations are derived for the Laplace transforms of the time dependent probability amplitudes of a system consisting of a single photon interacting with a single twolevel atom in the electric dipole approximation. ...

(19730401)Upper and lower bounds are established on the secondorder energies of excited stationary states of an atom by a coordinate free analysis of suitably modified Hylleraas functionals. The work proves more rigorously and ...

(19730101)The development of the theory of direct pair production by relativistic muons is traced in an attempt to reconcile the existing theoretical expressions for the cross section. The interrelation of the theoretical treatments ...

(19730801)Starting from a canonical quantum field theory model and imposing invariance of the theory under a group, acting nonlinearly on the fields, a groupinvariant energymomentum tensor of the Sugawara form is constructed which ...

(19730701)The degeneracies in the energy levels of the n dimensional anisotropic harmonic oscillator are examined and related to the representations of SU(n). The space on which the oscillator acts is then decomposed so that the ...

(19730601)The electromagnetic decay scheme of 40K below an excitation of 3.2 MeV has been measured using the 37Cl( alpha ,n)40K reaction in conjunction with both a Si(Li)Ge(Li) and a Ge(Li)NaI(Tl) coincidence system. Gamma ray ...

(19740321)A simple unified procedure, based on a generalization of a method first used by Weinstein in 1934, yields effective lower and upper bounds to energy levels and overlap integrals of quantummechanical systems. A further ...

(19740211)A lagrangian derivation of the field equations expressing the gravitational effect of a nongravitational field usually necessitates the introduction of a field external to the geometry. It is shown, that in the case of a ...

(19741211)Graphs associated with the Gel'fandYaglom equations for arbitrary spin are used in a simple method to find the number of conditions which a good quantizable freefield theory must satisfy. The number of conditions is seen ...

(19731101)A local 1S0 pp potential is introduced. This potential has an interesting shape and gives phase shifts for pp scattering which are in very good agreement with the experimental phase shifts.

(19740321)It is shown that a nonlinear integral equation for turbulent energy transport may be reinterpreted in terms of a Heisenbergtype effective viscosity. A new equation is derived for the effective viscosity. This is found to ...

(19740101)Cross sections for alpha capture to the giant dipole resonances of 1d2s and 1f2p shell nuclei are shown to be in agreement with HauserFeshbach calculations. Isospin mixing in 28Si, 32S and 40Ca is discussed. It is shown ...

(19740211)Angular distributions have been measured for the reaction 28Si( alpha , gamma 0)32S in the energy range Ex=1218 MeV and the cross sections for exciting 1 and 2+ states deduced. These data together with similar data for ...
Отображаемые элементы 120 из 508