Showing papers in "Nuclear Physics in 1971"

TL;DR: In this paper, a dual-resonance model of mesons is constructed through the use of creation and annihilation operators having simple anticommutation properties as well as harmonic-oscillator type operators of the conventional model.

TL;DR: Renormalizable models are constructed in which local gauge invariance is broken spontaneously and can be found by means of a path integral method, and they can be checked by algebra as discussed by the authors, which can serve as a renormalizable theory for ϱ-mesons and photons.

TL;DR: The problem of renormalization of non-gauge invariant regulator fields is studied in this paper, where it is shown that in the limit of high regulator mass gauge invariance can be restored by means of a finite number of counterterms in the Lagrangian.

TL;DR: For the massless Yang-Mills field, a generalized Ward-Takahashi identity was derived in this paper, which implies that Z 1 / Z 2 has a common value for the vector field and for the "fictious" scalar field.

TL;DR: In this article, the authors describe the energy of nuclei in the free neutron regime by a compressible liquid-drop model designed to take into account three important features: (i) as the density increases, the bulk nuclear matter inside the nuclei, and the pure neutron gas outside the nucleus become more and more alike; and (ii) the presence of the neutron gas reduces the nuclear surface energy.

TL;DR: In this paper, the authors measured the cross section for elastic electron-deuteron scattering for ten four-momentum transfers squared in the range 5 fm −2 2 fm−2.

TL;DR: In this article, the authors derived infinitesimal generators of new field transformations which leave the action integral invariant, such as those obtained by Neveu and Schwarz, in the context of the functional integral formulation.

TL;DR: In this paper, the energy levels of A = 16 and 17 nuclei were compared with the information about the structure of the A = 17 and A = 14 systems, with emphasis on material leading to information about their structure.

TL;DR: In this paper, the one-pion-exchange process is separated into Born and non-Born parts corresponding respectively to the Born and NonBorn parts in the process of weak or photoproduction of a pion by the nucleon.

TL;DR: In this paper, the collective potential energy surfaces of doubly even nuclei can be obtained either by calculation from microscopical models or directly from the experimental low-energy spectra.

TL;DR: In this paper, the shape of the transuranium nucleus in the zeroth-order approximation is taken to be the Cassinian ovaloid, the deviation being expanded in a series of Legendre polynomials.

TL;DR: In this paper, it was shown that if a pair of nucleons with J = 0 is distributed with unequal amplitudes over several j-orbits, then a constant separation between the ground state and ν = 2 states, independent of the number of pairs, follows.

TL;DR: In this paper, a set of master equations describing the equilibration process and utilizing Williams' transition-rate expressions are presented to study the occupation probabilities and the instantaneous and time-integrated particle energy spectra as a function of the time elapsed from the initial target-projectile interaction.

TL;DR: Invariant regularization of non-linear chiral Lagrangians is constructed in this paper, which satisfies charge algebra constraints, threshold theorems and is unitary at sufficiently small energies.

TL;DR: In this paper, the radiative corrections to lowest order for the reactions e + e − giving any final state f, different from e+ e −, are calculated, taking into account the contributions coming from the photons emitted by the electrons.

TL;DR: In this article, a new method is used to derive an accurate but simple formula for the state density for fixed numbers of particles and holes in the uniform spacing model, which is extended to the case where two kinds of particles are present.

TL;DR: In this paper, a linked-diagram expansion for the model-space effective Hamiltonian is derived, which contains the folded diagrams and is independent of the energy eigenvalue.

TL;DR: In this paper, a generalization of the results about short distance (xμ → 0) behaviour in quantum field theory is presented, where the authors show that the light cone behaviour is similar to the one described in this paper.

TL;DR: In this article, a formulation of the parton picture of current interactions is given without recourse to perturbation theory and the relation between the rate of decrease of the nucleon form factors and the behaviour of νW2 near ω = 1 is shown to depend upon further specific properties of parton-nucleon dynamics and so to be model dependent.

TL;DR: In this paper, the energy of the neutron gas is studied with the Reid and Bressel-Kerman-Rouben soft core potentials up to a density of 4.5 neutrons fm 3, and very approximate estimates for neutron gas and solid energies are presented also for the Hamada-Johnston hard core potential.

TL;DR: In this article, an extension of the boson representations of Holstein and Primakoff and Dyson for spin operators is given for the case of fermion pair and density operators.

TL;DR: The existence of the norm for the proton is also established for neutrons as discussed by the authors, and it is proved that the definitions of the norms given by Berggren and Romo are identical, with any convergence factor of the form exp (−er n ) [1 1 2 π/ arctg (γ/gk)] leading to the same result.

TL;DR: In this paper, it is shown that in the limit of vanishing electron mass m transitions forbidden by γ 5 invariance give a non-vanishing contribution to the imaginary part of the triangle graph.

TL;DR: In this article, it was shown that in the zero-slope limit, the unitarized dual resonance model reduces to the φ 3 theory, where φ is a constant.

TL;DR: In this article, a sample of approximately 250 Λp interactions has been obtained in the Λ-hyperon momentum range of about 300 to 500 MeV/c, and an enhanced Λhyperon production rate was obtained by exposing an internally-mounted platinum target to the incident 1.5 GeV/C meson beam.

TL;DR: In this paper, a discussion of the important dynamical factors influencing the yield in heavy-ion transfer reactions at energies below the Coulomb barrier is presented, together with illustrations of calculations for various targets and beams.

TL;DR: In this paper, the functional for the one-loop diagrams for the non-linear chiral invariant pion Lagrangian is calculated invariantly using methods strongly reminiscent of gauge-invariant renormalization techniques in QED.

TL;DR: In this paper, a sample of some 7500 K − meson captures at rest on hydrogen in emulsion giving rise to charged Σπ pairs was used to determine r, the decay branching ratio of the Σ + hyperon, λ, the ratio of Σ − to Σ+ hyperon production, τ Σ−, the lifetime of the ǫ − hyperon and C 10 −12 sec.

TL;DR: In this article, a modified expansion of the electron radial wave functions is derived by means of the integral equations which correspond to the Dirac radial differential equations, and the implications of the new formulae for the analysis of experiments are discussed.

TL;DR: In this article, the average nuclear charges of the primary fragments represented as a linear function of their pre-neutron-emission mass (charge division) and the width of the charge distribution about the average values (charge dispersion) were obtained.