Showing papers in "Nuclear Physics in 1969"

TL;DR: In this article, a modified oscillator model is used to calculate the nuclear potential energy surfaces as a function of deformations. And the average behavior of the surface is normalized to that of a liquid drop through the employment of a generalized Strutinsky prescription, and a synthesis of the single-particle model and the liquid-drop model is obtained.

TL;DR: In this article, it was shown that negative metric in quantum mechanics can lead to a unitary S-matrix, provided that all stable particle states are of positive square length.

TL;DR: In this paper, the surface delta interaction (SDI) operator is replaced by a generalized pairing interaction depending only on B and v. The favored pair is defined for each J as the specific superposition of two-particle states acted upon by this separable interaction, and B = 0, defines the number of nucleons not members of favored pairs.

TL;DR: In this article, a simple method was described to compute exactly the binding energy (B.E.) of the ground state of three nucleons in the framework of the Faddeev equations.

TL;DR: In this paper, the decay rates of spin 2+, 1+ and 0+ mesons were calculated in a quark rearrangement model with L excitation for the meson resonances.

TL;DR: In this article, a generalization of the Veneziano model to the N -point function was proposed which was crossing symmetric and bootstrap consistent in treating all particles as bound states of others.

TL;DR: In this article, the structure functions Fj which describe high-energy neutrino-nucleon scattering are discussed and a sum rule for F3 is derived assuming that F3 satisfies an unsubtracted dispersion relation.

TL;DR: In this article, it was shown that the presence of a complex pole in the upper half plane of the physical sheet leads to points of non-analyticity in the physical region, such that the values of the amplitude to either side of the point are not related by analytic continuation.

TL;DR: In this article, a non-local effective potential with five parameters was used to analyze the effect of strong interaction shifts and widths in pionic atoms on the vacuum polarization of the nuclei.

TL;DR: In this article, the Veneziano model for the binary meson reaction (n = 4), generalized by Bardakci and Ruegg and by Virasoro to n = 5, is further extended to the case of arbitrary n. The multi-resonance structure of the n-meson reaction is analyzed with the help of quark diagrams.

TL;DR: In this article, a slightly modified deformed nuclear single-particle potential was investigated in detail in the rare earth and actinide regions, and its parameters were determined so as to reproduce optimally the observed singleparticle level order in deformed nuclei.

TL;DR: In this article, a simplified version of the non-viscous irrotational liquid-drop model is proposed to account for the properties of the division of heavy nuclei at low excitation energies.

TL;DR: In this article, a new estimate of the contribution of hadronic contributions to the anomalous magnetic moment of the muon due to vacuum polarization corrections was made using recently reported results from the Orsay colliding beam experiments.

TL;DR: In this article, an integral representation of the generalized Veneziano amplitude for the n -meson reaction is constructed in such a way that all the external mesons appear on an equal footing and thus all the requirements of crossing symmetry are fulfilled.

TL;DR: In this paper, a detailed quark model calculation of the resonance contributions to the total, and backward differential, cross sections for single-pion photoproduction off nucleons is presented.

TL;DR: In this paper, a method suited for numerical computation was proposed for solving the nuclear independent-particle problem for axially symmetric nuclei, and the method was used to solve the nuclear nuclear independent particle problem.

TL;DR: In this article, it was shown that for a n −particle collision, the longitudinal phase-space distribution reduces to a manifold of dimension n −2, and the main properties of longitudinal phase space plots, the way in which relativistically invariant subenergies and momentum transfers vary along them, as well as the qualitative properties of reggeized multi-peripheral amplitudes.

TL;DR: In this paper, the authors measured the elastic scattering of 104 MeV alpha particles on 6 Li, 9 Be, 12 C, 14 N, 16 O, 20 Ne, 40 Ar, 64 Ni, 90 Zr, 124 Sn, 208 Pb and 209 Bi.

TL;DR: In this paper, the first excited 2+ states of 25 even-even isotopes of Ge, Se, Mo, Cd, Pd, Ru and Te were obtained using the ion implantation perturbed angular correlation technique.

TL;DR: In this paper, the authors considered the renormalization of the σ-model in the absence of the baryon fields, and showed that all divergences of the theory may be absorbed in two constants, the mass and the coupling constant.

TL;DR: In this paper, a single-particle potential appropriate for the description of the nuclear fission process has been investigated, which is based on a two-centre harmonic oscillator and includes the proper boundary condition for the ground state of the fissioning nucleus as well as for the two separated fragments.

TL;DR: Theoretical consequences of a two-humped fission barrier are developed and compared with experiment in this paper, where the existence of such states is reflected in subbarrier fission induced by neutrons in the resonance region, in the occurrence of broad resonance structures in the fission excitation functions, in anomalous fragment angular distributions and in the observed fission isomerism.

TL;DR: In this paper, spontaneous fissioning isomers have been discovered and assigned to 236U, 239Np, 236, 237, 240, 241, 242, 243Pu and 239, 241Am.

TL;DR: In this article, the effects of relativistic elastic unitarity on low-energy nucleon-nucleon scattering and the binding energy of nuclear matter were investigated and it was shown that relativism can increase the nuclear matter binding by approximately 0.5 MeV per particle over the value obtained for a non-relativistic potential having a similar shape and identical phase shifts.

TL;DR: In this paper, the angular distribution of the γ-rays from the 2′ → 2 transition by direct E2 Coulomb excitation has been obtained with an accuracy sufficient to establish the magnitude and sign of δ.

TL;DR: In this paper, ground state equilibrium deformations, deformation energies and quadrupole moments are calculated for even nuclei in the 28 < Z < 50, 50 < N 82 region.

TL;DR: In this paper, the particle-vibration(3−) coupling in the nuclei 209Bi and 209Pb was investigated by solving the differential equations, and the authors were able to explain most of the characteristic features of the particle vibration states in both nuclei.

TL;DR: In this article, the meson-theoretical approach to nuclear interaction currents is considered in the one-meson exchange approximation, and the effect of interaction currents on the nuclear dipole magnetic moment of odd-mass-nuclei with jj closed-shells plus (or minus) one nucleon is calculated within the framework of the pure spherical shell model.

TL;DR: In this paper, the rotational angular momenta of primary fission fragments were estimated for the fragment of mass 108 from the thermal neutron fission of 239 Pu, and the wave function of the bending mode excitation at the scission point was expanded in angular momentum components.

TL;DR: In this article, the large angle elastic proton-deuteron differential cross 1 GeV is calculated from a triangle graph, which includes as input the pp → πd amplitude, and a maximum in the 180° cross section is predicted for a proton kinetic energy of 700 MeV.