Showing papers in "Nuclear Physics in 1966"

TL;DR: In this article, a semi-empirical theory of nuclear masses and deformations is presented, where the potential energy of a nucleus, considered as a function of N, Z and the nuclear shape, is given by the liquid-drop model, modified by a shell correction.

TL;DR: In this paper, the authors investigated the applicability of the free nucleon-nucleon potential determined by the scattering data in the shell-model description of finite nuclei.

TL;DR: In this article, the effect of both electronic and atomic collisions on the velocity of an ion in a scattering medium is calculated as a function of time and the average scattering angle resulting from multiple atomic collisions is derived.

TL;DR: In this article, the measured elastic scattering of 24.7 MeV alpha particles from the nuclei O, Mg, Al, Si, Ca, Ma, Ni, Co, Cu, Ge, Zr, Ag, In, Sn, Hf, W, Au, Bi and U has been analyzed using the optical model.

TL;DR: In this paper, a compilation of energy levels for A = 11-12 nuclei with emphasis on material leading to information about the structure of the A =11-12 systems is presented.

TL;DR: In this paper, the authors obtained an l-dependent α-α potential from fitting the relevant phase shifts for c.m. energies ⪅ 12 MeV for the nuclear part of the potentials, a superposition of repulsive and attractive Gaussian shapes was used.

TL;DR: In this paper, the low-lying even-parity spectrum of 16O and 17O is described by mixing the usual states in the spherical shell model with deformed states obtained by exciting particles out of a deformed core.

TL;DR: In this article, intermediate coupling shell-model calculations with a simple effective interaction between nucleons are used to fit observed properties of the nuclei with mass numbers A = 6-9.

TL;DR: In this article, the energy levels of the Nb, Mo and Tc isotopes with a neutron number N between 50 and 56 are first calculated under the assumptions that their protons and neutrons outside Z = 40 and N = 50 are in the 1 g 9 2 and 2 d 5 2 orbits, respectively, and that the effective nucleon- nucleon interactions are given by the experimental spectra of 92Mo, 92Zr and 92Nb.

TL;DR: In this article, a good description of the known collective and non-collective odd-parity levels of 208Pb may be obtained in terms of particle-hole excitations, with an interaction deduced from the spectroscopy of lighter closed shell nuclei.

TL;DR: In this article, the authors measured the differential cross section of 20 GeV protons scattered elastically and quasi-elastically by a series of nuclei, ranging from Li to U.

TL;DR: In this paper, a DWBA treatment of the heavy-ion neutron transfer reaction is given which is suitable for energies below the Coulomb barrier where the transition amplitude may be evaluated with reasonable accuracy.

TL;DR: In this paper, the generator wave function which serves as a weight function is obtained by solving an integral equation derived through the variational principle, where there appear overlap and energy kernels, which are matrix elements between shell-model wave functions with different values of the deformation parameter.

TL;DR: In this article, a relation between the well known lowering of the rotational g R factors and the magnetic dipole transitions is established, assuming that the proton distribution in nuclei is somewhat less deformed than the neutron distribution because the pairing force acting between protons is larger than that acting between the neutrons.

TL;DR: In this paper, the authors studied quasi-free proton-proton scattering in a number of light nuclei at 460 MeV using two large identical magnetic spectrometers with two-directional focussing and a multi-channel electronic detector system.

TL;DR: In this article, a comprehensive table of energy levels of a single particle in a Nilsson well has been computed, using as a basis the coupled representation |j, j3〉, and the energy levels are also shown in graphs as a function of the nuclear deformation.

TL;DR: In this paper, the relative differential (t, p) cross sections for the strongest L = 0 transitions in the various isotopes were measured by means of a target composed of approximately equal amounts of the various even Ca isotopes.

TL;DR: In this article, the energy levels of the nuclei with 20 ≦ Z ≦ 28, N = 29 and 30 are calculated under the assumptions that their protons and neutrons outside Z = 20 and N = 28 are in the 1 f 7 2 and 2 p 3 2 orbits, respectively, and that the effective nucleon-nucleon interactions are given by the experimental spectra of the nucleus with the same Z but N =28, of 56Co and 58Co.

TL;DR: In this article, the differential cross section for the scattering of neutrons by α-particles has been measured at neutron energies between 6 and 30 MeV, including the region of the 22.16 MeV resonance.

TL;DR: In this paper, the SU3 symmetry and the super-multiplet provided a very good way of truncation, and this truncation was used to calculate level schemes of many nuclei beyond 20Ne.

TL;DR: In this paper, the authors give an analytic procedure for the explicit construction of the states in the U 3n ⊃ U 3 × U n, U 3 ∈ R 3 ⊆ R 2, Un ∈ Un−1 ∈ On−1 ⊈ Sn ∈ U1 chain o subgroups, where the 3n dimensional unitary group U3n is the symmetry group of the Hamiltonian, R 3 is the ordinary rotation group, and Un is the unitary groups in n dimensions associated with the particle indices.

TL;DR: In this paper, the Hartree-Fock approximation for the closed-shell nuclei 16O, 40Ca and 80Zr has been studied in detail and the wave functions, energy levels, binding energies and density distributions for the six nuclei were obtained.

TL;DR: In this article, a shell model is used to investigate quantitatively some odd-parity levels of nuclei in the range 33S−41Ca. The interaction matrix elements are reduced to linear expressions in 14 parameters (i.e. 12 two-particle interactions and two binding energies to the core).

TL;DR: In this article, the one-particle fractional parentage coefficients for totally antisymmetric states of n identical fermions have been calculated by diagonalizing the Casimir operators of the unitary and symplectic groups.

TL;DR: In this article, a general formulation of the direct inelastic scattering problem is presented, which is applicable to collisions between a nuclear projectile having mass number A ≦ 4 and any target nucleus for which a shell model description can be given.

TL;DR: In this article, the application of a previously derived formalism to a microscopic description of the inelastic and charge exchange scattering of various projectiles by nuclei is discussed and the problem is reduced to the evaluation of certain nuclear form factors.

TL;DR: In this paper, the 2p→1s and 3d→2p spectra were analyzed in terms of a two-parametric charge distribution of the Fermi type by solving the Dirac equation numerically.

TL;DR: In this article, the available data for the elastic scattering of deuterons by 12 C for energies from 3 to 34 MeV are analyzed in terms of the optical model including spin-orbit coupling.

TL;DR: In this paper, the pairing plus quadrupole model was used to calculate the isotope and isomer shifts of the nuclear charge radius using a core plus a few valence particles.