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Showing papers on "Nuclear matter published in 1976"


Journal ArticleDOI
TL;DR: In this article, the authors combine the many-body theory and the low-density expansion developed by Brueckner, Bethe and others to investigate several properties of the ground state and of single-particle excited states of symmetric nuclear matter.

522 citations


Journal ArticleDOI
TL;DR: In this article, the M.I.T. bag model of hadrons was used to show that a neutron matter-quark phase transition is energetically favorable at densities around ten to twenty times nuclear matter density.

314 citations


Journal ArticleDOI
TL;DR: In this paper, the Hartree-Fock theory is applied to the large amplitude dynamics of slabs of spin and isospin symmetric nuclear matter, and the results evidence a wide variety of dynamic phenomena, including fusion, compound nucleus formation, dissipation, strongly damped collisions, and fragmentation.
Abstract: The time-dependent Hartree-Fock theory is applied to the large amplitude dynamics of slabs of spin and isospin symmetric nuclear matter. The slabs are translationally invariant in two transverse dimensions, and with the simplified effective interaction used in this work, the problem is reduced to a set of coupled nonlinear equations for time-dependent functions of a single spatial variable. By specification of appropriate initial conditions, large amplitude oscillations of a single slab, the scattering of a slab from an external potential barrier, and collisions of two slabs have been investigated. The results evidence a wide variety of dynamic phenomena, including fusion, compound nucleus formation, dissipation, strongly damped collisions, shock wave propagation, and fragmentation. The microscopic aspects of the dynamics, the relation to fluid mechanics, and the practical and conceptual problems arising from the theory are discussed in detail.

235 citations


Journal ArticleDOI
TL;DR: In this paper, it was shown that the energy of the monopole resonance is proportional to the square root of the compression modulus of finite nuclei K A, which is a regular function of K ∞ and is a possible way of reaching the compressibility of nuclear matter.

189 citations


Journal ArticleDOI
TL;DR: In this article, the temperature dependence of liquid drop model parameters and geometrical properties of nuclei were investigated using the thermal Hartree-Fock approximation, and explicit numerical expressions for the temperature properties were given for the various quantities.

188 citations


Book
01 Jun 1976
TL;DR: In this article, the Hartree-Fock and particle-hole formalisms and random phase approximation are applied to the three-nucleon problem, and the authors present a theory of the structure of light nuclei.
Abstract: Introduction. I. Two- and Three Nucleon Systems . The nucleon-nucleon interaction. Phase shift analysis. Varieties of nucleon-nucleon interactions. The three-nucleon problem. II. Nuclear Matter . Formal theory of many-particle systems. Infinite nuclear matter. III. Theories of the Structure of Light Nuclei. Hartree-Fock and particle-hole formalisms and the random phase approximation. Application of the Hartree-Fock and the particle-hole formalisms. Nuclear rotation. IV. Theories of the Structure of Heavier Nuclei. Pairing and quasiparticles. Collective motion in nuclei. Appendices: A. The projection of physical states. B. Collective coordinates in a consistent microscopic theory. References. Index.

86 citations


Journal ArticleDOI
TL;DR: In this article, the expression for the quasiparticle effective mass in Landau's theory for normal Fermi liquids is generalized to asymmetric nuclear matter and applied to the liquid phase of a neutron star.

75 citations


Journal ArticleDOI
01 Dec 1976
TL;DR: In this paper, the pion spectrum in dense nuclear matter for finite temperatures is calculated and the critical temperature that marks the beginning of a second order phase transition due to pion condensation is given in a phase diagram.
Abstract: We calculate the pion spectrum in dense nuclear matter for finite temperatures. The critical temperatureTc(ρ) that marks the beginning of a second order phase transition due to pion condensation is given in a phase diagram. We show that in heavy ion collisions, pion condensation should occur, leading to an enhancement in the formation of nuclear shock waves.

61 citations


Journal ArticleDOI
TL;DR: In this article, the pair-correlation operator fij in the variational wave function of nuclear matter is generated from a two-body Schrcdinger equation with boundary conditions which require the correlated wave function to heal at a distance d. The two body cluster energy is calculated exactly, while the fij is approximated by a sum of central, spin, isospin and tensor correlation operators to evaluate the many-body cluster contributions.

56 citations


Journal ArticleDOI
TL;DR: In this article, a non-local energy-dependent self-consistent kaon-nucleus optical potential is derived for kaonic atoms, and the sensitivity of the results to changes in parameters of the nuclear matter distribution is studied.

45 citations


Journal ArticleDOI
TL;DR: In this paper, the authors considered heavy-ion collisions with beam energies of a few hundred MeV/nucleon, and they investigated a microscopic, rapid (and therefore economical) simulation method.
Abstract: We consider heavy-ion collisions with beam energies of a few hundred MeV/nucleon, because such collisions seem favorable for producing compressed nuclear matter. As an alternative to hydrodynamic ways of calculating such collisions, we are investigating a microscopic, rapid (and therefore economical) simulation method. There are two simplifications basic to this method: (i) using classical particle kinematics, and (ii) taking nucleonnucleon interactions into account via cross sections rather than explicit forces. Some other simplifications, concerning nuclear binding etc., are presently crude but will be improved. Even at normal density, nuclear matter is not so dilute; therefore our calculations show some sensitivity to details of the mechanism assume for nucleon-nucleon scattering. For head-on collision of two mass-235 nuclei, our present calculations yield maximum densities between 2 and 3 times that of normal nuclear matter.

Journal ArticleDOI
TL;DR: In this paper, the ground-state energy of densities up to and beyond nuclear matter density is calculated using a lowest-order constrained variation (LOCD) method. But the results are not consistent with the results obtained in this paper.

Journal ArticleDOI
TL;DR: In this article, a set of linear equations is derived from which the values of the deformation parameters can be calculated from the Landau parameters of the spin dependent terms in the quasi-particle interaction in nuclear matter.

Journal ArticleDOI
TL;DR: In this article, a fully relativistic quantum many-body theory is applied to the study of a model high-density matter which qualitatively describes known nuclear matter and results pertaining to the equation of state of neutron matter, neutron star mass, vacuum fluctuation corrections, collective modes, exchange energies, and correlation energies are reported.

Journal ArticleDOI
TL;DR: In this article, a simplified model for the scalar meson self-energy in the nuclear medium and restricting to a set of graphs which in non-relativistic normal nuclear matter reduces to the well-known random phase approximation (RPA) was used to determine whether strongly attractive multi-body forces are present or absent in the normal matter.

Journal ArticleDOI
TL;DR: In this article, the Brueckner theory was used in place of the perturbation theory employed previously to estimate the binding energy of nuclear matter, which was shown to contribute only about 0.8 MeV/A to the nuclear binding energy.


Journal ArticleDOI
TL;DR: In this article, the binding energy of nuclear matter was calculated using the Jastrow variational approach using different types of constrains and including all the contributions from hypernetted-chain diagrams.

01 Mar 1976
TL;DR: In this article, the binding energy of nuclear matter was calculated using the Jastrow variational approach using different types of constrains and including all the contributions from hypernetted-chain diagrams.
Abstract: Abstract Employing two model central interactions the binding energy of nuclear matter is calculated within the framework of the Jastrow variational approach using different types of constrains and including all the contributions from hypernetted-chain diagrams.

Journal ArticleDOI
TL;DR: In this paper, meson exchange corrections to the binding energy as a function of the density of nuclear matter and neutron matter are presented for both nuclear and neutr neutrons, and it is shown that these corrections give a repulsion in nuclear matter yielding about 5 MeV less binding at the saturation point.


Journal ArticleDOI
TL;DR: In this paper, a constrained variational calculation for the binding energy of nuclear matter using the Reid soft core interaction and with tensor correlations treated exactly, is presented, achieving Saturation at a density given by k F ≈ 1.75 fm −1 with a binding energies of 22 MeV per nucleon.

Journal ArticleDOI
TL;DR: The cluster expansion treatment of antisymmetry, as used in most Jastrow-theoretic calculations to date for Fermion systems, is shown to be seriously inadequate.

Journal ArticleDOI
TL;DR: In this article, a nucleon mean free path in nuclear matter longer than that deduced from the Fermi gas model and free nucleon-nucleon cross sections is assumed.

Journal ArticleDOI
TL;DR: In this article, the particle-ladder diagrams up to third order in the basic interaction are calculated for nuclear matter with some recent local soft-core potentials, and a detailed comparison to the G-matrix results is carried out.

Journal ArticleDOI
01 Mar 1976
TL;DR: Differential cross sections for elastic and inelastic scattering of 104 MeVα-particles from204,206,208Pb were measured with high angular accuracy in this article, where the experimental results were analyzed on the basis of a semimicroscopic folding model in order to determine the matter distributions at the nuclear surface and the transition densities.
Abstract: Differential cross sections for elastic and inelastic scattering of 104 MeVα-particles from204,206,208Pb were measured with high angular accuracy. The experimental results were analysed on the basis of a semimicroscopic folding model in order to determine the matter distributions at the nuclear surface and the transition densities. Using phenomenological parametrizations of the densities the analyses of elastic scattering yield rms radii of 〈r 2〉1/2=5.55±0.06 (204Pb), 5.57±0.06 (206Pb), 5.63±0.05 (208Pb) fm. Various sensitivities affecting the results were studied. From the inelastic cross sections for the 3 1 − -states octupole transition probabilities and transition radii were derived by using different methods proposed in literature.

Journal ArticleDOI
TL;DR: In this article, it was shown that the effect of the Pauli principle on the propagation of a deuteron in nuclear matter depends strongly on the relative orientation of the momentum and spin of the deuterons.

Journal ArticleDOI
TL;DR: In this article, a self-consistent many-particle model containing a two-body interaction with a quadratic momentum dependence is developed in the Hartree approximation, and various possible algebraic forms of the momentum dependence are studied in parallel.

Journal ArticleDOI
TL;DR: In this paper, the formation of high-density nuclear matter which may be expected to be attained in high-energy heavy-ion collisions and the subsequent disintegration of dense matter are investi- gated by means of the hydrodynamics.
Abstract: The formation of high-density nuclear matter which may be expected to be attained in high-energy heavy-ion collisions and the subsequent disintegration of dense matter are investi­ gated by means of the hydrodynamics. Head-on collisions of identical nuclei are considered in the nonrelativistic approximation. The compressed density cannot exceed 4 times of the normal one so long as the freedom of only nucleons is considered, and can become higher than 4 times when other freedoms such as the productions of mesons and also nucleon isobars are additionally taken into account. The angular distributions for ejected particles predominate both forwards and backwards at low collision energies, corresponding to the formation of nuclear density less than 2 times of the normal density and become isotropic at the point of 2 times of the normal one. As the collision energy increases further, lateral ejection is intensified gradually.

Journal ArticleDOI
TL;DR: In this article, the energy as a function of density is calculated for neutron matter and for symmetrical nuclear matter, based on Jastrow trial wave functions, and the energy expectation value is truncated in low cluster order.