Showing papers on "Mass formula published in 1986"
TL;DR: In this paper, the occurrence of highly deformed nuclei in the A approximately=80 and A approximately =100 mass regions has been investigated in the framework of the Strutinsky approach with a Nilsson-type potential and the Yukawa-plus-exponential macroscopic mass formula, including elongation, necking and gamma deformation.
Abstract: The occurrence of highly deformed nuclei in the A approximately=80 and A approximately=100 mass regions has been investigated in the framework of the Strutinsky approach with a Nilsson-type potential and the Yukawa-plus-exponential macroscopic mass formula, including elongation, necking and gamma deformation. Special emphasis was given to the spin-orbit potential parameters, which have large variations at the magic numbers and also depend on the shell filling. Good reproduction of the masses, deformations and shape transition was achieved in both mass regions. The phenomena of shape coexistence are also supported by the calculated potential energy surfaces. The odd-particle influence in driving the nucleus to deformed shapes is demonstrated. The results obtained are rather similar to those of the more elaborated Yukawa shell-model calculations, and show for the first time that a Nilsson-type model can also account for the large deformations of the light Kr, Sr and Zr nuclei.
45 citations
TL;DR: In this paper, a complete set of symmetry-related hadronic loops were considered for the analysis of baryon spectroscopy and it was shown that these effects very likely constitute the dominant contribution to the observed splitting and mixing pattern of the (56, 0+) and (70, 1−)-multiplet.
43 citations
TL;DR: In this paper, the authors make a preliminary study of the possibilities offered by the Skyrme-ETF method and compare it with the Expectation-value (EF) method.
41 citations
TL;DR: In this paper, the authors measured the topological charge density of the Monte Carlo generated SU(3) vacuum and found that the susceptibility to lattice artifacts varies with g 2 like the string tension (within errors).
32 citations
TL;DR: Nuclear spallation reactions are treated as two step processes involving energy deposition and subsequent evaporation, calculated in Glauber's multiple scattering formalism with modification for direct knockout processes.
Abstract: Nuclear spallation reactions are treated as two step processes involving energy deposition and subsequent evaporation. The first step is calculated in Glauber's multiple scattering formalism with modification for direct knockout processes. Evaporation is treated by following the mean yield of particles from the residual nucleus taken as an excited Fermi gas with ground state provided by the semiempirical mass formula. The spallation mass yield is derived to be an exponential in the mass of the fragments. The amplitude of the exponential and its slope depend on the projectile energy and target mass. Experimental data are well reproduced without free parameters.
24 citations
TL;DR: A relativistic supersymmetric quantum mechanics is proposed which uses Osp(1,4)containsSO(3,2) for the spectrum and constrained Hamiltonian quantum mechanics for the dynamics of one-hadron systems.
Abstract: A relativistic supersymmetric quantum mechanics is proposed which uses Osp(1,4)containsSO(3,2) for the spectrum and constrained Hamiltonian quantum mechanics for the dynamics of one-hadron systems. It combines baryon and meson towers into infinite supermultiplets in a way similar to the use of supersymmetries in nuclear physics. The predicted mass formula is fitted to the masses of baryon and meson resonances.
12 citations
TL;DR: In this paper, the effect of vacuum polarization on the ground-state mass systematics of nuclei is considered and its contribution to the ground state energy of heavy nuclei was found to be a few MeV and can be simulated using an effective nuclear radius in the Coulomb energy term of the mass formula.
3 citations
TL;DR: In this paper, the squared mass of the hadron is defined as a random variable, whose average is the measured quantity, and a mass formula, of a unique type for mesons and baryons, with a general law for the spin variation of the coefficients.
Abstract: In this paper the squared mass of the hadron is defined as a random variable, whose average is the measured quantity. This leads to a mass formula, of a unique type for mesons and baryons, with a general law for the spin variation of the coefficients. The central squared masses form an overall geometrical scheme; in the baryon case it contains trajectories which are a fine structure of the Regge trajectories. For the accurately measured masses the difference between the computed and experimental value lies within 5 MeV for mesons and baryons. The geometrical scheme will be the basis for the computation of the decay rates, to be developed in the next paper.
2 citations
TL;DR: In this article, a mechanism of generating hierarchical fermion masses is proposed for the SO(10) ⊗ U(1)PQ ⊂ GH model with an intermediate mass scale of the symmetry breakdown, where GH is assumed to be a global horizontal symmetry.
2 citations
01 Jan 1986
TL;DR: In this paper, the elastic collision of two heavy-ions is depicted schematically in Fig. 1 and Fig. 2, where the authors show that the situation is similar to ours.
Abstract: In the elastic collision of two heavy-ions, we expect a situation depicted schematically in Fig. 1.
1 citations
TL;DR: In this article, the relations between different definitions of the surface tension σ of a two-component saturating system are considered and the non-trivial link between the values of σ and the surface energy appearing in the mass formula is studied.
TL;DR: In this paper, a finite one-loop corrections to the mass formula Str M2 = 0 was derived for the broken non-symmetric phase of the O'Raifeartaigh model with the help of supergraph methods extended to the case of broken global supersymmetries.
TL;DR: In this paper, a macroscopic nuclear model with a simple energy functional to determine the nuclear densities and the nuclear mass formula is proposed, and the parameters contained in the functional are determined by fitting the atomic masses and the other nuclear average properties.
Abstract: A macroscopic nuclear model is proposed with a simple energy functional to determine the nuclear densities and the nuclear mass formula. The parameters contained in the functional are determined by fitting the atomic masses and the other nuclear average properties. Shell corrections os Moller and Nix are adopted. The rms deviation of fitting of atiomic masses is 0.805 MeV.
01 Jan 1986
TL;DR: In this paper, a new quantum relativistic oscillator (QRO) based on the spectrum generating group SO(3,2) was constructed and all the features of the three-dimensional harmonic oscillator were recovered in the non-relativistic limit.
Abstract: We construct a new quantum relativistic oscillator (QRO) based on the spectrum generating group SO(3,2). We show that all the features of the three-dimensional harmonic oscillator are recovered in the non-relativistic limit. This QRO gives a classification of hadrons that leads to the linear Regge trajectories; moreover, the Regge slopes are SU(3) invariant.