[en] The contributions from different fields of mesons and photons to pseudospin symmetry are examined in the framework of relativistic mean field. The σ and ω fields are revealed to be dominant in influencing the pseudospin symmetry. The pseudospin splitting is shown to come from the competition of the σ and ω fields. The energy splitting between the pseudospin partner is found to increase with increasing σ-field strength, and to decrease with increasing ω-field strength. In comparison with the σ and ω fields, it is seen that the ρ meson and photon fields produce a minor influence on the pseudospin symmetry. (orig.)

[en] Based on the analysis of the advantages and disadvantages of the existing reactor types in the world and the application on ships, this paper suggests that the mature PWR can be used in the floating nuclear power plants on the sea, and the principle suggestions on the reactor power and refueling cycle are given. Taking the ship type floating nuclear power plant of single point mooring type as an example, the principle of compartment division is expounded, and the division is carried out according to the main functions of each cabin. The main restriction factors of the main scale are analyzed, and the general layout principle is expounded. The basic design principles of containment, safety enclosure, radioactive waste management system and biological shielding in the reactor compartment are emphatically introduced. At the same time, the design principles of some key systems such as secondary circuit, control room, power system and physical protection are introduced. (authors)

[en] Influences from different fields of mesons on the pseudospin symmetry are investigated for deformed nuclei. The energy splitting between pseudospin partners are extracted from the relativistic mean field calculations. The results show that the σ-field contribution to the pseudospin energy splitting has nearly the same magnitude as the one obtained by the ω-field, but with opposite signs. The pseudospin energy splittings either for neutron or for protons are almost the same if the σ-field (V_σ) and the ω-field (V_ω) change at the same scale. The pseudospin energy splitting depends in the same way as the nucleus binding energy of the cancellation of these two potentials, and is controlled by the same nuclear physics scale as the potential sum V_ω + V_σ In comparison with the σ- and ω-fields, it is seen that the ρ meson field produces a minor influence on the pseudospin symmetry. (orig.)

[en] We have developed a computational method to solve the complex scaled Schrödinger equation by basis expansion with a set of Laguerre polynomials, which results in the Hamiltonian of a hydrogen-like atom under the exponential cosine screened Coulomb (ECSC) potential imposed by an external electric field becoming a tridiagonal form. We have checked the convergence of computations with respect to the size of basis and stability against the complex scaling parameter in satisfactory results. Furthermore, we have explored the Stark resonances for a hydrogen-like atom under the ECSC potential, the available energies and widths are in agreement with those in the other methods. (paper)

[en] We applied the complex scaling method to study the resonances of a Dirac particle in the Yukawa potential, and obtained the corresponding energies and widths. In the non-relativistic limit, our results are in excellent agreement with those by non-relativistic calculations with J-matrix approach. Furthermore, we found that the energies and widths of spin doublets are approximately degenerate, and preserve a good spin symmetry. The quality of spin symmetry is correlated with the parameters of the Yukawa potential. (author)

[en] The extremely neutron-rich nucleus ¹⁹C has attracted much attention for its exotic properties. The most interesting is that the ground state of ¹⁹C behaves like a one-neutron halo. In order to understand this peculiar characteristic, we apply the complex momentum representation method to explore the weakly bound structure of ¹⁹C. We have calculated the single-particle energies for the bound and resonant states together with their evolutions to deformation, and checked the occupation probabilities of major configurations in the level occupied by the valance neutron. The result suggests that ¹⁹C is a prolate halo formed by a dominant s-wave configuration. (paper)

[en] High energy colliders provide a new unique way to determine the microscopic properties of dark matter (DM). Weakly interacting massive particles (WIMPs) are widely considered as one of the best DM candidates. It is usually assumed that the WIMP couples to the SM sector through its interactions with quarks and leptons. In this paper, we investigate the DM pair production associated with a Z boson in an effective field theory framework at the international linear collider, which can be used to study the interactions between the DM and leptons. For illustrative purposes, we present the integrated and differential cross sections for the e⁺e^- → χ anti χ Z process, where the Z boson is radiated from the initial state electron or positron. Meanwhile, we analyze the neutrino pair production in association with a Z boson as the SM background. (orig.)

[en] The study of exotic nuclei is one of the most interesting topics in nuclear physics. ³⁴Na has attracted additional attentions for an odd–odd nucleus with special structure. Here, we combine the complex momentum representation (CMR) and Green’s function (GF) to establish the CMR-GF method for the exploration of exotic structure, such as halo, skin, the level inversion and so on, in ³⁴Na. The available density distributions, the configuration occupations, and the root mean square radius for the orbit occupied by the last valence neutron suggest a p-wave single-neutron halo or skin structure in ³⁴Na. (paper)

[en] The Inert Doublet Model (IDM) is one of the many beyond Standard Model scenarios with an extended scalar sector, which provide a suitable dark matter particle candidate. Dark matter associated visible particle production at high energy colliders provides a unique way to determine the microscopic properties of the dark matter particle. In this paper, we investigate that the mono-W + missing transverse energy production at the Large Hadron Collider (LHC), where W boson decay to a lepton and a neutrino. We perform the analysis for the signal of mono-W production in the IDM and the Standard Model (SM) backgrounds, and the optimized criteria employing suitable cuts are chosen in kinematic variables to maximize signal significance. We also investigate the discovery potential in several benchmark scenarios at the 14 TeV LHC. When the light Z₂ odd scalar higgs of mass is about 65 GeV, charged Higgs is in the mass range from 120 GeV to 250 GeV, it provides the best possibility with a signal significance of about 3σ at an integrated luminosity of about 3000 fb⁻¹. (paper)

[en] Bound and resonant states of the Hulthén potential are studied. The complex scaling method is used to achieve the energy spectrum. The oscillator basis is used to expand the radial wave function. Conforming to the standard feature of the complex scaling method, the bound energies do not change and the continuums change with the rotational angle. With tables and graphs, the interesting properties of the energy spectrum for various physical parameters are presented. The Gauss quadrature integral approximation is used to deal with the potential integral term. (general)