[en] The current density J(ρ, z) in a disc-shaped superconducting bulk magnet and the magnetic levitation force F^SBM_z exerted on the superconducting bulk magnet by a cylindrical permanent magnet are calculated from first principles. The effect of the superconducting parameters of the superconducting bulk is taken into account by assuming the voltage-current law E = E_c(J/J_c)ⁿ and the material law B = μ₀H. The magnetic levitation force F^SBM_z is dominated by the remnant current density J'₂(ρ, z), which is induced by switching off the applied magnetizing field. High critical current density and flux creep exponent may increase the magnetic levitation force F^SBM_z. Large volume and high aspect ratio of the superconducting bulk can further enhance the magnetic levitation force F^SBM_z

[en] High spin states in ¹³⁹Nd nucleus have been reinvestigated with the reaction ¹²⁸Te (¹⁶O, 5n) at a beam energy of 90 MeV. The level scheme has been expanded with spin up to 47/2(ℎ/2π). At low spin, the yrast collective structure built on the νh_11/2^-1 multiplet shows a triaxial shape with γ≅32 deg. according to calculations of the triaxial rotor-plus-particle model. The configurations for some high spin states have been discussed from a systematic comparison with neighboring nuclei. Three collective oblate bands with γ∼-60 deg. at high spin were identified for the first time. A band crossing is observed around (ℎ/2π)ω∼0.4 MeV in one oblate band based on the 25/2^- level. The characteristics for these oblate bands have been discussed

[en] The magnetic and chiral rotation, the critical symmetry are fundamental problems in the study of nuclear structure. Here we report the recent results from the experiments on the magnetic and electric rotations in ¹⁰⁶Ag, the chiral rotation in ¹³⁰Cs and the evolution of X(5) symmetry in ¹⁷⁶Os.

[en] High-spin states in the odd-odd ¹³⁸Pr nucleus were reinvestigated with the reaction ¹²⁸Te(¹⁴N,4n) at a beam energy of 64 MeV. Six collective bands were observed, and two of them were newly identified. For the πh_11/2xνh_11/2 band, high-spin states are followed up to I^π=16⁺. The spin values for this band have been reassigned based on the systematical comparison with the neighboring nuclei. The observed band crossing is proposed to be due to the alignment of protons, and the signature inversion with the neutron number changing in La and Pr isotopes has been discussed. The other five collective bands are proposed to be based on oblate deformation with γ∼-60 deg

[en] We predict a new two-dimensional allotrope of phosphorus, which we call red phosphorene, by restructuring the segments of the previously proposed blue and black phosphorenes. Its atomic and electronic structures as well as the thermodynamic and dynamic stabilities are systematically studied by first-principles calculations. The results indicate that the red phosphorene is dynamically stable and possesses remarkably thermodynamical stability comparable to that of the black one. Because of the sp"3-hybridization and the formation of a localized lone pair, red phosphorene is a semiconductor with an indirect band gap of about 1.96 eV, which can be effectively modulated by in-plane strains due to its wave-like configuration. We find that the red, black and blue phosphorenes show evident distinction in their layer thicknesses, surface work functions, and possible colors, based on which one can distinguish them in future experiments. (paper)

[en] The high spin states of ¹⁰⁶Ag were populated via the fusion-evaporation reaction ¹⁰⁰Mo(¹¹B,5n)¹⁰⁶Ag at a beam energy of 60 MeV. A new level scheme of ¹⁰⁶Ag is built on basis of the present experiment. The positive parity band with the configuration of πg_9/2 x V[h_11/2²(g_7/2/d_5/2)] is discussed on the ground of shears mechanism. Theoretical calculation of the effective interaction performed by TAC model agrees well with the experimental value. Systematics study shows that Ag isotopes are probably at the boundary of magnetic rotation in A∼110 mass region.

[en] The high-spin states of ¹⁴¹Pm have been investigated through the reaction ¹²⁶Te(¹⁹F,4n) at a beam energy of 90 MeV. A previous level scheme has been updated with spins up to 49/2(ℎ/2π). Six collective bands at high spins are newly observed. Based on the systematic comparison, one band is proposed as a decoupled band; two bands with strong ΔI=1 M1 transitions inside the bands are suggested as the oblate bands with γ ∼-60 deg.; three other bands with large signature splitting have been proposed with the oblate-triaxial deformation with γ∼ -90 deg. The triaxial n-particle-n-hole particle rotor model calculations for one of the oblate bands in ¹⁴¹Pm are in good agreement with the experimental data. The other characteristics for these bands have been discussed.

[en] High-spin states of ¹⁰⁶Ag were populated via the fusion-evaporation reaction ¹⁰⁰Mo (¹¹B,5n)¹⁰⁶Ag at a beam energy of 60 MeV. A rich level scheme with six band structures has been established. A high-K negative-parity band has been identified and assigned to the πg_9/2 x ν[h_11/2(g_7/2/d_5/2)²] configuration. The positive parity ΔI=1 band, built on the 12⁺ state, is discussed in terms of the magnetic rotation model. The systematic study of similar bands in the A∼110 mass region indicates that the magnetic rotation phenomenon has, as lower boundary, the Ag isotopes at Z=47.

[en] Observationally, the interstellar gas-phase abundance of deuterium (D) is considerably depleted and the missing D atoms are often postulated to have been locked up into carbonaceous solids and polycyclic aromatic hydrocarbon (PAH) molecules. An accurate knowledge of the fractional amount of D (relative to H) tied up in carbon dust and PAHs has important cosmological implications since D originated exclusively from the Big Bang and the present-day D abundance, after accounting for the astration it has experienced during Galactic evolution, provides essential clues to the primordial nucleosynthesis and the cosmological parameters. To quantitatively explore the extent to which PAHs could possibly accommodate the observed D depletion, we have previously quantum-chemically computed the infrared vibrational spectra of monodeuterated PAHs and derived the mean intrinsic band strengths of the 3.3 μm C–H stretch (A _3.3) and the 4.4 μm C–D stretch (A _4.4). Here we extend our previous work to multideuterated PAH species of different deuterations, sizes, and structures. We find that both the intrinsic band strengths A _3.3 and A _4.4 (on a per-unit-bond basis) and their ratios A _4.4/A _3.3 not only show little variation among PAHs of different deuterations, sizes, and structures, they are also closely similar to that of monodeuterated PAHs. Therefore, a PAH deuteration level (i.e., the fraction of peripheral atoms attached to C atoms in the form of D) of ∼2.4% previously estimated from the observed 4.4 to 3.3 μm band ratio based on the A _4.4/A _3.3 ratio of monodeuterated PAHs is robust.

[en] The high spin states of ¹¹²In has been investigated with γ-ray spectroscopic methods using the ¹¹⁰Pd(⁷Li, 5n)¹¹²In reaction at 50MeV ⁷Li beam energy. A level scheme with 10 new band structures has been established. The positive yrast magnetic dipole band is suggested as πg_9/2xυh_11/2²(g_7/2/d_5/2) configuration and its properties are discussed in the framework of the shears coupling model.