[en] The energies of the (0S)⁶ six quark cluster states are calculated in the chiral SU(3) quark model. The results show that some states with high strangeness have more attraction from the chiral SU(3) coupling, and this feature is interesting in discussing if there exists some new narrow width six quark states. Further, we did a RGM calculation to study some multi-strangeness dibaryon states. We found that ΩΩ dibaryon is a deeply bound state and ΞΩ dibaryon is slightly bound

[en] The energies of the (0S)⁶ six quark cluster states are calculated in the chiral SU(3) quark model. The results show that some states with high strangeness have more attraction from the chiral SU(3) coupling, and this feature is interesting in discussing if there exists some new narrow width six quark states. Further, we did a RGM calculation to study some multi-strangeness dibaryon states. We found that ΩΩ dibaryon is a deeply bound state and ΞΩ dibaryon is slightly bound.

[en] Using 3D test particle simulations, the characteristics and essential conditions under which an electron, in a vacuum laser beam, can undergo a capture and acceleration scenario (CAS). When a₀ ∼> 100 the electron can be captured and violently accelerated to energies ∼> 1 GeV, with an acceleration gradient ∼> 10 GeV/cm, where a₀ = eE₀/m_eωc is the normalized laser field amplitude. The physical mechanism behind the CAS is that diffraction of the focused laser beam leads to a slowing down of the effective wave phase velocity along the captured electron trajectory, such that the electron can be trapped in the acceleration phase of the wave for a longer time and thus gain significant energy from the field

[en] This paper studies the output properties of GeV electron bunches driven by ultra-intense lasers in vacuum based on the mechanism of capture and violent acceleration scenario [CAS, see e.g. J.X. Wang, et al., Phys. Rev. E 58 (1998) 6575]. We find that the output of the acceleration mechanism is a GeV electron macro-pulse which consists of many micro-pulses corresponding to the periodicity of the laser wave. The outgoing electrons can generally be divided into two groups. One spreads greatly in space and the other is a high-energy bunch with limited spread in space. Provided that the incoming electron bunch with comparable sizes as that of the laser pulse synchronously impinges on the laser pulse, the total fraction of CAS electrons can reach more than 20% of the incident electrons. These results demonstrate that the CAS is a pretty effective accelerator mechanism

No abstract available

[en] It has been found that for a focused laser beam propagating in free space, there exists, surrounding the laser beam axis, a subluminous wave phase velocity region. Relativistic electrons injected into this region can be trapped in the acceleration phase and remain in phase with the laser field for sufficiently long times, thereby receiving considerable energy from the field. Optics placed near the laser focus are not necessary, thus allowing high intensities and large energy gains. Important features of this process are examined via test particle simulations. The resulting energy gains are in agreement with theoretical estimates based on acceleration by the axial laser field

[en] The H-dihyperon (DH) is studied in the framework of the SU(3) chiral quark model. It is shown that, with the exception of the σ chiral field, the overall effect of the other SU(3) chiral fields is destructive in forming a stable DH. The resultant mass of DH in a three-coupled channel calculation ranges from 2225-2234 MeV. (author)

[en] In this paper, we present experimental studies of both high-k _r ( cm⁻¹, and , respectively; ) and high- ( cm⁻¹, and , respectively; ) turbulence behavior during an ohmic energy confinement degradation phase in experimental advanced superconducting tokamak (EAST). High-k _r turbulence from density fluctuation at and high- turbulence from density fluctuation at –0.97 were measured by tangential and poloidal CO₂ laser collective scattering diagnostics, respectively. Note that k _r, , and are radial wavenumber, poloidal wavenumber, perpendicular wavenumber and ion gyroradius at electron temperature, respectively. Both high-k _r/ turbulence power and energy confinement time are found to be temporally correlated to line-averaged electron density n _e in the plasma current flat-top phase (I _p  =  0.4 MA): when the n _e shows continuous increase/decrease, the high-k _r/ turbulence power increases/decreases correspondingly and the shows corresponding decrease/increase; the stable n _e is related to stable both and high-k _r/ turbulence power. Statistical results of high-k _r/ turbulence power versus further imply that high-k _r/ turbulence shows a strong correlation with plasma energy confinement degradation in high line-averaged n _e condition, but high-k _r and high- turbulence have relatively weak and no dependence on the transition between linear range in low-n _e condition and energy confinement degradation in the high-n _e condition, respectively. Moreover, profiles of electron temperature T _e and n _e as well as their normalized gradients in a part of high- density fluctuation measurement region also have been given to qualitatively explain the enhancement of turbulence power with the increase of line-averaged n _e. (paper)