[en] The squares of the neutron asymptotic normalization coefficient (ANC) for the virtual decay ¹²B →¹¹B + n are extracted to be 1.20 ± 0.26, 0.354 ± 0.107 and 1.98 ± 0.35 fm^-1 from the angular distributions of the ¹¹B(d, p)¹²B reaction leading to the ground, first and second excited states of ¹²B respectively, using the Johnson-Soper approach. According to charge symmetry of strong interaction, the square of proton ANC of virtual decay ¹²N →¹¹C + p is determined to be 1.63 ± 0.35 fm^-1 and then utilized to calculate the astrophysical S-factor and the rate of the direct capture contribution in the ¹¹C(p, γ)¹²N reaction. The astrophysical S-factor at zero energy for the direct capture, S(0), is derived to be 0.088 ± 0.019 keV b. An evaluated S(0) of 0.092 ± 0.009 keV b is then given by using the present and pre-existing experimental results. In addition, the proton widths of the first and second excited states of ¹²N are derived to be 0.91 ± 0.29 and 99 ± 20 keV from the neutron ANCs of ¹²B and used to compute the contribution from the first two resonances of ¹²N, respectively. We have also calculated the contribution from the interference effect between the direct capture and the second resonance

[en] We provide convenient parametrizations of the high-density nuclear equation of state obtained within the Brueckner-Hartree-Fock approach using different modern nucleon-nucleon potentials together with compatible microscopic nuclear three-body forces. The corresponding neutron star mass-radius relations are also presented

[en] The charged particles emitted during laser ablation off a brass target are detected using a metal probe in air. A special phenomenon is found in the recorded signals: following a giant electromagnetic peak observed immediately after the emission of the pulsed laser, a minor peak occurs whose polarity merely depends on the distance between the probe and the laser focal spot on the target. Under the condition of our experiment, the overturn point is 1.47 mm, i.e., the minor peak remains negative when the probe distance is less than 1.47 mm; it becomes positive while the probe is set at a distance beyond 1.47 mm. A hypothesis is proposed to explain the overturn that takes the flight behavior of the charged particles both in plasma and propagating shock wave into consideration

[en] The pressure fluctuations in a centrifugal compressor with different inlet guide vanes (IGV) pre-whirl angles were investigated numerically, as well as the pre-stress model and static structural of blade. The natural frequency was evaluated by pre-stress model analysis. The results show that, the aero-dynamic pressure acting on blade surface is smaller than rotation pre-stress, which wouldn't result in large deformation of blade. The natural frequencies with rotation pre-stress are slightly higher than without rotation pre-stress. The leading mechanism of pressure fluctuations for normal conditions is the rotor-stator (IGVs) interaction, while is serious flow separations for conditions that are close to surge line. A few frequency components in spectra are close to natural frequency, which possibly result in resonant vibration if amplitude is large enough, which is dangerous for compressor working, and should be avoided

[en] We construct microscopic three-nucleon forces consistent with the Bonn and Nijmegen two-nucleon potentials, and including Δ, Roper, and nucleon-antinucleon excitations. Recent results for the choice of the meson parameters are discussed. The forces are used in Brueckner calculations and the saturation properties of nuclear matter are determined

[en] The ¹³N+p elastic resonance scattering has been studied in inverse kinematics via a thick-target method. A ¹³N secondary beam of 47.8±1.5 MeV produced by the ²H(¹²C,¹³N)n reaction was used to bombard a 9.33 mg/cm² (CH₂)_n target. The recoil protons were detected by a ΔE-E silicon counter telescope at θ_lab=15 deg. The performance of the setup was checked by ¹²C+p elastic resonance scattering with the same (CH₂)_n target. The excitation function for the ¹³N(p,p) elastic scattering was obtained in the energy interval of E_c.m.∼0.5-3.2 MeV and was analyzed by using a multilevel R-matrix code MULTI7. Several low-lying excited states in ¹⁴O were surveyed. Our results confirm a very recent 2^- assignment to the 6.8 MeV level and agree with the observation of a new 0^- level at 5.7 MeV with a width of 400(45) keV

[en] The volume part of the phenomenological optical potential is interpreted in terms of the microscopic theory of nuclear matter. The latter is based on the Brueckner-Hartree-Fock approach with a new version of three-body force, reproducing the empirical saturation properties of nuclear matter. The self-energy is calculated and its on-shell matrix elements are related to the volume part of the optical potential. A comparison is made with a recent parametrization of the optical model potential fitting the experimental nucleon-nucleus elastic scattering. The isospin effects and Coulomb corrections are emphasized

[en] A method, neutron transfer reaction and charge symmetry of mirror nuclei, is used to study (p,γ) reaction on proton-rich nuclei in this paper. The asymptotic normalization coefficients (ANCs) of virtual decays 9Li → 8Li + n and 27Mg → 26Mg + n were extracted from the angular distributions of the 8Li(d, p)9Li and 26Mg(d, p)27Mg reactions, through distorted wave Born approximation (DWBA) analysis. The astrophysical S-factors and reaction rates of 8B(p, γ)9C and 26Si(p, γ)27P were then determined based on charge symmetry

[en] To achieve high power microwave combined with high frequency band, an X-band phase-locked relativistic backward wave oscillator (RBWO) is proposed and investigated theoretically and experimentally using a modulated electron beam. In the device, an overmoded input cavity and a buncher cavity are employed to premodulate the electron beam. Particle-in-cell simulation shows that an input power of 90 kW is sufficient to lock the frequency and phase of 1.5 GW output microwave with the locking bandwidth of 60 MHz. Moreover, phase and frequency locking of an RBWO has been accomplished experimentally with an output power of 1.5 GW. The fluctuation of the relative phase difference between output microwave and input RF signal is less than ±20° with the locking duration of about 50 ns. The input RF power required to lock the oscillator is only 90 kW

[en] For the purpose of coherent high power microwave combining at high frequency band, an X-band phase-locked relativistic backward wave oscillator is presented and investigated. The phase-locking of the oscillator is accomplished by modulation of the electron beam before it reaches the oscillator. To produce a bunched beam with an acceptable injected RF power requirement, an overmoded input cavity is employed to provide initial density modulation. And a buncher cavity is introduced to further increase the modulation depth. When the beam enters the oscillator, the modulation depth is enough to lock the frequency and phase of the output microwave generated by the oscillator. Particle-in-cell simulation shows that an input power of 90 kW is sufficient to lock the frequency and phase of 1.5 GW output microwave with locking bandwidth of 60 MHz