[en] We show by using the mean-field approximation that the states of composite Fermi-Bose superfluids created in cold-atom traps via a Feshbach resonance at zero temperature are generalized SU(2)xSU(1,1) coherent states. In response to a sudden change of the interaction between fermionic atoms and bosonic molecules, a Cooper pair can exhibit collapse and revival quantum behaviors for an initial generalized coherent state of molecules, and Rabi oscillation for a vacuum molecular state. Occurrence of the collapse and revival phenomenon is thus the manifestation of the formation of the Bose-Einstein condensate

[en] The quasielastic scattering (QEL) excitation functions for ¹⁶O + ¹⁵²Sm, ¹⁷⁰Er and ¹⁷⁴Yb were measured with high precision at a backward angle with small energy intervals at energies near the Coulomb barriers. The hexadecapole deformation (β₄) of the target nuclei was extracted by using the lower-energy data and the obtained values agree reasonably well with the available results. The extracted β₄ values show a transition from positive for ¹⁵²Sm and near-zero for ¹⁷⁰Er, to negative for ¹⁷⁴Yb, which is consistent with the available trend. This means that the backward QEL at the lower-energy region, like fusion excitation function, is indeed sensitive to the higher-order deformation and especially the sign of β₄. This offers a sensitive method to extract β₄. This method is especially meaningful for the radioactive nuclei considering the low beam intensities. (authors)

[en] This contribution reports the recent experimental studies for the coupling effect of the positive Q-value neutron transfer (PQNT) channels on near-barrier fusion with heavy-ions, measured by an electrostatic deflector setup. This effect is expected to be important in some situations. In this presentation, the experimental studies for the near-barrier fusion of ³²S + ^90,94,96Zr, ¹⁶O + ⁷⁶Ge, ¹⁸O + ⁷⁴Ge, and ^16,18O + ⁵⁸Ni are reported. Also a method, based on the CCFULL calculations with suitable inelastic couplings, to sort out the PQNT effect is presented. (authors)

[en] Angular distributions of transfer reaction "2"0"8Pb("7Li,"6He)"2"0"9Bi were measured at Elab("7Li)= 21.2, 24.3, 25.67 and 28.55 MeV. By fitting the experimental data with the theoretical frameworks of Distorted Wave Born Approximation (DWBA), the optical model parameters of the halo nuclear system "6He+"2"0"9Bi were extracted. The breakup threshold anomaly (BTA) was observed clearly in the imaginary potential, and a further decreasing trend in the deep sub-barrier region was observed for the first time in a halo system. Furthermore, the dispersion relation is found of no use to describe the connection between the real and imaginary parts

[en] In previous work, we reported that a superheating YBCO thin film was used to act as a seed for YBCO bulk growth by the melt-texture (MT) process. In this paper, we display a further development of using the NdBCO thin films as a homo-seed in the growing of NdBCO bulks with well c-axis orientation. Since in this process the NdBCO film endured a temperature as high as 1090 deg. C (for 1.5 h), which is higher than the T_p of any REBCO compound, this success indicates that the NdBCO film could be a promising seed for epitaxially growing any RE-Ba-Cu-O bulks. According to the results of X-ray diffraction (XRD), we also found that the existence of extra phases in NdBCO film will lower the superheating property and consequently weaken its capability of being a seed

[en] A contrastive research on two-proton (2p) emissions from excited states of the even-Z nucleus ²⁸S and its one-proton daughter, the odd-Z nucleus ²⁷P was performed by complete-kinematics measurements. The opening angles as well as relative momenta between two emitted protons and invariant masses of decaying systems were reconstructed through the event-by-event analysis of heavy fragments coincident with two protons. With the help of Monte Carlo simulations, results show a diproton-type decay with the branching ratio of 20₋₇⁺⁶% for ²⁸S while mainly three-body simultaneous decay in the phase space and/or 2p sequential emission for ²⁷P. Present results show that the diproton correlations may result from the proton configuration in the initial state like 2p skin/halo structure rather than the deformed orbit

[en] Highlights: • The load-depth curves are steeper, and severer creep comes at higher loading rate. • Strain rate sensitivity determined from creep decreases with loading rate. • Both volume and energy barrier of shear transformation zone rise with loading rate. • Smaller structural heterogeneity density is found at higher loading rate. • Both the size and density of fertile sites affect deformation mode transition. -- Abstract: The effects of loading rate on creep behavior and shear transformation zone (STZ) in magnetron sputtered La-Co-Al and Zr-Cu-Ni-Al amorphous alloy thin films were characterized through instrumented nanoindentation with a spherical indenter. It was revealed that with an increase in loading rate, both thin films became harder with a narrower distribution of mechanical response, and exhibited more pronounced creep displacement with higher creep strain rate. Based on cooperative shear model, both STZ volume and activation energy were calculated by measuring the strain rate sensitivity during creep, showing an increasing tendency with loading rate. However, the strain rate sensitivity was found to decrease with loading rate. Furthermore, structural heterogeneity density, estimated by analyzing the stressed volume at yielding, decreased with loading rate. Therefore, with increasing loading rate, the STZ event can only be activated at detectable structural heterogeneities with relatively larger volume, and the number of available fertile sites was decreased, resulting in postponed shear band formation and suppressed deformation mode transition.

[en] Quasi-elastic scattering angular distribution for the 94.5 MeV ${}^{17}$F radioactive ion beam on the ${}^{208}$Pb target has been measured. To describe the experimental quasi-elastic scattering angular distribution and explore the reaction dynamic, firstly, the optical potentials with the double-folding São Paulo and Akyüz Winther potentials for both real and imaginary parts were used to analyze the experimental data. It is observed that both theoretical angular distributions are very similar. The optical model results describe reasonably the experimental data until 100${}^{\circ <!--\; ???\; -->}$ but underpredict the data for larger angles. Secondly, the continuum discretized coupled channel method (CDCC) was used to study the effect of the breakup channel on the elastic scattering. The double-folding São Paulo and Akyüz Winther potentials were used as nuclear interactions giving again similar results. The agreement with the data is slightly improved at intermediate angles. The sensibility of the CDCC effects upon the nuclear interaction potential was checked. Finally, the influence of inelastic states of both projectile and target, the one-proton, one-neutron, two-neutron and α transfer channels on the quasi-elastic scattering angular distribution is analyzed in the frame of the coupled channel and coupled reaction channel methods, respectively. It is observed that the coupling to the first excited state of ${}^{17}$F is the one that affects more the elastic scattering, although the inelastic channels of the target also influence it when compared with the optical model results. The effect of the transfer channels on the quasi-elastic angular distribution is negligible.

[en] The precise calibration of angular distribution of heavy-ion elastic scattering induced by Radioactive Ion Beams (RIBs) at energies around Coulomb barrier on the Radioactive Ion Beam Line in Lanzhou (RIBLL) at the Heavy-Ion Research Facility in Lanzhou (HIRFL) is presented. The beam profile and the scattering angles on the target are deduced by a measurement with two Multi Wire Proportional Chambers (MWPC), and four sets of detector telescopes (including Double-sided Silicon Strip Detectors (DSSD) placed systematically along the beam line, incorporating with Monte Carlo simulation. The MWPCs were used to determine the beam trajectory before the target, and the energies and the positions of scattered particles on the detectors were measured by the DSSDs. Minor corrections on the beam spot and the detector position are performed by assuming the pure Rutherford scattering at angles which are smaller than the related grazing angle. This method is applied for the elastic scattering of "1"7F on "8"9Y target at E_l_a_b=59 MeV and 50 MeV.

[en] The β-delayed two-proton emission from ²²Al was investigated experimentally through the implantation-decay method. A β-delayed two-proton decay branch from ²²Al were identified based on the coincidence of the charged particles and γ-ray signals. The relative momentum ($q_{pp}$) and the opening angle (${\theta }_{pp}$) distributions of the two β-delayed protons are measured and a strong peak at $q_{pp}\sim 20\text{MeV/c}$, as well as a peak at ${\theta }_{pp}\sim {30}^{\circ }$ are observed clearly. The β-delayed ²He emission from ²²Al with a probability of 29 (13)% by fitting the experimental data with the results of Monte Carlo simulations.