125624266
beta-delayed proton decays near the proton drip line
We briefly reviewed and summarized the experimental study on {beta}-delayed proton decays published by our group over the last 8 years, namely the experimental observation of {beta}-delayed proton decays of nine new nuclides in the rare-earth region near the proton drip line and five nuclides in the mass 90 region with N{approx}Z by utilizing the p-{gamma} coincidence technique in combination with a He-jet tape transport system. In addition, important technical details of the experiments were provided. The experimental results were compared to the theoretical predictions of some nuclear models, resulting in the following conclusions. (1) The experimental half-lives for {sup 85}Mo, {sup 92}Rh, as well as the predicted 'waiting point' nuclei {sup 89}Ru and {sup 93}Pd were 5-10 times longer than the macroscopic-microscopic model predictions of Moeller et al. [At. Data Nucl. Data Tables 66,131(1997)]. These data considerably influenced the predictions of the mass abundances of the nuclides produced in the rp process. (2) The experimental assignments of spin and parity for the drip-line nuclei {sup 142}Ho and {sup 128}Pm could not be well predicted by any of the nuclear models. Nevertheless, the configuration-constrained nuclear potential-energy surfaces calculated by means of a Woods-Saxon-Strutinsky method could reproduce the assignments. (3) Themore » ALICE code overestimated by one or two orders of magnitude the production-reaction cross sections of the nine studied rare-earth nuclei, while the HIVAP code overestimated them by approximately one order of magnitude.« less
119784397
beta-delayed proton decay of the proton drip-line nucleus Ho-142
Unknown beta -delayed proton precursor Ho-142 was synthesized in the reaction Cd-106 (Ca-40.p3n) and identified for the first time using proton-gamma coincidence measurements in combination with a helium-jet fast tape-transport system. Its beta -delayed proton spectrum was observed. The half-life of Ho-142 was determined to be 0.4+/-0.1 s. According to the estimated relative branching ratios to the final states in the daughter nucleus, the ground-state spin of Ho-142 could be assigned as 6, 7, or 8.
99999919
Spin assignments for the beta-delayed proton precursors Ho-142 and Pm-128
The previous experimental data on beta-delayed proton decays of Ho-142 and Pm-128 were compared with a statistical-model calculation. As a result, the spins of both Ho-142 and Pm-128 were assigned as 5, 6, or 7. Nuclear potential-energy surface calculations were performed using the Woods-Saxon-Strutinsky method. The calculated results support the assignments of 7(-) to Ho-142 and 6(+) to Pm-128.
120471376
QGP phase transition and multiplicity fluctuations
The scaled factorial moments in QGP phase transitions are studied analytically by the extended Ginzburg-Landau model. The dependence of lnFq on phase space interval is different for the first- and second-order QGP phase transitions. When lnFq, are fitted to polynomials ofX≡δ1/3, the relative sign between the fitted coefficients ofX andbq,1 calculated theoretically can be used to judge the order of phase transitions. Two sets of experimental data are reanalysed and the phase transitions are the first order for one set of data but the second order for another.
22190150
Globally polarized quark-gluon plasma in noncentral A + A collisions.
Produced partons have a large local relative orbital angular momentum along the direction opposite to the reaction plane in the early stage of noncentral heavy-ion collisions. Parton scattering is shown to polarize quarks along the same direction due to spin-orbital coupling. Such global quark polarization will lead to many observable consequences, such as left-right asymmetry of hadron spectra and global transverse polarization of thermal photons, dileptons, and hadrons. Hadrons from the decay of polarized resonances will have an azimuthal asymmetry similar to the elliptic flow. Global hyperon polarization is studied within different hadronization scenarios and can be easily tested.
118833690
Experimental spectra analysis in THM with the help of simulation based on the Geant4 framework
The Coulomb barrier and electron screening cause difficulties in directly measuring nuclear reaction cross sections of charged particles at astrophysical energies. The Trojan-horse method (THM) has been introduced to solve the difficulties as a powerful indirect tool. In order to understand experimental spectra better, Geant4 is employed to simulate the method. Validity and reliability of simulation data are examined by comparing the experimental data with simulated results. The Geant4 simulation of THM improves data analysis and is beneficial to the design for future related experiments.
119291775
Nuclear Shell Structure Evolution Theory
The Self-similar-structure shell model (SSM) comes from the evolution of the conventional shell model (SM) and keeps the energy level of SM single particle harmonic oscillation motion. In SM, single particle motion is the positive harmonic oscillation and in SSM, the single particle motion is the negative harmonic oscillation. In this paper a nuclear evolution equation (NEE) is proposed. NEE describes the nuclear evolution process from gas state to liquid state and reveals the relations among SM, SSM and liquid drop model (DM). Based upon SSM and NEE theory, we propose the solution to long-standing problem of nuclear shell model single particle spin-orbit interaction energy . We demonstrate that the single particle motion in normal nuclear ground state is the negative harmonic oscillation of SSM[1][2][3][4] 
Key words: negative harmonic oscillation, nuclear evolution equation, self-similar shell model
120366134
Discovery of Jet Quenching and Beyond
Recent observation of high-pT hadron spectra suppression and mono-jet production in central Au+Au collisions and their absence in d+Au collisions at RHIC have confirmed the long predicted phenomenon of jet quenching in high-energy heavy-ion collisions. Detailed analyses of the experimental data also show parton energy loss as the mechanism for the discovered jet quenching. Using a pQCD parton model that incorporates medium modified parton fragmentation functions and comparing to experimental data from deeply inelastic scattering off nuclei, one can conclude that the initial gluon (energy) density of the hot matter produced in central Au+Au collisions that causes jet quenching at RHIC is about 30 (100) times higher than in a cold Au nucleus. Combined with data on bulk and collective properties of the hot matter, the observed jet quenching provides strong evidence for the formation of a strongly interacting quark–gluon plasma in central Au+Au collisions at RHIC.