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1. Reanalysis of the astrophysical S(E) factor and screening potential for B-11(p, alpha(0))Be-8 reaction at sub-Coulomb energies | |||
LU Yongkai,ZHANG Qian,GUAN Xingcai,WANG Qiang,ZHAO Jiangtao,WANG Tieshan | |||
Physics 08 February 2018 | |||
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Abstract:A new astrophysical S-factor of B-11(p,alpha(0))Be-8 reaction at sub-Coulomb energies was extracted through reanalyzing the experimental data obtained with Trojan Horse Method (THM) reported by Spitaleri et al. and Lamia et al. Based on this S-factor, three sets of direct experimental data in sub-Coulomb energy region were refitted to obtain the screening energy (Us) provided by surrounding charges. The result showed that Us=360±130 eV, which was more consistent with the prediction value (340 eV) from adiabatic limit theory compared with the result (472±160 eV) reported by Lamia et al. | |||
TO cite this article:LU Yongkai,ZHANG Qian,GUAN Xingcai, et al. Reanalysis of the astrophysical S(E) factor and screening potential for B-11(p, alpha(0))Be-8 reaction at sub-Coulomb energies[OL].[ 8 February 2018] http://en.paper.edu.cn/en_releasepaper/content/4743545 |
2. Transformation from hadronic to quark matter in neutron stars: a comparison of two scenarios | |||
Shao Guo-yun | |||
Physics 27 May 2017 | |||
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Abstract:We investigate the hadron-quark transformation in dense neutron star matter with two different scenarios: the conventional first-order phase transition and a phenomenological smooth crossover transition. In the first-order transition scenario, the phase equilibrium is constructed based on Gibbs criteria. However, in the smooth crossover scheme, due to the overlap of nucleons and quark percolation at intermediate density, the thermodynamics of the strongly correlated system in the transition region includes the contributions from both hadronic and quark degrees of freedom. Both the first-order and crossover transition scenarios show that therepulsive vector interaction plays an crucial role in the phase transition, but their requirements on the couplingstrength are different to produce a massive hybrid neutron star comparable with the precisely measured masses of PSR J1614-2230 and PSR J0348+0432. Furthermore, we analysis the relevance of this studyto heavy-ion collision physics, and proposed some suggestions to distinguish the two scenarios and constraint the strength of quark vector interaction. | |||
TO cite this article:Shao Guo-yun . Transformation from hadronic to quark matter in neutron stars: a comparison of two scenarios[OL].[27 May 2017] http://en.paper.edu.cn/en_releasepaper/content/4735909 |
3. Phase diagram of strongly interacting matter in the improved PNJL model | |||
TANG Zhan-duo,SHAO Guo-yun | |||
Physics 25 May 2017 | |||
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Abstract:Both the chemical potential modification on the Polyakov effectivepotential and the entanglement interactions between the Polyakov-loop and chiral condensate are considered to improved the Polyakov-Nambu-Jona-Lasinio model (PNJL model), which is named the $mu$EPNJL model. Compared with the standard PNJL model, the calculation shows that the range of chiral symmetry phase transition is greatly enlarged in the modified model. The chiral symmetry restoration and deconfinement coincide in a wide range in the $T-mu$ phase diagram, and the critical end point moves towards a smaller chemical potential and higher temperature. Besides, the measurement of the moments of net-proton multiplicity distributions at Relativistic hints that some critical behaviors possibly exists, which also provides a constraint on the relevant model parameters. | |||
TO cite this article:TANG Zhan-duo,SHAO Guo-yun. Phase diagram of strongly interacting matter in the improved PNJL model[OL].[25 May 2017] http://en.paper.edu.cn/en_releasepaper/content/4735961 |
4. Low-lying levels in 130Cs and signature inversion | |||
Hu Xue-Yuan,Guo Hao,Sun Ji,Wang Jia-Qi,Ma Ying-Jun | |||
Physics 14 June 2016 | |||
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Abstract:Excited states of the doubly-odd 130Cs have been investigated via the 124Sn(10B; 4n) and 124Sn(11B; 5n) fusion-evaporation reactions at beam energies of 47 and 58 MeV, respectively. In addition to the previously known high-lying bands, a great deal of low-lying states near the ground state have been identified for the first time. In particular, based on the observation of some new critical linking transitions, the excitaton energy for the (h11/2)p+(h11/2)n band is firrmly determined, allowing a more rigirous spin parity assignment for this band. The excitation energy systematics of (h11/2)+(h11/2)n yrast bands of odd-odd isotopes 118-132Cs is reinvestigated. Discrepancy between the spin assignments for 120,122Cs and 130Cs is briey discussed. | |||
TO cite this article:Hu Xue-Yuan,Guo Hao,Sun Ji, et al. Low-lying levels in 130Cs and signature inversion[OL].[14 June 2016] http://en.paper.edu.cn/en_releasepaper/content/4697859 |
5. Alignment properties of the g7/2 and d5/2 bands in 125Cs | |||
Ma Ying-Jun,Sun Ji | |||
Physics 12 June 2016 | |||
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Abstract:High-spin states in the Z=55 125Cs isotope have been investigated by means of standard in-beam gamma-ray spectroscopy. Gamma-gamma coincidences were measured and a more complete level scheme of 125Cs is constructed. The bands based on the g7/2 and d5/2 configurations at low spins are extended up to spins where they are crossed by two high-lying three-quasiparticle bands. Possible configurations of the three-quasiparticle bands are discussed in the framework of cranked-shell-model calculations and are suggested to be associated with prolate and oblate shapes. In the prolate band, the alignment is assigned to h11/2 neutrons, whereas in the oblate band the alignment of h11/2 protons followed by the alignment of h11/2 neutrons are suggested. | |||
TO cite this article:Ma Ying-Jun,Sun Ji. Alignment properties of the g7/2 and d5/2 bands in 125Cs[OL].[12 June 2016] http://en.paper.edu.cn/en_releasepaper/content/4697839 |
6. Elastic scattering cross sections of the weakly-bound nuclei uc{8}{B} and uc{11}{Be} | |||
YANG Yan-Yun,PANG Dan-Yang | |||
Physics 20 May 2016 | |||
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Abstract:Elastic scattering and breakup reactions of uc{8}{B} and uc{11}{Be} with uc{64}{Zn} and uc{208}{Pb}are systematically analyzed from near to the Coulomb barrier energies to about three times of the Coulomb barrier using the continuum-discretised coupled channels method (CDCC). Systematic differences were found in the angular distributions of the elastic scattering cross sections in these two nuclei. It was found that the suppression of the breakup coupling effects to the elastic scattering cross sections of uc{8}{B} was due to the Coulomb and centrifugal barriers experienced by its valence proton. | |||
TO cite this article:YANG Yan-Yun,PANG Dan-Yang. Elastic scattering cross sections of the weakly-bound nuclei uc{8}{B} and uc{11}{Be}[OL].[20 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4690759 |
7. Test of systematic microscopic nucleon potentials with deuteron stripping reactions | |||
YUN Xiao-Yan,PANG Dan-Yang | |||
Physics 17 May 2016 | |||
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Abstract:Deuteron-stripping reaction is one of the most effective tools to study the single-particle structure of atomic nuclei. Optical model potential(OMP) is one of the most important inputs in the calculations of (d,p) reactions. The relativistic systematic microscopic optical potential(RMOP) based on the Dirac-Brueckner-Hartree-Fock theory is used for calculating the angular distributions of proton elastic scattering and (d,p) reactions with the uc{14}{C}, uc{58}{Ni}, and uc{116}{Sn} targets at both low and higher energies. Neutron spectroscopic factors in the ground states of uc{15}{C}, uc{59}{Ni}, and uc{117}{Sn} are extracted by comparing with experimental data. Comparisons with those obtained using phenomenological systematic optical model potentials, KD02 and CH89 show that the RMOP, which has no free parameters, can give reasonable reproduction to the experimental angular distributions. The spectroscopic factors extracted from experimental data using the RMOP, however, differ from those of KD02 and CH89 systematically. | |||
TO cite this article:YUN Xiao-Yan,PANG Dan-Yang. Test of systematic microscopic nucleon potentials with deuteron stripping reactions[OL].[17 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4688174 |
8. An Explanation for Heavy Quark Energy Loss Puzzle by Flow Effects | |||
Luan Cheng,Enke Wang | |||
Physics 05 May 2016 | |||
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Abstract:The heavy quark energy loss puzzle is explained by collective floweffects in a dynamic medium. The dead cone and LPM effect are foundto be changed comparing to the static medium case. The collectiveflow induces difference of two dead cones in two differentkinds of processes. One is from the projectile emitting gluonprocess, the same as that in the static medium. The other is fromthe gluon emission off the exchanged gluon process, decreasing withincreasing flow velocity $v_z$ along jet direction, which lead tothe increase of heavy quark energy loss. The differences in theeffective average energy loss among charm, bottom and light quarksare very little from a full 3D ideal hydrodynamic simulation for0-10$%$ central Au-Au collisions at RHIC energy. This would yieldsimilar high $p_{T}$ suppressions between light and heavy quarks forcentral Au-Au collisions. | |||
TO cite this article:Luan Cheng,Enke Wang. An Explanation for Heavy Quark Energy Loss Puzzle by Flow Effects[OL].[ 5 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4686432 |
9. The HMT effects on the nucleon collective flows in BUU transport model | |||
ZHANG FANG | |||
Physics 09 November 2015 | |||
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Abstract:Within the framework of a semiclassical Boltzmann-Uehling-Uhlenbeck transport model,the high momentum tail (HMT) effects of nucleon momentum distribution in nucleus on the nucleoncollective flows are studied in semicentral $Au+Au$ collisions. The HMT due to the isospin-dependentshort range correlations(SRC) causes a smaller value of the collective flows. We find that the HMT effects on thenucleon collective flows are remarkable at beam energy of 300 MeV/nucleonand become weak as the incident beam energy increases.The results indicate that for the collective flow studies at intermediate energies, the HMT of nucleon momentumdistribution in nucleus should be taking into account in transport models. | |||
TO cite this article:ZHANG FANG. The HMT effects on the nucleon collective flows in BUU transport model[OL].[ 9 November 2015] http://en.paper.edu.cn/en_releasepaper/content/4660889 |
10. Flow Effects on Jet Energy Loss with Detailed Balance | |||
Luan Cheng,Jia Liu,Enke Wang | |||
Physics 15 December 2014 | |||
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Abstract:In the presence of collective flow a new model potential describingthe interaction of the hard jet with scattering centers is derivedbased on the static color-screened Yukawa potential. The flow effecton jet quenching with detailed balance is investigated in pQCD. Itturns out, considering the collective flow with velocity vz along the jetdirection, the collective flow decreases the LPM destructiveinterference comparing to that in the static medium. The gluonabsorption plays a more important role in the moving medium. The collective flow increases the energy gain from gluon absorption, however,decreases the energy loss from gluon radiation, which is (1-vz) times asthat in the static medium to the first order of opacity. In the presence of collective flow,the second order in opacity correction is relatively small compared to the first order. So that thetotal effective energy loss is decreased. The flow dependence of theenergy loss will affect the suppression of high pT hadronspectrum and anisotropy parameter v2 in high-energy heavy-ioncollisions. | |||
TO cite this article:Luan Cheng,Jia Liu,Enke Wang. Flow Effects on Jet Energy Loss with Detailed Balance[J]. |
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