## 2020年  第37卷  第3期

2020, 37(3).

2020, 37(3).

2020, 37(3).

2020, 37(3): 249-259. doi: 10.11804/NuclPhysRev.37.2019CNPC63

2020, 37(3): 260-271. doi: 10.11804/NuclPhysRev.37.2019CNPC78

We present a brief review of some topical issues in the study of QCD exotic hadrons. A special emphasis of the threshold phenomena is made by taking into account the implementation of the effective field theory study of hadronic molecules and the impact arising from the triangle singularity. A combined analysis may provide some clues towards a better understanding of the hadron spectroscopy.
2020, 37(3): 272-282. doi: 10.11804/NuclPhysRev.37.2019CNPC75

The gravitational waves emitted from a binary neutron star merger, as predicted from general relativistic magneto-hydrodynamics calculations, are sensitive to the appearance of quark matter and the stiffness of the equation of state of QCD matter present in the inner cores of the stars. These astrophysically created extremes of thermodynamics do match, to within 20%, the values of densities and temperatures which are found in relativistic heavy ion collisions, if though at quite different rapidity windows, impact parameters and bombarding energies of the heavy nuclear systems. In this article we combine the results obtained in general relativistic simulations of binary neutron star systems with ones from heavy ion collisions in the lab to pin down the EOS and the phase structure of dense matter. We discuss that the postmerger gravitational wave emission of the neutron star merger remnant might give, in the near future, insides about the properties of the hadron quark transition.

2020, 37(3): 283-290. doi: 10.11804/NuclPhysRev.37.2019CNPC60

2020, 37(3): 291-300. doi: 10.11804/NuclPhysRev.37.2019CNPC34

2020, 37(3): 301-308. doi: 10.11804/NuclPhysRev.37.2019CNPC40

2020, 37(3): 309-316. doi: 10.11804/NuclPhysRev.37.2019CNPC42

2020, 37(3): 317-328. doi: 10.11804/NuclPhysRev.37.2019CNPC39

We provide a short review on some recent developments in the soft and hard probes of quark-gluon plasma(QGP) in high-energy nuclear collisions. The main focus is on the theoretical and phenomenological studies of anisotropic collective flow and jet quenching related to the Relativistic Heavy-Ion Collider(RHIC) and the Large Hadron Collider(LHC). The origin of the collectivity in small collision systems is also briefly discussed. For soft probes, we discuss initial-state fluctuations and geometric anisotropy, the hydrodynamic evolution of the fireball, and final-state anisotropic flows, flow fluctuations, correlations and longitudinal decorrelations. Systematic comparison to experimental data may infer the evolution dynamics and various transport properties of the QGP produced in heavy-ion collisions. For hard probes, we focus on the flavor dependence of parton energy loss and jet quenching, the hadronization of heavy quarks in QGP, full jet evolution in nuclear medium and medium response. Detailed analysis of related observables can help us achieve more comprehensive understanding of jet-medium interaction and heavy flavor production in relativistic nuclear collisions. For small systems, we discuss how initial-state and final-state effects explain the observed collective flows of light and heavy flavor hadrons in proton-nucleus collisions, which is helpful in understanding the origin of the collectivity in large collision systems.
2020, 37(3): 329-363. doi: 10.11804/NuclPhysRev.37.2019CNPC77

2020, 37(3): 364-376. doi: 10.11804/NuclPhysRev.37.2019CNPC36

2020, 37(3): 377-381. doi: 10.11804/NuclPhysRev.37.2019CNPC20

Various theories have predicted the deep Dirac levels (DDLs) in atoms for many years. However, the existence of the DDL is still under debating, and need to be confirmed. With the development of high intensity lasers, nowadays, electrons can be accelerated to relativistic energies by high intensity lasers. Furthermore, electron-positron pairs can be created, and nuclear reactions can be ignited, which provide a new tool to explore the DDL related fields. In this paper, we propose a new experimental method to study the DDL levels by monitoring nuclei's orbital electron capture life time in plasma induced by high intensity lasers. The present study reveal that if a DDL exists, a nuclear electron capture rate could be enhanced by factor of over \begin{document}$10^7$\end{document}, which makes it a very sensitive method for the DDL detecting.
2020, 37(3): 382-390. doi: 10.11804/NuclPhysRev.37.2019CNPC57

2020, 37(3): 391-405. doi: 10.11804/NuclPhysRev.37.2019CNPC79

2020, 37(3): 406-413. doi: 10.11804/NuclPhysRev.37.2019CNPC52

The spectrum of hadrons is important for understanding the confinement of quantum chromodynamics. Many new puzzles arose since 2003 due to the abundance of experimental discoveries with the \begin{document}$XYZ$\end{document} structures in the heavy quarkonium mass region being the outstanding examples. Hadronic resonances correspond to poles of the \begin{document}$S$\end{document}-matrix, which has other types of singularities such as the triangle singularity due to the simultaneous on-shellness of three intermediate particles. Here we briefly discuss a few possible manifestations of triangle singularities in the \begin{document}$XYZ$\end{document} physics, paying particular attention to the formalism that can be used to analyze the data for charged \begin{document}$Z_c$\end{document} structures in the \begin{document}$\psi\pi$\end{document} distributions of the reaction \begin{document}$e^+e^-\to \psi\pi^+\pi^-$\end{document}.
2020, 37(3): 414-425. doi: 10.11804/NuclPhysRev.37.2019CNPC29

2020, 37(3): 426-437. doi: 10.11804/NuclPhysRev.37.2019CNPC09

2020, 37(3): 438-446. doi: 10.11804/NuclPhysRev.37.2019CNPC69

2020, 37(3): 447-454. doi: 10.11804/NuclPhysRev.37.2019CNPC18

Recently, isomeric states are discovered for the first time in 101In, 123,125Ag, and 218Pa. The nuclear shell model is used to explain the underlying physics in these and related isomers in In, Ag isotopes, and the \begin{document}$N\!=\!127$\end{document} isotones. The observed excitation energies of the \begin{document}$1/2^{-}$\end{document} isomeric states in odd-A In isotopes, 101-109In, are rather similar among five isotopes, which can be explained by introducing the strong neutron configuration mixing between the \begin{document}$0g_{7/2}$\end{document} and \begin{document}$1d_{5/2}$\end{document} orbitals. In addition, from the \begin{document}$9/2^{+}$\end{document} ground state to the \begin{document}$1/2^{-}$\end{document} isomeric state in these odd-A In isotopes, a proton moves from the \begin{document}$1p_{1/2}$\end{document} orbital to the \begin{document}$0g_{9/2}$\end{document} orbital, which may induce the change on the single particle energies of the neutron \begin{document}$0g_{7/2}$\end{document} and \begin{document}$1d_{5/2}$\end{document} orbitals. Such configuration dependent shell evolution in one nucleus is called the type II shell evolution. Similar to In isotopes, the isomeric states in 123,125Ag are found to be the \begin{document}$1/2^{-}$\end{document} states, which correspond to a proton hole in \begin{document}$1p_{1/2}$\end{document} orbital. But \begin{document}$1/2^{-}$\end{document} states are ground states in 115,117Ag, which indicates an inversion of the proton \begin{document}$1p_{1/2}$\end{document} and \begin{document}$0g_{9/2}$\end{document} orbitals around \begin{document}$N\!=\!72$\end{document}. The shell-model analysis shows that the tensor force is the key reason of the inversion of the two orbitals. \begin{document}${\rm A}~1^{-}$\end{document} ground state and a high spin isomeric state are observed previously along the odd-odd \begin{document}$N\!=\!127$\end{document} isotones, 210Bi, 212At, 214Fr, and 216Ac. However, the ground state and the newly discovered isomeric state of 218Pa are suggested to be \begin{document}$8^{-}$\end{document} and \begin{document}$1^{-}$\end{document}, respectively, based on the properties of \begin{document}$\alpha$\end{document} decay and the shell-model calculations. The evolution of the ground states and isomeric states along the odd-odd \begin{document}$N\!=\!127$\end{document} isotones are caused by the transition of the proton-neutron interaction from particle-particle type to hole-particle type and the proton configuration mixing. In general, the nuclear shell model gives nice descriptions on these newly discovered isomeric states in nuclei around the doubly magic nuclei 100Sn, 132Sn, and 208Pb. The isomeric states in nuclei around doubly magic nuclei, so called the shell-model isomers, are of high importance in the nuclear structure study, because they often provide the first spectroscopic properties in the extreme neutron-rich and neutron-deficient nuclei in the medium and heavy mass region and include a plenty of information in physics, such as the proton-neutron interaction and its role in shell evolution.

2020, 37(3): 455-461. doi: 10.11804/NuclPhysRev.37.2019CNPC44

2020, 37(3): 462-469. doi: 10.11804/NuclPhysRev.37.2019CNPC05

2020, 37(3): 470-477. doi: 10.11804/NuclPhysRev.37.2019CNPC31

2020, 37(3): 478-491. doi: 10.11804/NuclPhysRev.37.2019CNPC61

2020, 37(3): 492-499. doi: 10.11804/NuclPhysRev.37.2019CNPC62

2020, 37(3): 500-508. doi: 10.11804/NuclPhysRev.37.2019CNPC70

2020, 37(3): 509-515. doi: 10.11804/NuclPhysRev.37.2019CNPC10

In this paper we study low-lying states of even-even nuclei in the sd and pf shells in the framework of the shell model with the phenomenological pairing plus quadrupole-quadrupole (P+Q) interaction. By adopting the single-particle energy and the monopole interaction from the USDB and GXPF1 interactions, the low-lying spectra of spherical nuclei and deformed nuclei are successfully reproduced by a unified set of parameters. We obtain a reasonably good result for binding energies by removing the monopole component from the pairing interactions. The isoscalar pairing interaction does not play an important role in the states. The monopole interaction provides contributions to the empirical proton-neutron interaction, the symmetry energy, and the Wigner energy.
2020, 37(3): 516-522. doi: 10.11804/NuclPhysRev.37.2019CNPC45

2020, 37(3): 523-529. doi: 10.11804/NuclPhysRev.37.2019CNPC15

2020, 37(3): 530-535. doi: 10.11804/NuclPhysRev.37.2019CNPC43

2020, 37(3): 536-541. doi: 10.11804/NuclPhysRev.37.2019CNPC49

2020, 37(3): 542-547. doi: 10.11804/NuclPhysRev.37.2019CNPC17

The present work aims at the structural investigation of the \begin{document}$\gamma-$\end{document} levels in \begin{document}$\nu h_{11/2}$\end{document} band of 101Pd, and its comparison with the neighboring Pd-isotopes. Theoretical investigations performed in the vicinity of Pd-isotopes i.e., around \begin{document}$N\!=\!Z\!=\!50$\end{document} shell closures have described the systematic well, indicating an evolution of shape alongwith involvement of triaxiality. The deformation studies in the vicinity of Pd-isotopes around shell closures have predicted the shape change from small deformation to more deformed prolate shapes. The comparison of Total Routhian Surface (TRS) calculations performed in the present work have also suggested the inclusion of small amount of triaxiality as a function of increasing rotational frequency and neutron number, pointing towrads the \begin{document}$\gamma-$\end{document} softness present in the nuclei.
2020, 37(3): 548-553. doi: 10.11804/NuclPhysRev.37.2019CNPC55

2020, 37(3): 554-562. doi: 10.11804/NuclPhysRev.37.2019CNPC08

2020, 37(3): 563-568. doi: 10.11804/NuclPhysRev.37.2019CNPC54

2020, 37(3): 569-573. doi: 10.11804/NuclPhysRev.37.2019CNPC59

An independent theoretical analysis is presented for the 2 band in 248Cf, which has been identified to spin \begin{document}$25{\hbar}$\end{document} and excitation energy \begin{document}$\geqslant$\end{document}4 MeV, implying the fission barrier persists at least up to that angular momentum and excitation for the configuration. The underlying physics for the experimentally observed band is discussed in terms of alignment properties and decay pattern. Different scenarios for assumptions about intrinsic configuration are assessed with transition rates analysis. It turns out that only by invoking a particle-phonon mixing picture can the decay characteristics of the pair of bands be well accounted for, i.e. quasiparticle nature forbids decay to ground-state band, non-axial octupole phonon shifts the signature partners in energy and diminishes mutual interaction. The coexisting normal and superconducting phases are tentatively attributed to weak neutron pairing in the proximity of 152 deformed shell gap.

2020, 37(3): 574-579. doi: 10.11804/NuclPhysRev.37.2019CNPC07

2020, 37(3): 580-585. doi: 10.11804/NuclPhysRev.37.2019CNPC11

2020, 37(3): 586-594. doi: 10.11804/NuclPhysRev.37.2019CNPC68

We apply the coupled-channel Gamow shell model to calculate the spectra of 17O and 17F, as well as 16O(p,p) elastic cross sections at low energies. It is shown that continuum coupling is necessary to account for the particle-emission width of the unbound eigenstates of 17O and 17F. The low-lying spectrum of 17O and 17F and 16O(p,p) excitations functions are in fair agreement with experimental data. Nevertheless, it is also shown that the use of a realistic nuclear Hamiltonian is needed to have an optimal reproduction of 16O(p,p) elastic cross sections in the low-energy region.
2020, 37(3): 595-599. doi: 10.11804/NuclPhysRev.37.2019CNPC25

With the application of the notch technique, the radial sensitive regions for the tightly bound system 16O+208Pb, and weakly bound system 9Be+208Pb were investigated. It is the first time that the shape and resonant scattering can be identified from the sensitivity functions. Moreover, strong energy dependence of sensitive regions were found for both the tightly and stable weakly bound systems: in the above barrier region, the sensitive region varies around the strong absorption radius; while below the barrier, the behavior of sensitive region is close to that of the closest approach in the Coulomb field.

2020, 37(3): 600-604. doi: 10.11804/NuclPhysRev.37.2019CNPC16

2020, 37(3): 605-610. doi: 10.11804/NuclPhysRev.37.2019CNPC56

2020, 37(3): 611-616. doi: 10.11804/NuclPhysRev.37.2019CNPC26

2020, 37(3): 617-620. doi: 10.11804/NuclPhysRev.37.2019CNPC48

2020, 37(3): 621-625. doi: 10.11804/NuclPhysRev.37.2019CNPC21

2020, 37(3): 626-635. doi: 10.11804/NuclPhysRev.37.2019CNPC28

2020, 37(3): 636-642. doi: 10.11804/NuclPhysRev.37.2019CNPC47

2020, 37(3): 643-649. doi: 10.11804/NuclPhysRev.37.2019CNPC71

74Ge(n,\begin{document}$\gamma$\end{document})反应是大质量恒星氦核心和碳燃烧壳层弱s-过程中的关键反应，76Ge(n,\begin{document}$\gamma$\end{document})反应是弱r-过程中的重要反应。两反应决定了宇宙中74,76Ge的丰度。同时74,76Ge(n,\begin{document}$\gamma$\end{document})反应又是国际上正在开展的GERDA组和MAJORANA组76Ge无中微子双\begin{document}$\beta$\end{document}衰变实验中需要精确测量的中子诱导的主要本底反应。当前已有的实验数据受实验条件或中子能区的限制，存在精度不高且部分能区缺失的情况。本工作计划基于中国散裂中子源(CSNS)反角通道白光中子源实验终端很宽的能谱以及优异的时间结构特性，应用C\begin{document}$_{6}$\end{document}D\begin{document}$_{6}$\end{document}探测器开展74,76Ge中子俘获反应的高精度测量研究，给出10 keV\begin{document}$\thicksim 5$\end{document} MeV能区的截面值。特别是天体物理最关注的30 keV附近能区反应截面的直接测量工作，将为理解大质量恒星s-/r-过程提供关键的核物理输入量，帮助解决美国国家科学委员会于2002年在《发现》杂志上提出的21世纪尚未解决的11个重大物理问题之三，“从铁到铀的元素是如何产生的？”这一重大物理问题。同时，为正在开展的分别位于意大利格兰萨索地下实验室GERDA合作组和位于美国桑福德地下实验室MAJORANA合作组76Ge核0\begin{document}$\nu \beta \beta$\end{document}实验、以及锦屏深地实验室(CJPL)清华大学中国暗物质实验合作组(CDEX)未来吨量级的高纯锗探测器0\begin{document}$\nu \beta \beta$\end{document}实验研究，提供精确的本底反应数据。
2020, 37(3): 650-659. doi: 10.11804/NuclPhysRev.37.2019CNPC22

2020, 37(3): 660-667. doi: 10.11804/NuclPhysRev.37.2019CNPC04

2020, 37(3): 668-673. doi: 10.11804/NuclPhysRev.37.2019CNPC72

2020, 37(3): 674-678. doi: 10.11804/NuclPhysRev.37.2019CNPC65

We review our recent studies on chiral crossover and chiral phase transition temperatures in this special issue. We will firstly present a lattice QCD based determination of the chiral crossover transition temperature at zero and nonzero baryon chemical potential \begin{document}$\mu_{\rm{B}}$\end{document} which is \begin{document}$T_{\rm{pc}}\!=\!(156.5\pm1.5)$\end{document} MeV. At nonzero temperature the curvatures of the chiral crossover transition line are \begin{document}$\kappa^{\rm{B}}_2$\end{document}=0.012(4) and \begin{document}$\kappa^{\rm{B}}_4$\end{document}=0.000(4) for the 2nd and 4th order of \begin{document}$\mu_{\rm{B}}/T$\end{document}. We will then present a first determination of chiral phase transition temperature in QCD with two degenerate, massless quarks and a physical strange quark. After thermodynamic, continuum and chiral extrapolations we find the chiral phase transition temperature \begin{document}$T_{\rm{c}}^0\!=\!132^{+3}_{-6}$\end{document} MeV.
2020, 37(3): 679-683. doi: 10.11804/NuclPhysRev.37.2019CNPC19

We have studied the relativistic Kelvin circulation theorem for ideal Magnetohydrodynamics. The relativistic Kelvin circulation theorem is a conservation equation for the called T-vorticity, We have briefly reviewed the ideal magnetohydrodynamics in relativistic heavy ion collisions. The highlight of this work is that we have obtained the general expression of relativistic Kelvin circulation theorem for ideal Magnetohydrodynamics. We have also applied the analytic solutions of ideal magnetohydrodynamics in Bjorken flow to check our results. Our main results can also be implemented to relativistic magnetohydrodynamics in relativistic heavy ion collisions.
2020, 37(3): 684-689. doi: 10.11804/NuclPhysRev.37.2019CNPC13

Heavy quarks (charm and beauty), especially beauty, with expectedly different properties from light quarks are considered as ideal probes for the Quark-Gluon Plasma (QGP). However, there are few measurements on beauty hadrons or on their decay leptons. With the most recent measurements on charmed hadrons and heavy flavor decay electrons (HFE) at mid-rapidity in Au+Au collisions at \begin{document}$\sqrt{s_{\rm NN}}=200\;{\rm{GeV}}$\end{document} at RHIC, a data-driven method is developed to separate charm and beauty components from the HFE measurements. From charmed hadron measurements, electrons from charm decays via semileptonic decay simulations are obtained, with which the beauty component can be extracted from the HFE spectrum. As preliminary results, the \begin{document}$p^{}_{\rm T}$\end{document} spectra, \begin{document}$R_{\rm AA}$\end{document} and \begin{document}$v_2$\end{document} distributions of electrons from charm and from beauty decays (\begin{document}$R_{\rm AA}^{\rm c\rightarrow e}$\end{document} and \begin{document}$v_2^{\rm c\rightarrow e}$\end{document}, \begin{document}$R_{\rm AA}^{\rm b\rightarrow e}$\end{document} and \begin{document}$v_2^{\rm b\rightarrow e}$\end{document}) in minimum bias Au+Au collisions are presented, respectively. Less suppression of \begin{document}$R_{\rm AA}^{\rm b\rightarrow e}$\end{document} is observed compared with that of \begin{document}$R_{\rm AA}^{\rm c\rightarrow e}$\end{document} at moderate-to-high \begin{document}$p_{\rm T}$\end{document}, and \begin{document}$v_2^{\rm b\rightarrow e}$\end{document} shows smaller than \begin{document}$v_2^{\rm c\rightarrow e}$\end{document} at low-to-moderate \begin{document}$p_{\rm T}$\end{document}.
2020, 37(3): 690-697. doi: 10.11804/NuclPhysRev.37.2019CNPC33

This paper present a review on the dynamically generated sea quark and gluon distributions in the free nucleon and the cold nuclear medium. In the dynamical parton model, all the sea quarks and gluons come purely from the QCD fluctuations with DGLAP equations, where the small components of intrinsic sea quarks are neglected. The three valence quark distributions from maximum entropy method are taken as the nonperturbative input at \begin{document}$Q_0^2\sim 0.1$\end{document} GeV2. The saturated strong coupling at low \begin{document}$Q^2$\end{document} (\begin{document}$<1$\end{document} GeV2) is used in this work. Nucleon swelling and parton-parton recombination enhancement are considered for the nuclear matter. The dynamical parton distributions of both nucleon and cold nuclear matter are consistent with the experiments. Furthermore, we show a preliminary application of the nuclear parton distributions in the extraction of the parton energy loss penetrating in the cold nuclear medium.
2020, 37(3): 698-704. doi: 10.11804/NuclPhysRev.37.2019CNPC24

A novel algebraic approach recently proposed is presented in this paper for investigating the \begin{document}$\tau$\end{document} lepton decay process. In this approach, we use the basic weak interaction and angular momentum algebra and finally obtain analytical decay amplitudes, finding that this formalism can relate the different decay processes and also lead to a different interpretation of the important role played by \begin{document}$G$\end{document}-parity in these decays. Then we apply this formalism to explore some meaningful and interesting applications on \begin{document}$\tau$\end{document} lepton decays, including the polarization amplitudes and tests on the nature of scalar resonances or axial-vector resonances. The results show that one magnitude is very sensitive to the \begin{document}$\alpha$\end{document} parameter and useful to test different models Beyond the Standard Model. And very importantly, we firstly open up a new direction in the \begin{document}$\tau$\end{document} decays to test the nature of resonances which were obtained as dynamically generated from the pseudoscalar-pseudoscalar or vector-pseudoscalar interactions. In these \begin{document}$\tau$\end{document} decays we make predictions for invariant mass distribution and the final branching ratios, the results show that these ratios are within measurable ranges on related experiments in the possible future large research facility of the Super Tau-Charm Facility of China.
2020, 37(3): 705-712. doi: 10.11804/NuclPhysRev.37.2019CNPC23

The critical exponents at the Critical end Point(CEP) and the spinodal boundaries are investigated in the Poyakov-Nambu--Jona-Lasinio(PNJL) model. The numerical results show that the four standard critical exponents, \begin{document}$\alpha, \beta, \gamma$\end{document} and \begin{document}$\delta$\end{document}, are consistent with Landau-Ginzburg theory in the mean-field approximation. The critical exponent \begin{document}$\eta ~(\approx2)$\end{document} correlated to kurtosis is larger than the critical exponent \begin{document}$\zeta~(\approx1)$\end{document} of skewness at the CEP, which indicates that the measurement of kurtosis is more sensitive than skewness if the critical region can be reached in heavy-ion collision. The calculation also shows that the critical exponent of skewness~(kurtosis) along the spinodal line has the same divergent strength as that at the CEP. Due to the violent fluctuations in the unstable and metastable phases and the divergence of skewness and kurtosis at the spinodal boundaries, the signals to identify the first-order transition in the future experiments will be disturbed to a certain degree. Some deviations from the prediction of standard first-order transition may be found in observation.
2020, 37(3): 713-719. doi: 10.11804/NuclPhysRev.37.2019CNPC35

\begin{document}${\mathbb{Z}}_3$\end{document}-QCD是具有严格中心对称性的类QCD理论，研究其在特殊条件下的性质有助于理解QCD退禁闭相变。本文应用三种味道的Polyakov-loop拓展的夸克介子模型作为\begin{document}${\mathbb{Z}}_3$\end{document}-QCD的低能有效理论，研究了不同中心对称性破缺模式下的Roberge-Weiss(RW)相变。为保证RW周期性，本文采用味道依赖的虚化学势\begin{document}$(\mu_{\rm{u}},\mu_{\rm{d}},\mu_{\rm{s}})={\rm{i}}T(\theta-2C\pi/3,\theta,\theta+2C\pi/3)$\end{document}，其中\begin{document}$0\!\leqslant\!{C}\!\leqslant1$\end{document}。传统的和夸克反馈效应改进的两种不同Polyakov-loop势被分别用于相应的计算。研究表明，当\begin{document}$N_{\rm{f}}\!=\!3$\end{document}\begin{document}$C\!\ne\!1$\end{document}时，RW相变出现在\begin{document}$\theta=\pi/3$\end{document}(mod \begin{document}$2\pi/3$\end{document})处，其强度随\begin{document}$C$\end{document}值的减小而加强；当\begin{document}$C\!=\!1$\end{document}\begin{document}$N_{\rm{f}}\!=\!2\!+\!1$\end{document}时，RW相变位置出现反常，变为\begin{document}$\theta=2\pi/3$\end{document}(mod \begin{document}$2\pi/3$\end{document})；而当\begin{document}$C\!=\!1$\end{document}\begin{document}$N_{\rm{f}}\!=\!1\!+\!2$\end{document}时，RW相变点又返回\begin{document}$\theta\!=\!\pi/3$\end{document}(mod \begin{document}$2\pi/3$\end{document})。上述几种情形的RW相变端点均为三相点。研究发现，夸克反馈效应使得RW相变强度减弱，退禁闭相变温度变低，但并未改变前述的定性结论。

2020, 37(3): 720-726. doi: 10.11804/NuclPhysRev.37.2019CNPC41

2020, 37(3): 727-733. doi: 10.11804/NuclPhysRev.37.2019CNPC37

2020, 37(3): 734-741. doi: 10.11804/NuclPhysRev.37.2019CNPC51

2020, 37(3): 742-748. doi: 10.11804/NuclPhysRev.37.2019CNPC27

ANAETF, a large data analysis framework for the External Target Facility (ETF) of HIRFL-CSR, has been developed and successfully used for data analysis in radioactive ion beam experiments. This paper covers the flow of data processing in the program, the general tracking algorithm for the drift chambers, the particle identification (PID) approach, and the techniques for extraction of reaction cross sections. The program achieves total detecting efficiencies of around ~90% and gives clear PID spectrum for carbon and beryllium fragments produced from the reaction of 240 MeV/u 12C secondary beams on a carbon target. The obtained cross sections are consistent with the previously reported experimental results.

2020, 37(3): 749-756. doi: 10.11804/NuclPhysRev.37.2019CNPC53

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2020, 37(3): 784-790. doi: 10.11804/NuclPhysRev.37.2019CNPC01

2020, 37(3): 791-796. doi: 10.11804/NuclPhysRev.37.2019CNPC76

2020, 37(3): 797-803. doi: 10.11804/NuclPhysRev.37.2019CNPC73

2020, 37(3): 804-808. doi: 10.11804/NuclPhysRev.37.2019CNPC02