We discuss the effect of surface energy coefficients as well as nuclear surface diffuseness in the proximity potential and ultimately in the fusion of heavy-ions. Here we employ different versions of surface energy coefficients. Our analysis reveals that these technical parameters can influence the fusion barriers by a significant amount. A best set of these parameters is also given that explains the experimental data nicely.
Surface diffuseness anomaly in heavy-ion potentials for large-angle quasielastic scattering
最近的高精度实验数据的重离子聚变反应在亚势垒能量系统地表明，一个令人惊讶的大的表面扩散参数的伍兹-撒克逊势是必需的，以适应的数据。我们指出，在向后的角度准弹性散射的实验数据也有利于类似的大值的表面扩散参数。因此，双折叠的方法无法重现的准弹性散射的$^{16}$ O + $^{154}$ Sm系统在库仑势垒附近的能量的实验激发函数。我们还表明，在深亚势垒能量的准弹性的卢瑟福截面从统一的比率的偏差提供了一个明确的方式来确定的表面扩散参数的值在核-核势。
Time-Depentent Hartree-Fock description of heavy ions fusion
在含时Hartree-Fock（TDHF）理论框架下，采用Skyrme相互作用和SLy 4d参数化，对重离子聚变进行了微观平均场描述.一个很好的协议与实验上的融合障碍的位置，各种总质量，质量不对称性和变形。16 O +208 Pb的激发函数在势垒以上被高估了约16%。在平均场动力学中，对独立粒子态的限制阻碍了对亚势垒熔合的描述。讨论了转移对熔合的影响。
Coupled-Channel Effects in Collisions between Heavy Ions near the Coulomb Barrier
近年来，随着重离子稳定束和放射性核束的出现，重离子核反应的研究又引起了人们的兴趣。我首先介绍的作用，非弹性和转移通道耦合在聚变反应引起的稳定重离子。本文讨论了用标准耦合道计算方法分析实验熔合截面的问题。以$^{32}$ S + $^{90,96}$ Zr为基准反应，研究了多中子转移在库仑势垒以下聚变过程中的作用.利用NTFus程序计算了$^{32}$ S + $^{96}$ Zr在亚势垒能区的熔合截面的增强，其中包括中子转移通道的耦合，采用Zagrebaev半经典模型。对$^{40}$ Ca + $^{90}$ Zr和$^{40}$ Ca + $^{96}$ Zr的熔合激发函数也发现了类似的效应，同时还发现了在弹性散射和熔合过程中由弱束缚稳定射弹引起的破碎耦合也是至关重要的.在这个讲座中，全耦合通道计算的聚变激发函数进行分裂耦合的中子更丰富的反应和更弱的约束射弹。我清楚地表明，连续离散耦合通道计算是能够再现的$^{6}$锂+$^{59}$公司的分裂耦合的融合增强。
Systematic study of the effect of individual rotational energy levels on the fusion cross-section of \texorpdfstring{$^{16}O$}--based reactions of range $480 \le {Z_PZ_T} \le 592$
Experimental above-barrier fusion cross-sections for $^{17}$F + $^{12}$C are compared to the fusion excitation functions for $^{16,18}$O, $^{19}$F, and $^{20}$Ne ions on a carbon target. In comparing the different systems both the differing static size of the incident ions and changes in fusion barrier are accounted for by examining the reduced fusion cross-section. Remaining trends of the fusion cross-section above the barrier which reflect the sensitive interplay of the sd protons and neutrons are observed. The experimental data are also compared to both a widely-used analytical model of nea…
Beam filamentation instability drives deuterium-tritium fusion with polarized neutron emission
State Key Laboratory of Nuclear Physics and Technology, Peking University（北京大学核物理与技术国家重点实验室）；Institute of Theoretical Physics, Chinese Academy of Sciences（中国科学院理论物理研究所）；College of Physics, Sichuan University（四川大学物理学院）；Beijing Laser Acceleration Innovation Center（北京激光聚变创新中心）
A new framework is proposed for the study of collisions between very heavy ions which lead to the synthesis of Super-Heavy Elements (SHE), to address the fusion hindrance phenomenon. The dynamics of the reaction is studied in terms of collective degrees of freedom undergoing relaxation processes with different time scales. The Nakajima-Zwanzig projection operator method is employed to eliminate fast variable and derive a dynamical equation for the reduced system with only slow variables. There, the time evolution operator is renormalised and an inhomogeneous term appears, which represents a pr…
The two stages dynamical stochastic model developed earlier for description of fusion-fission reactions is applied to the calculation of mass- and energy-distributions of fission fragments of platinum isotopes in reaction ${\rm ^{36}Ar + ^{142}Nd \to ^{178-x}Pt + xn}$. The first stage of this model is the calculation of the approaching of projectile nucleus to the target nucleus. On the second stage of the model, the evolution of the system formed after the touching of the projectile and target nuclei is considered. The evolution of the system on both stages is described by three-dimensional L…
In the collision of two heavy ions, the strong repulsion coming from the Coulomb field is enough to produce $e^+e^-$ pair(s) from vacuum fluctuations. The energy is provided by the kinetic energy of the ions and the Coulomb interaction at the production point. If, for instance, the electron is located at the center of mass (C.M.) of the two ions moving along the \emph{z}-axis, and the positron is at a distance \emph{x} from the electron, the ions can be accelerated towards each other since the Coulomb barrier is lowered by the presence of the electron. This screening results in an increase in …
Measurement of the energy dependence of the fusion cross-sec on at sub-barrier energies provides an important test for theoretical models of fusion. To extend the measurement of fusion cross-sections in the sub-barrier domain for the 18O+12C system. Use the new experimental data to confront microscopic calculations of fusion. Evaporation residues produced in fusion of 18O ions with 12C target nuclei were detected with good geometric efficiency and identified by measuring their energy and time-of-flight. Theoretical calculations with a density constrained time dependent Hartree-Fock (DC-TDHF) t…
We study the azimuthal angular decorrelation of the dijet production via photon fusion in ultra-peripheral heavy ion collisions. The impact parameter dependent cross section of quark-antiquark pairs production is derived using the equivalent photon approximation, and the contribution from final-state QCD radiations to the azimuthal angular distribution are calculated within Soft-Collinear Effective Theory. We carry out the QCD resummation of large logarithms of the azimuthal angle as well as the jet radius at next-to-leading logarithmic accuracy. In the end we present the normalized differenti…
Higgs boson production in partonic and electromagnetic (photon-photon) interactions of light- and heavy-ions (A-A) at the LHC and future colliders is summarized. Parton-induced cross sections --including gluon-gluon, vector-boson fusion, and associated W, Z, t processes-- are computed at NNLO with MCFM 8.0 using nuclear parton distribution functions. Photon-photon cross sections are computed with MadGraph 5.0 for ultraperipheral A-A interactions with both ions surviving the collision. In the center-of-mass energy range $\sqrt{s} \approx 5$--100 TeV, the ratio of electromagnetic-to-partonic Hig…
