The ground and excited states of $^{8}$He were investigated with a method of antisymmetrized molecular dynamics(AMD). We adopted effective nuclear interactions which systematically reproduce the binding energies of $^4$He, $^6$He and $^8$He. The ground state of $^8$He has both the $j$-$j$ coupling feature($p_{3/2}$ closure) and the $L$-$S$ coupling feature($^4$He$+2n+2n$) with a slight tail of dineutron at the long distance region. The theoretical results give an indication of the $0^+_2$ state with dineutron gas-like structure. The dineutron structure, $^4$He+$2n$+$2n$, of this state is similar to the $3α$-cluster structure of the $^{12}$C($0^+_2$) state which has been interpreted as an $α$ condensate state. Since the $^8$He($0^+_2$) state has a significant overlap with the dineutron condensate wave function where two dineutrons are moving in $S$ wave around the $α$ core with a dilute density, we suggest that this theoretically predicted $0^+_2$ state is a candidate of the dineutron condensate state.
Multi-neutron correlations in light nuclei via ab-initio lattice simulations
Forschungszentrum Jülich（于利希研究中心）；King Fahd University of Petroleum and Minerals (KFUPM)（法赫德国王石油与矿物大学）；Gaziantep Islam Science and Technology University（加济安泰普伊斯兰科学与技术大学）；Universität Bonn（波恩大学）；Beihang University（北京航空航天大学）
Gluon Condensates, Quark Matter Equation of State and Quark Stars
本文考虑夸克物质状态方程，其中包括奇异夸克，并考虑了胶子凝聚QCD的非平凡真空结构。冷凝函数的参数由热力学势的最小化确定。在零温度和零重子密度的QCD求和规则下，胶子凝聚的标度参数由SVZ参数确定。导出了奇异物质零温状态方程，并利用托尔曼-奥本海默-哈诺夫方程研究了夸克星的结构。得到了夸克星的稳定解，其最大极限为3.2 $M_\odot$，半径约为17 km.
