丰中子Z=96—102同位素链的N=184闭壳

在相对论平均场理论框架下, 首先证明了对力强度存在明显的壳效应, 然后用此方法研究了Z=96—102区域内超重同位素链中中子壳封闭问题, 证明了在超重元素中,N=184处确实存在壳封闭. 并据此给出了一种检验壳封闭的新方法.     

稀土区对力强度的研究

在相对论平均场框架下系统地研究了稀土区同位素链的对力强度, 首次发现了 中子的对力强度G_n在中子幻数N=82处突然增大以及质子的对力强度G_p和中子的奇、偶性有关的特性, 证明了对力强度本质上是和核的壳层结构紧切相关. 另外, 还给出了计算对力强度G_n和G_p的一般公式.     

An efficient method for preparing the sphingosine-1-phosphate receptor agonist, KRP203-phosphate

An efficient method for mono-phosphorylation of 2(KRP203)using cbz-protection,dibenzylphosphoryl chloride and TMSI affording 2-P(KRP203-P)was developed.We applied the present method to the synthesis of KRP203 phosphate analogs which were difficult to produce through tradition procedures.     

热处理对富氮碳纳米纤维结构及储锂性能的影响

以聚丙烯腈(PAN)为原料,经静电纺丝、稳定化和碳化,制备了碳纳米纤维(CNFs)。系统地研究了氮的种类及含量对锂离子电池(LIBs)中Li+的储存性能和负极容量的影响。碳化过程中纤维从无定形碳向石墨化碳结构转变,含氮官能团减少,结构的变化对Li+在CNFs电极中的存储位置有很大的影响。结果表明,Li+不仅可以存储在石墨化碳层之间,还可以存储在氮功能化引起的缺陷部位,后者主要是由于碳材料的氮掺杂而使LIBs的电化学性能改善。碳化温度为600℃时,可以产生足够高的氮含量,从而提高电极的容量。在电流密度为0.1 A·g^-1时,循环200次之后比容量高达560 mAh·g^-1,即使在1 A·g^-1的高电流密度下,循环1000次比电容量仍然保持在200 mAh·g^-1。     

配合物Ni(Pybox) (SCN)2(CH3OH)的合成、表征与晶体结构

本文合成了含N原子的三齿配体2,6-吡啶二噁唑啉(Pybox),由Pybox与NiCl2·6H2O和KSCN在甲醇溶液中反应制得标题配合物Ni(Pybox)(SCN)2(CH3OH),并进行了元素分析、红外光谱、电子光谱、X-射线衍射等表征.结果表明:此配合物属单斜晶系,空间群为P2(1)/n,晶体学参数为:a=7.9...     

Shape coexistence in 76Se within the neutron–proton interacting boson model

We have investigated the low-lying energy spectrum and electromagnetic transition strengths in even–even ⁷⁶Se using the proton–neutron interacting boson model (IBM-2). The theoretical calculation for the energy levels and E2 and M1 transition strengths is in good agreement with the experimental data. Specifically, the excitation energy and E2 transition of ${0}_{2}^{+}$ state, which is intimately associated with shape coexistence, can be accurately reproduced. The analysis on low-lying states and the key structure indicators R₁, R₂, R₃ and R₄ and M1 transitions indicates that there is a coexistence between spherical shape and γ-soft shape in ⁷⁶Se.     

Description of Properties of Triaxial Superdeformed Bands in Odd-A Lu Isotopes

Properties of the triaxial superdeformed （TSD） bands of odd-A Lu isotopes are investigated systematically within the supersymmetry scheme including many-body interactions and a perturbation possessing the S0（5） （or SU（5）） symmetry on the rotational symmetry. Quantitatively good results of the γ-ray energies, the dynamical moments of inertia and the spin of the TSD bands in odd-A Lu isotopes are obtained. The calculation shows that the competition between the pairing and anti-pairing effects exists in these TSD bands. Meanwhile, the SU（3） symmetry in TSD bands are broken more seriously than in superdeformed （SD） bands.     

Beam test of CSES silicon strip detector module

The silicon-strip tracker of the China Seismo-Electromagnetic Satellite(CSES) consists of two doublesided silicon strip detectors(DSSDs) which provide incident particle tracking information.A low-noise analog ASIC VA140 was used in this study for DSSD signal readout.A beam test on the DSSD module was performed at the Beijing Test Beam Facility of the Beijing Electron Positron Collider(BEPC) using a 400–800 MeV/c proton beam.The pedestal analysis results,RMSE noise,gain correction,and intensity distribution of incident particles of the DSSD module are presented.     

用相对论平均场理论研究近滴线区原子核传统幻数的消失和新幻数的产生

提出了一种从理论上检验壳效应的方法.在考虑了由Bardeen，Cooper和Schrieffer提出的金属超导理论(BCS方法)的相对论平均场理论框架内，通过计算粒子数的涨落，发现涨落的大小和核的壳结构有紧密的关系，进而研究了滴线区一些传统幻数的消失和新幻数的产生. 关键词： 相对论平均场理论 粒子数涨落 幻数 壳效应     

关于原子核奇偶质量差和能隙的研究

系统分析了奇偶核质量差公式的适用性及与能隙参数的关系. 计算了核素Sn和Pb附近10个同位素链的中子奇偶质量差Δ(3)n, 发现壳效应、核子对相互作用、核的形变都会明显影响Δ(3)n的数值, 并在此基础上, 给出了一个修正的奇偶核质量差公式.