Magnetic rotation in 106Ag

The high spin states of ¹⁰⁶Ag were populated via the fusion-evaporation reaction ¹⁰⁰Mo(¹¹B,5n)¹⁰⁶Ag at a beam energy of 60 MeV. A new level scheme of ¹⁰⁶Ag is presented. The positive parity band based on the configuration of πg_9/2⊙ν[h²_11/2(g_7/2/d_5/2)] is assigned to magnetic rotation band of shears mechanism. Theoretical calculation of the effective interaction on the basis of TAC mode were also performed, the calculated results agrees well with the value extracted from the experiment.     

应用同步辐射XRF分析胎毛中铅含量

通过同步辐射微束XRF分析了9名婴儿头发中的铅含量,结果表明,该法可了解胎儿在孕育期内体内铅含量的变化情况,甚至胎儿体内每天的铅含量的变化。通过分析铅在胎毛中含量的变化曲线,可以追踪孕妇在某段时期铅的接触史。     

New band structures in ~（107）Ag

High spin states in ¹⁰⁷Ag are studied via the ¹⁰⁰Mo(¹¹B, 4n)¹⁰⁷Ag reaction at an incident beam energy of 60 MeV. Prompt γ-γ coincidence and DCO ratios are measured by the detector arrays in CIAE. The level scheme has been updated and a new negative band belonging to ¹⁰⁷Ag is identified. The new negative side band has been constructed and its configuration is tentatively assigned to πg_9/2 νh_11/2(g_7/2/d_5/2).     

海产品铅污染状况以及铅的生物有效性研究进展

近海环境铅污染日益严重,就近期海产品铅污染状况及铅的生物有效性方面的研究进展做一综述。     

高自旋态下160Lu能级自旋的确定

通过¹⁴⁴Sm(¹⁹F,3n)反应对¹⁶⁰Lu高自旋态进行了研究.首次建立了¹⁶⁰Lu高自旋态能级纲图.依据相加性法则对¹⁶⁰Lu各能级的自旋及宇称进行了讨论.     

171Lu 1/2－[541]轨道的形变驱动作用

通过熔合蒸发反应¹⁶⁰Gd(¹⁹F,6n2p)对¹⁷¹Lu的1/2^－[541]转动带进行了研究,观测到了此带的第一带交叉频率.与相邻偶偶核相比该频率值推迟了约40keV.推转壳模型对单准质子的顺排角动量和能量的计算结果表明πh_9/2[541]1/2^－轨道的形变驱动作用对这种推迟的贡献是不应被忽略的.     

奇奇核170Ta高自旋态及旋称反转研究

用97MeV的¹⁹F束通过¹⁵⁵Gd(¹⁹F,4n)¹⁷⁰Ta反应布居了奇奇核¹⁷⁰Ta的高自旋态,将¹⁷⁰Ta的3个转动带推向了更高的自旋态,并观测到了半退耦带的旋称反转点,将其自旋值定在了19.5h.首次比较系统地总结了稀土区半退耦带的旋称反转系统规律,并比较了该核区半退耦带与晕带的系统性差异,特别是这两个带在能量劈裂程度上存在着系统性差异.从这一现象出发,探讨了半退耦带与晕带旋称反转系统性差异的成因,指出p-n剩余相互作用在这一现象中起着非常重要的作用.     

市场海产品铅含量分析以及小鼠对铅的吸收研究

用电感耦合等离子体质谱（ICP -MS）测量了深圳市市场上销售的花甲、生蚝、鲍鱼等16种海产品,分析了铅含量以及同位素比,其中响螺、青口贝、生蚝的铅质量分数最高,分别为（1．52±0．21）,（1．66±0．23）,（1．16±0．15）μg/g 干质量,超标,其它小于1．00μg/g 干质量,同位素比207 Pb/206 Pb 为0．76～0．89之间。将花甲,鲍鱼,生蚝,喂食昆明小白鼠（每组5只,质量35～38 g）,喂食前后（24 h）眼球取血0．030 mL 左右对比分析海鲜中铅进入血液的量,结果表明,生蚝喂食后铅有明显的上升,其中孕鼠生物有效性显著大于对照鼠。通过用水合醋酸铅加入鼠粮中喂食哺育期间母鼠,而被哺乳的新生小鼠血铅含量和母鼠喂食铅成正比,最后一组小鼠血液铅达到（1．95±0．35）μg/g,该组一直喂养2个月（8周）后小鼠个体体质量（15±4 g）与对照（26±5 g）相比显著小。实验表明高含量铅的海产品对孕妇以及哺乳期间母亲和婴儿更为危险。     

A～100区πg9/2⊙υh11/2组态带旋称反转系统学研究

对Ag, Rh和Tc同位素奇奇核πg_9/2⊙υh_11/2组态带的旋称反转进行了系统学研究, 发现旋称反转点随中子数增加而减小, 但随质子数增加而增大. 用p-n剩余相互作用与Coriolis力相互竞争的观点较好解释了A～100区旋称反转系统学规律.     

Measurement of the ~2H(~7Be,~6Li)~3He reaction rate and its contribution to the primordial lithium abundance

In the standard Big Bang nucleosynthesis(SBBN) model, the lithium puzzle has attracted intense interest over the past few decades, but still has not been solved. Conventionally, the approach is to include more reactions flowing into or out of lithium, and study the potential effects of those reactions which were not previously considered.~7Be(d,~3He)~6Li is a reaction that not only produces~6Li but also destroys~7Be, which decays to~7Li, thereby affecting~7Li indirectly. Therefore, this reaction could alleviate the lithium discrepancy if its reaction rate is sufficiently high.However, there is not much information available about the~7Be(d,~3He)~6Li reaction rate. In this work, the angular distributions of the~7Be(d,~3He)~6Li reaction are measured at the center of mass energies Ecm = 4.0 Me V and 6.~7Me V with secondary~7Be beams for the first time. The excitation function of the~7Be(d,~3He)~6Li reaction is first calculated with the computer code TALYS and then normalized to the experimental data, then its reaction rate is deduced. A SBBN network calculation is performed to investigate its influence on the~6Li and~7Li abundances. The results show that the~7Be(d,~3He)~6Li reaction has a minimal effect on~6Li and~7Li because of its small reaction rate. Therefore,the~7Be(d,~3He)~6Li reaction is ruled out by this experiment as a means of alleviating the lithium discrepancy.