~(145)Er的β延发质子衰变性质研究

通过92Mo(58Ni,2p3n)熔合蒸发反应生成了非常缺中子核145Er。利用氦喷嘴带传输系统把研究目标核传输到低本底测量站,进行了质子-γ符合测量,得到了不受同量异位素干扰的145Er的β延发质子谱。经过仔细分析与延发质子符合的γ谱,发现了145Er的11/2-同核异能态具有β延发质子衰变性质。经拟合退激144Dy不同激发态γ跃迁的衰变曲线,得出145Er的1/2+基态和11/2-同核异能态的半衰期分别为(1.6±0.6)和(0.6±0.1)s。最后,简单介绍了中重质量区缺中子新核素的合成及衰变研究计划。     

Alpha Decay of the Neutron-deficient Isotopes 215,216U

The most neutron-deficient isotopes 215;216U were produced in the complete-fusion reaction 180W(40Ar, 4-5n)215,216U. Evaporation residues recoiled from the target were separated in-flight from the primary beam by the gas-filled recoil separator SHANS and subsequently identified on the basis of correlated -decay chains. Two -decaying states were identified in 216U, one for the ground state and the other for the isomeric state with 8+(h9=2f7=2) configuration. The -decay properties for 215;216U and the systematics of 8+ isomeric state in N =124,126 isotones were investigated.     

丰中子核63,65,67Mn的在束γ谱学研究

利用放射性束68Fe轰击液氢靶引起的敲出反应，研究了极端丰中子核63,65,67Mn的激发态，指认了它们的自旋宇称，建立了这三个原子核的能级纲图。纲图包含11/2–、9/2–和 7/2– 三个激发态以及$5/2_{\rm{g.s.}}^{-}$基态，它们由三条$\Delta I \!=\! 1$的$\gamma$跃迁连接。这种能级结构与$K \!=\! 5/2$时强耦合转动带的特征一致。使用改进的LNPS有效相互作用(LNPSm)的大规模壳模型计算能很好地重现观测到的能级。计算表明，65,67Mn的低位激发态都主要包含处于$4p{\text -}4h$的中子组态和$1p{\text -}1h$的质子组态。基于实验结果发现，在吸积中子星壳中，与质量数$A \!=\! 63$相关的Urca中微子冷却效果比预期的要强很多，而$A \!=\! 65, 67$的冷却效果比预期的更弱。     

解释“蜃景”模型的实验探究

用全反射解释"蜃景"是错误的;可以用"棱镜"、"凸透镜"模型解释,用模拟实验探究可以得到相同的结论."马路蜃景"的产生是完全不同于一般所谓的"海市蜃楼"的.沙漠里有时出现的蜃景,是真正的"海市蜃楼",亦可能是"马路蜃景"与"海市蜃楼"同时发生.     

Properties of the β-delayed proton decay of 146Ho

The proton-rich isotope 146Ho was produced via the fusion-evaporation reaction ^92Mo （^58Ni, 3p1n）. The β-delayed proton decay of 146Ho was studied by proton-γ coincidence measurements using a He-jet tape transport system. The γ-transitions in ^145Tb following the proton emissions were observed, and the β-delayed proton branching ratios to the final states in the grand-daughter nucleus ^145Tb were determined. According to the relative branching ratios, the ground-state spin of 146Ho has been proposed and the possible configuration discussed.     

Properties of the ν7/2-[503]（f7/2） band in 185Pt

High-spin states in ¹⁸⁵Pt have been reinvestigated via the reaction ¹⁷³Yb(¹⁶O, 4n) at a beam energy of 90 MeV. The previously known band based on the ν7/2^-[503](f_7/2) Nilsson orbital has been extended to higher spin states. Properties of the ν7/2^-[503](f_7/2) band have been discussed with an emphasis on the evolution of configuration while increasing the spin.     

Reinvestigation of the high spin states in ^（161）Er and enhanced E1 transitions in the N=93 isotones

High-spin states in ¹⁶¹Er have been studied experimentally using the ¹⁵⁰Nd(¹⁶O, 5n) reaction at a beam energy of 86 MeV. The relatively enhanced E1 transitions between the 5/2⁺[642] and 3/2^-[521] bands are observed in ¹⁶¹Er, and the B(E1) values are extracted experimentally. The systematics of the R(E1) values in the N=93 isotones are presented. It is found that the strength of the E1 transitions obviously exhibits angular momentum dependence, and the occurrence of the relatively enhanced E1 transitions could be attributed to octupole softness.     

Fluorescence Quenching and Binding Interaction of 10-Methylacridinium Iodide to Nucleic Acids

IntroductionInrecentyears ,luminescentprobe ,particularly ,flu orescenceprobeofnucleicacid (NA )anditsprecursor(NP)includingnucleobase ,nucleosideandnucleotidehasbecomeoneofthemostpowerfultoolsinthestudyofNA .Itiswellknownthatthereisversatileinteractionbetweennucleicacidandexogenoussubstratessuchashydrogenbond ,electrostaticaction ,stackingandvanderWaalsforceetc .,1whichbasicallybelongstothephysicalinter action .However ,thelatestprogressinthisareahasshownthatelectrontransfer (ET)processof…     

有序介孔碳负载NiCo2O4电极的制备及其超电容性能

以有序介孔碳(OMC)为载体,采用共沉淀法制备了OMC/NiCo2O4复合物.用X射线衍射(XRD)、傅里叶变换红外(FT-IR)光谱和透射电镜(TEM)研究其结构与形貌,发现NiCo2O4纳米颗粒均匀地负载在有序介孔碳上.循环伏安和恒流充放电测试表明,NiCo2O4质量分数为40%时,在1A·g-1的电流密度下,复合物电极的比电容可以达到577.0F·g-1,电流密度为8A·g-1时,比电容可以达到470.8F·g-1,并具有良好的循环稳定性.在2A·g-1的电流密度下,经过2000次循环后,比电容还可达到508.4F·g-1,电容保持率为92.7%.     

低频信号发生器在感抗、容抗实验中的应用

普通高中课程标准实验教科书《物理》选修3-2第五章第三节"电感和电容对交变电流的影响",在讲电感对频率变化的交流的影响时是这样描述的:"实验和理论分析都表明,线圈的自感系数越大、交流的频率越高,电感对交流电的阻碍作用就越大,也就是说,线圈的感抗越大."同样地,在讲电容对频率变化对交流电的影响时也是这样描述的:"理论和实验分析都表明,电容器的电容越大,交流的频率越高,电容器对交流的阻碍作用就越小,也就是说,电容器的容抗就越小."