N,N—二甲基苯胺^1H核磁共振溶剂效应的研究

本文研究了Ｎ，Ｎ－二甲基苯胺分子在环已烷和苯混合溶剂中的＾１ＨＮＲＭ谱的溶剂效应，观察到Ｎ，Ｎ－二甲基苯胺分子内的两个甲基和混合溶剂的苯－环已烷的化学位移随苯的摩尔分数增加而逐渐移向高场，ＡＳＩＳ值随苯的摩尔分数增加而增加。得到了所有化学位移植和ＡＳＩＳ值与苯的摩尔分数呈线性关系，尝试用溶剂化作用解释了苯对Ｎ，Ｎ－二甲基苯胺的ＡＳＩＳ效应。     

Structures of ^17F and ^17O, ^17Ne and ^17N in the Ground State and the First Excited State

The structures of two couples of mirror nuclei ^17F and ^17O, ^17Ne and ^17N in the ground state and in the first excited state are investigated using the relativistic mean-field approach. Two-proton halo in ^17Ne in the first excited state and in the ground state and two-neutron halo in ^17N in the first excited state are suggested.Meanwhile, one-proton halo in ^17F in the first excited state and one-neutron halo in ^17O in the first excited state are also suggested. The skin structure appears in ^17F and ^17N in the ground state.     

Iosotopic Distributions of the ^18N Fragmentation Products in Coincidence with Neutrons on Targets ^197Au and ^9Be

We present the experimental isotopic distributions of the ^18N projectile fragmentation products Li,Be,B and C in coincidence with neutrons,as well as the inclusive ones on ^197Au and ^9Be targets.In the framework of the abrasion-ablation model,these distributions are calculated for various nucleon density distributions of the projectile.The comparison with experimental isotopic distributions of the projectile-like fragments in coincidence with neutrons shows that the information on the nucleon density distribution of the ^18N projectile can be extracted.     

Theoretical Investigation of the Exotic Structure of the Mirror Nuclei ^17Ne and ^17N

The exotic structures of the ground state of the mirror nuclei ^17Ne and ^17N are investigated by means of the asymptotic normalization coefficient （ANC） method to explore the role of the Coulomb interaction, The probebilities of a valence nucleon outside the binding-potential are P = 56.69±2.98/7.46% for ^17Ne and P = 45.51±2.32/5.81% for ^17N. The rms radii are （r^2）^1/2 = 5.06±0.11/0.30 fm and （r^2）^1/2=4.24±0.06/0.16 fm, respectively. The results obtained are nearly independent of the potential parameters. According to the halo occurrence conditions, it is suggested that ^17Ne is a two-proton halo and ^17N is a two-neutron skin. Moreover, two effects of the Coulomb interact-ion on the exotic structure are analysed. From the present results, the exotic structure of the nucleus in the proton-rich side is more obvious than that of its mirror nucleus because of the Coulomb interaction.     

Astrophysical Rates for ^12N（p,γ）^13O Direct Capture Reaction

The proton capture on the unstable nuclei plays a very important role in nucleonsynthesis. The ^12N（p,γ）^13O reaction rates at the energies of astrophysical interest are estimated with the spectroscopic factor and asymptotic normalization coeffcient methods. The present results show that the ^12N（p,γ）^13Oreaction may play an important role in x-ray bursts.     

中高能电子和N2（^1Σ^＋g）,CO（^1Σ^＋）弹性散射全截面的计算

此文采用由原子轨道线性组合构成的自洽场分子轨道，用一级玻恩近似计算了能量为１００－５０００ｅＶ的电子与Ｎ２（＾１Σ＾＋ｇ、ＣＯ（＾１Σ＾＋）弹性散射的微分截面和全截面。由于采用Ｇａｕｓｓ函数的线性组合拟合Ｓｌａｔｅｒ函数的方法，得到了弹性散射微分截面的解析表达式，使计算大大简化，计算得到的电子和Ｎ２，ＣＯ散射的总截面和实验结果进行了比较，当入射电子的能量大于１ｋｅＶ时，理论值和实验值之间符合得很好     

Fusion Reaction of ^16O＋^14N and Its Implication for the Production of ^26Al in Explosive Oxygen Burning

We suggest that the fusion reaction ^16O＋^14N may be a new way to produce ^26Al in interstellar medium. Adopting different mixing modes, we investigate the impact on the production of ^26Al in explosive oxygen burning and find that the result is extremely sensitive to mixing mechanisms. In some cases, we obtain an encouraging result, for example, the greatest final abundance of ^26Al reaches 7.779×10^-6, which means that the explosive oxygen burning may be a new origin of ^26 Al.     

取代亚胺中亚胺基^15N NMR化学位移规律的研究

提出了计算苯甲醛亚胺、N-苯基亚胺、N-甲基亚胺、N-异丙基亚胺中亚胺基氮原子15N NMR化学位移的经验公式:δcal=δ0n Δα Δβ Δγ c.按亚胺基氮原子和碳原子上两类取代基的不同分别结合最小二乘法通过线性回归各得到5种取代基参数,计算结果分别以其化学位移数据为样本点作回归检验,置信度为99.5%,最大误差Δδ≤3.1,大约有95%的15N NMR化学位移计算值的计算误差小于3.0(相对误差小于0.3%).初步分析了芳香族亚胺苯环上对位取代基对亚胺基氮原子化学位移的影响.     

Determination of Astrophysical 13N（p,γ）^14O S-factors from the Asymptotic Normalization Coefficient of ^14C→^13C ＋ n

The angular distribution of the ^13C（d,p）^14C reaction is reanalysed using the Johnson-Soper approach. The squared asymptotic normalization coefficient （ANC） of virtual decay ^14 C →^13 C^14＋ n is then derived to be 21.4±5.0 fm^-1. The squared ANC and spectroscopic factor （SF） of ^14O→^13N ＋p are extracted to be 30.4± 7.1 fm^-1 and 1.94 ± 0.45, respectively. The astrophysical S-factors and reaction rates of ^13N（p, γ）140 are determined from the ANC of ^14O → ^13N ＋ P using the R-matrix approach.     

稳定团族离子B6N5^2的产生和结构

用脉冲激光气化氮化硼固体样品，并由飞行时间质谱测量，首次发一同Ｂ６Ｎ５＾＋的质谱峰强度明显高于其它团簇离子，是一种稳定的团簇离子。本文也报导了用ａｂｉｎｉｔｉｏ方法计算Ｂ６Ｎ５＾＋的几种稳定结构。     

N2O^＋离子A^2Σ^＋电子态的光谱研究

用一束波长为360．55nm的激光，通过N2O分子的(3 1)共振增强多光子电离过程制备纯净的母体离子N2O^ X^2Π3/2,1/2(000)．用另一束可调谐激光将N2O^ 离子激发至预解离态A^2Σ^ ，利用飞行时间质谱检测解离碎片NO^ 离子强度随光解光波长的变化，在278—328nm波长范围内获得了光解碎片的激发(PHOFEX)谱．观测到了N2O^ 离子A^2Σ^ ←X^2Π电子跃迁较丰富的振动谱带．通过对PHOFEX光谱的标识，获得了A^2Σ^态较准确和全面的分子光谱常数．     

He（2^3S）与N2O（X）Penning电离中的N2O^＋（A^2Σ^＋）生成速率及相…

在分子束条件下测量了Ｈｅ（２＾３Ｓ）＋Ｎ２Ｏ（Ｘ）→Ｎ２Ｏ＾＋（Ａ＾２Σ＾＋）＋Ｈｅ（＾１Ｓｏ）＋ｅ＾－反应的Ｐｅｎｎｉｎｇ电离光学光谱，求得了Ｎ２Ｏ＾＋（Ａ＾２Σ＾＋）态的初生态相对振动布居。以Ｈｅ（２＾３Ｓ）＋Ｎ２（Ｘ）→Ｎ＾＋２（Ｂ＾２Σ＾＋ｕ）＋Ｈｅ（＾１Ｓｏ）＋ｅ＾－为参考反应，测量了Ｈｅ（２＾３Ｓ）＋ＢＮ２Ｏ＾＋（Ａ＾２Σ＾＋）＋Ｈｅ（＾１Ｓｏ）＋ｅ＾－反应的速率常数ＫＮ２Ｏ＾＋（Ａ）     

N—甲基异靛蓝在不同溶剂中的^1H—NMR研究

用选择照射方法研究了N-甲基异靛蓝(isoindigatin)在(CD_3)_2CO、CDCl_3、DMSO-d_6溶剂中及重水交换后的~1H NMR谱。得到了化学环境极为类似的两芳环质子在不同溶剂中的NMR谱线归属和偶合常数。     

Analysis of Neutron Double-Differential Cross Section of n＋^14N at 14.2 MeV

Abstract By using a new reaction model for light nuclei, the double-differential cross section of n ^14N reactions at En=14.2 MeV has been analyzed. In the case of n ^14N reactions, the reaction mechanism is very complex, there are over one hundred opened partial reaction channels even at incident energy En=14.2 MeV. In this paper the opened reaction channels are listed in detail. With LUNF code the model calculation is performed to analyze the doubledifferential cross sections of total outgoing neutron. The calculated results agree fairly with the experimental data. The results indicate that the pre-equilibrium mechanism dominates the whole reaction processes, and the recoil egect in light nuclear reactions is essentially important. 5He emission has been considered, but it is only a small contribution to thedouble-differential cross section at incident energy En=14.2 MeV.