Measurement of ~(25)Mg(~7Li,~6He)~(26)Al Angular Distribution

<正>In order to study the 58keV resonance in ~(25)Mg(p,γ)~(26)Al reaction,the measurement of the~(25)Mg(~7Li,~6 He)~(26) Al*_(6.364)reaction was carried out by using a 31.5 MeV ~7Li beam from the HI-13tandem accelerator,Beijing.The 200 enA 7Li beam impinged on ~(25)MgO,~(24)MgO and ~(12)C target,     

Determination of the Astrophysically Relevant ~6Li(n,γ)~7Li Cross Sections from the ~7Li(~6Li,~7Li)~6Li Elastic-Transfer Reaction

Angular distributions for the ~7(Li)(~6(Li),~7(Li))~6(Li) Li elastic-transfer reaction have been measured with the Q3D magnetic spectrograph at the HI-13 tandem accelerator of Beijing, China. The neutron spectroscopic factors of 7Li are derived by comparing the calculated differential cross sections, which are obtained through the distorted-wave Born approximation (DWBA) calculation, to the experimental data. And these spectroscopic factors are then used to deduce the direct capture cross sections in 6Li(n,γ)7 Li at energies of astrophysical relevance.     

Measurement of ~7Be(d,~3He)~6Li Angular Distribution

正The baryon density can be deduced from the Wilkinson microwave anisotropy probe(WMAP),and the ~6Li and ~7Li abundance can then be computed by the standard Big Bang nucleosynthesis model~([1]).Surprisingly,the primordial ~7Li abundances of astronomical observations are only     

~2H(~6He,~7Li)n反应角分布和~7Li的质子谱因子

在中国原子能科学研究院HI-13串列加速器次级束流线上,使用6He次级束首次测量了质心系能量为9.1 MeV的2H(6He,7Li)n反应角分布,并用扭曲波波恩近似(DWBA)进行理论分析,导出了7Li的质子谱因子为0.40±0.02。     

~2H和~3H标记四氢原小檗碱的制备

本文报道由相应的原小檗碱季铵盐经NaBD_4还原方便地制得三个氘代四氢原小檗碱同类物。氘代位置及产物构型经质谱、核磁共振和红外光谱得到证实。类似地还制得具有较高比放射强度和放化纯度的氘标记四氢小檗碱和千金藤立定。     

Isospin Distribution of Fragments in Reaction ~(96)Ru ~(96)Ru, ~(96)Ru ~(96)Zr,~(96)Zr ~(96)Ru,and ~(96)Zr ~(96)Zr at Beam Energy 400 AMeV

The isospin distribution of particles and fragments in collisions 96Ru 96Ru, 96Ru 96Zr, 96Zr 96Ru, and 96Zr 96Zr at beam energy 400 AMeV is studied with isospin dependent QMD model. We find the rapidity distribution of difference between neutron-proton number in neutron rich nucleus-nucleus collisions at intermediate energies is sensitive to the isospin dependent part of nuclear potential. The study of the N/Z ratio of nucleons, light charged particles (LCP) and intermediate mass fragments (IMF) shows that the isospin dependent part of nuclear potential drives IMF to be more isospin symmetric and emitted nucleons to be more neutron rich. We also study the time evolution of the isospin distribution     

Lifetime of 2~+ State in ~(106)Cd

<正>Several nuclei including ~(106)Cd in Aabout 100mass region have been predicted to exhibit E(5)critical point symmetry~([1]).However,the E(5)symmetry in ~(106)Cd is still hard to be identified.One of difficulties is that the B(E2)information,or the mean lifetime,of 2~+ state in ~(106)Cd deter-     

Investigation of production of medical ~(82)Sr and ~(68)Ge for ~(82)Sr/~(82)Rb and ~(68)Ge/~(68)Ga generators via proton accelerator

How to operate~(82)Sr/~(82)Rb and ~(68)Ge/~(68)Ga generators used in the positron emission tomography scan process is explained, and the importance of ~(82)Sr and ~(68)Ge radionuclides for these generators is revealed. To produce medical ~(82)Sr and ~(68)Ge by means of a proton accelerator in an irradiation time of 24 h, a proton beam current of250 l A, and an energy range E_(proton)= 100 →5 MeV, the cross sections and the neutron emission spectrum curves of(p,xn) reaction processes on Rb-85, Ga-69 and Ga-71 targets were calculated, and the activities and yields of the product were simulated for the reaction processes. Additionally, the integral yields of the reaction processes were determined via the calculated cross-sectional curves and the mass stopping power obtained from the X-PMSP program. Furthermore, based on the obtained results, the appropriate reaction processes for the production of ~(82)Sr and ~(68)Ge isotopes on Rb-85, Ga-69, and Ga-71 targets are discussed.     

~1H、~2H核磁共振研究氘标记丙氨酸的标记位置及相对百分含量

本文利用质子及氘的核磁共振波谱技术研究氘标记丙氨酸的标记位置及相对百分含量,并指出:~1H核磁共振利用波谱高度的下降间接证明氘被富集在分子上的结果具有不确定性,而~2H核磁共振则是直观地观察到在相对应的质子谱线位置上氘被标记的信号并可计算各标记基团之间标记百分含量。     

Measurement of One Proton Transfer Reaction ~(208)Pb(~7Li,~6He)~(209)Bi in Deep Sub-barrier Region

<正>Due to the limit of the intensity and quality of the radioactive ion beam(RIB),it is a difficult task to extract the optical model potentials(OMPs)of halo nuclear systems directly from the elastic scattering measurement.In view of this fact,the transfer reaction was tried to be used as an alternative method to extract and stud-     

Near-barrier Fusion Evaporation and Fission of ~(28)Si+~(174)Yb and ~(32)S+~(170)Er

<正>Heavy-ion induced fusion-fission reactions at energies around the Coulomb barrier have attracted much attention~([1-2]),due to many degrees of freedom involved in the interaction processes.It has been experimentally proved that the coupled interactions of some intrinsic motions and relative motion play a significant role in the process that     

Global Phenomenological Optical Model Potential for ~6Li,~7Li,~9Be,~(12)C and ~(16)O as Well as Exotic Nuclei Projectiles

<正>The optical model is one of the most fundamental theoretical models in nuclear reaction theory.The key point of the optical model is how to give the optical model potential.The global phenomenological optical model potential for~6 Li,~7 Li,~9 Be,~(12) C and~(16) O projectiles are studied by simultaneously fitting theexperimental data of the reaction cross sections and elastic scattering angular distributions in the mass range of the target nuclei 20≤A≤209at incident projectile energy below 200 MeV,     

Model-based cross section calculations on production of ~(43,34)Sc,~(45)Ti,~(51)Cr,~(54)Mn,and ~(55)Fe radioisotopes

A cross section database on excitation functions of reactions produced by charged particles is essential for many areas of nuclear research. Particularly, accurate knowledge on nuclear cross sections for the cyclotron production of radioisotopes is very important for nuclear medicine. In the present paper, the cross section calculations for the production of~(43),~(34)Sc,~(45)Ti,~(51)Cr,~(54)Mn, and~(55) Fe radioisotopes were carried out by the use of ALICE/ASH code using the Fermi gas model, Kataria Ramamurthy Fermi gas model, and superfluid nuclear model for nuclear level density. Thereby, these model calculations were compared with the available measured data.     

~7Be(d,~3He)~6Li and Its Effect on Primordial Lithium Abundance

<正>The ~6Li,~7Li abundance can be computed by the[standard Big Bang nucleosynthesis model[1].Surprisingly,the primordial ~7Li abundances of astronomical observations are only about 1/3of the model calculation,while the primordial ~6Li abundances observed by astronomical observa-     

^14C标记农药杀螟松和马拉硫磷的制备

以Ｂａ＾１４ＣＯ３为起始原料制得＾１４ＣＨ３ＯＨ，然后和＾１４ＣＨ３ＯＨ与ＰＳＣｌ３在碱性条件下反应，再加入甲基砂基苯酚，在甲基异丁酮溶剂体系下制得＾１４Ｃ－刹螟松，放化纯度〉９５％，放射性比活度为１８８．７ＢＭｑ／ｍｏｌ，＾１４ＣＨ２ＯＨ与Ｐ２Ｓ５合成的中间体，加顺丁烯酸二乙酯在甲苯溶剂体系中反应制成＾１４Ｃ－马拉硫磷，放化纯度〉９５％，放射性比活度为１５６．４ＭＢｑ／ｍｏｌ。     

~3H和~(14)C标记常咯啉的合成

本文用合成方法制备了抗心律不齐新药常咯啉的三种不同位置~3H和~(14)C的标记化合物。以5-溴邻氨基苯甲酸按Scheme 1经5步反应得6-溴代常咯啉(Ⅵ),Ⅵ用氚经催化脱卤得[6-~3H]常咯啉(Ⅰ)用[~(14)]甲酸制成[~(14)C]甲酰胺,按Scheme 1经二步反应得[2~(14)C]5-氯代喹唑啉(V,R=H)再按Sc-heme2即得[2-~(14)C]常咯啉(Ⅱ)。以[~(14)C]甲醛为原料按Schemel的最后一步可直接制得(甲撑-~(14)C)常咯啉(Ⅲ)     

Optical Potentials of Halo System ~6He+~(64)Zn

正The angular distributions of the transfer reactions of ~(63)Cu(~7Li,~6He)~(64)Zn were measured at energies around the Coulomb barrier,to extract and study the optical model potential(OMP)of halo system ~6He+~(64)Zn in the exit channel.Due to the limit of the intensity and quality of the radioactive ion beam(RIB),it is a difficult task to     

Experimental Study for Near-barrier Reaction of ~7Be+~(209) Bi

<正>The radioactive beam physics in one of the current frontiers in nuclear physics.The reaction mechanism in the exotic-beam induced reactions is a hot topic.Considering this,the experimental study for the reaction mechanism of the nearbarrier~7Be+~(209)Bi reaction based on the radioactive-beam line RIBLL1 were performed in the Institute of Modern Physics (IMP) in Lanzhou.     

Measurement of ~(59)Ni and ~(63)Ni by AMS

正The long lived isotopes ~(59)Ni and ~(63)Ni can be used in many areas such as radioactive waste management,neutron dosimetry,cosmic radiation study,and so on.Based on the large accelerator and a big Q3D magnetic spectrometer,the measurement method for ~(59)Ni and ~(63)Ni is under development at the AMS facility at China Institute     

被动累积~(222)Rn-~(222)Rn探测器

本文采用 2只扩散杯 ,一只选择渗透率较大的滤膜 ,使2 2 2 Rn和2 2 0 Rn能很容易的进入。另一只选择渗透率较小的滤膜 ,该滤膜只允许2 2 2 Rn进入 ,半衰期较短的2 2 0 Rn被阻挡在外面。通过不同滤膜扩散率的差异 ,改变探测器的空气交换率 ,从而达到同时测量2 2 2 Rn和2 2 0 Rn的目的