Production of ^10c Secondary Beam

理论上存在着两种矛盾的预言，即通过碰撞核相对运动与破裂道的耦合使全熔合截面压低或增强。最近，Hagino作了一改进的耦合道模型计算，试图调和两种相冲突的处理。他的理论处理预言结果，在库仑位垒以下能区破裂使全熔合截面增强，而在垒上能区，破裂使全熔合截面压低。不同的理论预言，需要精确可靠的实验作判断。     

Production of ^13N Secondary Beam

Explosive hydrogen burning occurs in very massive （M≥ 10^5-10^8M） star with high temperature and density. Hot pp chain, hot CNO, hot NeNa-MgAl chain and the flowing rp ap process will play a prominent role in hydrogen burning as the temperature goes higher. When the temperature of the star is higher than 10^8 K, high temperature CNO chain is dominant in hydrogen burning,     

22Na次级束的产生与应用

在日本东京大学核研究中心的放射性离子束分离器上,利用逆运动学反应¹H(²²Ne,²²Na)n产生了²²Na次级束。经分离器电磁系统的分离提纯后,获得了能量为（78.3±1.0） MeV的²²Na次级束。实验靶站处次级束的强度达2.5×10⁵ s^-1,其中²²Na的纯度好于90%。²²Na次级束已应用于与核天体物理Ne丰度异常问题相关的²²Na+α共振散射实验研究。     

13N次级束的产生

在北京串列加速器次级束流线上通过²H(¹²C,¹³N)n反应产生了可用于核天体物理研究的¹³N次级束。经磁刚度选择以及速度选择，准直后的次级束纯度达91%，能量为(70.2±0.7)MeV，强度约为10s^-1•pnA^－1，可用来进行逆几何转移反应的实验测量。     

8Li次级束的产生

在北京串列加速器次级束流线上通过2 H(7Li,8Li) 1H逆运动学反应产生了用于核天体物理研究的8Li次级束。准直后的次级束纯度达到 80 %以上 ,对于 44MeV的7Li强度约为 3 0s- 1·pnA- 1,可以用来进行逆几何转移反应的实验测量。     

10C次级束的产生

在中国原子能科学研究院HI-13串列加速器次级束流线上通过¹H(¹⁰B，¹⁰C)n反应产生了能量为(55.9±0.9)MeV的¹⁰C放射性次级束。经过磁刚度和速度选择，准直后的¹⁰C束流纯度达到90%以上，强度约为6s^-1•pnA^-1。     

Production of ~8Li Secondary Nuclear Beam

8Liisatypicalneutron-skinnucleuswithahalf-lifeof838msandaneutronseparatioenergyof2.033MeV.Usinga8Libeam,onecanstudythereactionsrelevanttonuclearhalostructure,aswellastheimportantprimordialastrophysicsreactionssuchasd(8Li,9Li)p.Tomakethosemeasurementsfeasi…     

15O次级束的产生

在北京HI13串列加速器次级束流线上利用2H(14N,15O)n逆运动学反应产生了15O次级束。经准直后,在焦平面位置处的15O次级束的能量为(74.3±0.7)MeV,纯度可达50%,强度约为80pnA-1·s-1。利用15O次级束可实现对核天体物理高温CNO循环及其泄漏过程中若干关键反应的逆运动学实验测量。     

150次级束的产生

在北京HI-13串列加速器次级束流线上利用2H(14N,15O*)n逆运动学反应产生了15O次级束.经准直后,在焦平面位置处的15O次级束的能量为(74.3±0.7)MeV,纯度可达50%,强度约为80 pnA-1·s-1.利用15O次级束可实现对核天体物理高温CNO循环及其泄漏过程中若干关键反应的逆运动学实验测量.     

Production of 7Be, 22Na, 24Na and 10Be from Al in a 4π-irradiated meteorite model

A model of a small meteorite, 10 cm in diameter, made of granodiorite was rotated in a beam of 600 MeV protons to simulate 4π-irradiation conditions in space. Analysis of Al foils placed at known locations within the model give depth profiles of high energy (⁷Be, ¹⁰Be) and low energy (²⁴Na, ²²Na) spallation products. These isotopes were measured by means of high-resolution gamma-ray or accelerator mass spectroscopy (AMS). While the production rate profiles of the high energy products are flat within the limits of uncertainty, the profiles of the low energy products increase from the surface to the center by a factor of approximately 1.2. This increase indicates the importance of secondary neutrons and protons for the production of low energy spallation products, even within small meteorites.     

用加速器制备~(22)Na

一、前言~(22)Na是钠的寿命最长的放射性同位素(T_(1/2)=5.6y)。在刻度仪器、生物化学和医学等方面都有广泛的用途。~(22)Na可以通过反应堆和回旋加速器制备,并且可以获得高纯度~(22)Na。由于它发射高能正电子和γ射线,用4πβ-γ符合计数器或高压正比计数器可对它的衰变率进行准确测量。     

Isotopes Development of ^124Xe Gas Target System for ^123I Production by Cyclone-30

Same as the main preparation method for high purity of ^123I in other countries, we would use also 99.9% of ^124Xe gas via ^124Xe（p, x） reaction and ^123Xe decay to get the objective product ^123I.     

Study of Astrophysical Nuclear Reactionon Beijing Secondary Beam Line GIRAFFE

The11C(p,γ)12Nreactionisoneofthekeyprocessesinhotppchains.Thisreactionmayberesponsiblefortheproductionof12Cincertainastrophysicalscenarios.Thereactionrateresultsfromthecontributionsofthe1.19MeVresonanceandthedirectcaputureintheGamowenergywindowcorrespond…     

Low-Background Measurements of 22Na in Natural Waters of Krasnodar Krai

Gamma spectrometers with 100 × 100 mm NaI(Tl) and 200 × 100 mm CsI(Tl) crystals for detecting annihilation radiation of ⁺ radionuclides are described. Two spectrometers are located in a surface laboratory and one underground, at a depth of 500 m of water equivalent, in Novorossiisk. The background characteristics and the detection efficiency are presented for different operating modes of the coincidence system and for samples with different mass. A coincidence scheme in which all events with coincidences of pulses in both crystals and energy released in each detector are detected, making it possible to raise the ²²Na detection efficiency by approximately 30%, was tested. The results of measurements of the ²²Na content in some natural waters in Krasnodar krai, including in mud volcanoes, are presented. They show large seasonal variations.