13MeV质子对Bi-Pb-Sr-Ca-Cu-O超导薄膜的低温辐照效应

用不同通量的13 MeV 质子束照射了 Bi-Pb-Sr-Ca-Cu-O 超导薄膜,引起了电阻率ρ、T_c、T_(offset)(超导电阻完全转变的温度)和转变宽度△T_c 的明显变化.在照射通量≤2.8 ×10~(15)H~+/cm~2下,T_c 和 △T_c 没有变化,而ρ随通量的增加而超线性地增加,在通量为1.3×10~(17)H~+/cm~2时,T_(offset)和 △T_c 发生急剧的变化,这意味着超导晶粒间的相耦合被完全破坏了.被最大照射通量2.5×10~(17)H+/cm~2照射过的薄膜经室温退火后,T_(offset)和△T_c,几乎完全恢复了,但ρ仍然没有变化.     

高电离态Ti原子EUV光谱的实验研究

在中国原子能研究院HI-13串列加速器上用束-箔技术完成了80 MeV Ti离子和C箔相互作用产生的高电离态离子谱观测,与用激光等离子体技术的实验结果做了比较，大多数谱线与激光等离子体技术的实验结果有较好的符合，有3条谱线是未观测到的.这几条谱线为ⅩⅧ 13.406，ⅩⅧ 14.987，17.439nm, 属于2s2p^{2 4}P_3/2—2p^{3 2}D_3/2, 2s2p^{2 1}S₀—2sp^{3 1}P₁, 4p ¹P₀—5d ¹P₁跃迁. 关键词： 串列加速器 高电荷态原子 激发光谱     

超短超强激光脉冲作用下的Mo等离子体X射线辐射(英文)

在SILEX-1激光器上,利用光子计数型CCD测量了超短超强激光束与高纯度Mo相互作用而产生的发射谱。实验发现, 在超短超强激光脉冲作用下, Mo等离子体辐射Kα X射线, 这一过程伴随很强的热辐射和轫致辐射。Mo等离子体Kα X射线辐射强度、 热辐射和轫致辐射随激光功率密度增加而增强。Using a Single photon counting CCD, X ray emission spectra of high purity Mo irradiated by ultra short and ultra intense laser pulse was firstly detected. The experiment was carried out with the SILEX 1 laser facility. The experimental results show that, for Mo target, characteristic K shell emission (Kα) is observed in the 0.23—2.32 J energy range in addition to a broadband bremsstrahlung background, and the X ray radiation intensity, thermal radiation and bremsstrahlung increase with enhancementofthe laser power density.     

高电离态Ti原子光谱的测量

在加速器上利用束箔光谱方法，测量了Ti离子的高电离态光谱。     

Measurement of ^16O^5＋ Induced L X-Ray Production Cross Sections for Gold

The characteristic L1, Lα, Lβ and Lγ x-rays of Au and energy shifts produced by 20-50 MeV ^16O^5＋ beams on a thick Au film are measured with a Si （Li） detector. Cross-section ratios of σ（Ll）/σ（Lα）, σ（Lβ）/σ（Lβ） and σ（Lγ）/σ（Lα） versus O^5＋ energy show that consistent calculations yield considerably better agreements. Energy shifts L1, Lα, Lβ and Lγ x-rays of Au target increase with more incidence energy. The main application for these measurements is multi-element trace analysis through particle induced x-ray emission.     

Study of n=2,Δn=0 transition of Be-, B-, C-, N- and O-like sequence in the beam--foil spectrum of titanium

The foil-excited the spectrum of highly stripped titanium ions between 12-40 nm has been studied. Titanium ions of 80 and 120 MeV were provided by the HI-13 tandem accelerator at the China Institute of Atomic Energy. GIM-957 XUV-VUV monochromator was refocused to get highly-resolved spectra. Our experimental results and the published spectral data of laser-produced plasma show agreement in nearly all cases within ±0.03 nm. The spectra contained some weak or strong lines previously unclassified. These spectral lines mainly belong to 2s2p^2 for TiXVⅢ, 2p^3 for TiXVIII, 2s2p^3 for TiXVII, 2p^6 4p for Ti XII and 2p^6 3d for Ti XII transitions.     

碳离子碰撞引起的金L壳层X射线产生截面的实验研究

实验测量了20～50 MeV的C离子和Au原子碰撞中Au产生的L壳层X射线,研究了Au的L各支壳层产生截面σ(L_l)、(L_α)、(L_β)、(L_γ)和总截面的比值σ(L_(total)与入射离子能量的关系.利用L壳层的辐射跃迁几率,Croster～Kroning跃迁率和L亚壳层的荧光产额将平面波波恩近似(PWBA)和ECSSR理论计算的电离截面转换为L层X射线产生截面,并与实验结果相比较,结果表明σ(L_l)、(L_α)、(L_γ)和总截面σ(L_(total))实验测量值随入射离子的变化趋与ECPSSR和PWBA所预测的结果一致,ECSSR理论值更接近我们的实测测量值,但是数值大于实验测量结果.     

离化态氧原子的激发光谱的研究

在串列加速器上利用束箔-方法和带有CCD的光谱仪测量装置,在2～2.5 MeV束能下采用Spectrapro-500i光谱单色仪,在200 nm～800 nm波长范围测量了离化态氧原子的500多条光谱线.实验发现了许多弱谱线的跃迁能级,这些跃迁谱线以前带有光电倍增管或电子倍增器的单色仪很少测量到这些弱谱线的跃迁.本文报道在200nm～300nm范围已确定的部分光谱线和跃迁能级,这些跃迁主要属于OⅡ到OⅣ离化态原子的3p 4S3/2,3p 2 S1/2,3p 4P1/2,3p 4P3/2,3p 4P 5/2,3p 2D3/2,3p 2D5/2,3d 2D5/2,3d 2F5/2,3d2F7/2,4p 3D1,4p 3D2,5d 2D5/2等能级的跃迁,光谱分辨0.015 nm.