790 MeV 136Xe轰击56Fe靶时产生的丰中子同位素54Ti,56V,57V,58Cr

用790MeV¹³⁶Xe轰击⁵⁶Fe靶,测量了类靶碎片的质量数和原子序数。探测且鉴定了四个丰中子同位素⁵⁴Ti,⁵⁶V,⁵⁷V,⁵⁸Cr。同时提供了⁵⁵Ti,⁵⁸V,⁵⁹Cr存在的可能性。使用西德重离子研究中心的磁谱仪和磁分析一起进行了飞行时间和ΔE-E测量,同位素鉴定是可靠的。     

THE CROSS-SECTION MEASUREMENTS FOR 59Co(n,p)59Fe,59Co(n,α)56Mn AND 59Co(n,2n)58Co REACTIONS

The cross sections of ⁵⁹Co(n,p)⁵⁹Fe,⁵⁹Co(n,α)⁵⁶Mn AND ⁵⁹Co(n,2n)⁵⁸Co reactions have been measured at neutron energy region of 12.8MeV—17.8MeV by activation method.The coveriance matrix of measured errors was calculated,and the comparison between the values of measured and calculated using theory model was made.The evaluated excitation functions for the three reactions are given.     

16O+24Mg和20Ne+24Mg弹性散射的机制

本文考虑了两碰撞核间核子结团的转移机制, 解释了象¹⁶O+²⁴Mg和²⁰Ne+²⁴Mg这样一些4N核间的弹性散射微分截面后角振荡上升的反常现象. 在原子核分子轨道模型的理论框架下, 将交换势的强度作为唯一的可调参数, 数值计算较自然地拟合实验结果.     

Level Schemes in Neutron-Rich 141Xe、152Ce、153Nd and 160Sm Nuclei

The level schemes of neutron-rich nuclei,¹⁴¹Xe、¹⁵²Ce、¹⁵³Nd and ¹⁶⁰Sm have been established for the first time through measuring the prompt γ-rays from spontaneous fission of ²⁵²Cf.The highest spin state is up to 16⁺.The collective band structures in these neutron-rich nuclei are discussed.     

12C+27Al,12C+209Bi和14N+Pb反应全熔合截面测量

本文叙述了用云母径迹探测器分别探测复合核蒸发余核和裂变碎片的实验,从而测出了¹²C+²⁷Al,¹²C+²⁰⁹Bi和¹⁴N+Pb反应的全熔合截面和激发函数.并用锐截止模型由全熔合截面导出了临界角动量.实验结果和当前有关的理论计算进行了比较,在实验误差范围内基本相符.     

16O(16O, 12C)20Ne α转移反应机制的研究

¹⁶O(¹⁶O, ¹²C)²⁰Ne反应微分截面中的振荡结构在核分子轨道理论框架下, 基于由共价道到离子道的α转移机制得到满意的解释.     

重离子引起的单质子转移反应40Ar(11B, 10Be)41K

测量了50MeV的¹¹B束在40Ar上的弹性散射角分布和单质子转移反应⁴⁰Ar(¹¹B, ¹⁰Be)⁴¹K的微分截面. 用光学模型拟合了弹性散射截面. 用包含反冲效应的精确有限程扭曲波玻恩近似(EFR-DWBA)分析了微分截面, 提取了谱因子.     

(EC/β+) Decay of 130Nd and 140Tb

Isotopes,¹³⁰Nd and ¹⁴⁰Tb were produced using enriched targets ⁹⁶Ru and ¹⁰⁶Cd, respectively,bombarded by ³⁶Ar ion beam. The two nuclides were identified and studied by a He-jet tape transport system in combination with "X-γ" and "γ-γ" coincidence measure- ments. The half-life of ¹³⁰Nd was determined to be (13±2)s. The EC/β⁺ decay scheme of 130Nd was proposed for the first time, and the spins and parties of the ground-state and observed low-lying states in the daughter nucleus ¹³⁰Pr were speculated tentatively. The previous simple EC/β⁺ decay scheme of ¹⁴⁰Tb was revised, and the spin-parity of its groundstate was assigned to be 7⁺.     

56MeV—70MeV12C+28Si弹性散射研究

用大面积位置灵敏电离室测量了69.5MeV, 66MeV, 59MeV和56MeV轰击能量下¹²C+²⁸Si弹性散射角分布. 用光学模型对实验数据进行了拟合, 并讨论了弹性散角分布振荡及增强的可能原因.     

12C+12C核分子共振

本文利用核分子振转模型, 解释了¹²C+¹²C反应系统的中间结构现象.     

156Er和158Er的带二

用VMI方法分析了¹⁵⁶Er和¹⁵⁸Er带二的成因.     

π－核双电荷交换反应核谱因子和26Mg(π+, π－)26Si反应

π^－核双电荷交换反应的强度与反应过程的两核子转移的核谱振幅直接联系着. 本文讨论了这类反应与它们的核谱因子的关系. 并以²⁶Mg(π⁺, π^－)²⁶Si为例, 用两种核结构讨论了它的激发函数和微分截面. 我们所用的理论方法能够解释实验数据.     

12C+27Al,40Ca耗散碰撞的扩散模型分析

在扩散模型的框架内, 用假定中间组合系统以一个统计的寿命衰变的方法分析了68MeV¹²C+²⁷Al和68.6MeV¹²C+⁴⁰Ca的耗散碰撞中产生的产物的三重微分截面d²σ/dZdEdθ的一般趋向. 导出了中间组合系统的半衰期及产生全阻尼深部非弹性产物的平均互作用半径. 简单地对计算的角分布及Wilczynski图与实验测量结果进行了比较, 讨论了产生二者之间的差异的可能原因.     

(EC+β+) Decay of 130Pm and 128Pr

¹³⁰Pm and ¹²⁸ Pr were produced by irradiation of ⁹⁶Ru with 171MeV ³⁶Ar beam,and a He-jet recoil tape transport system transported radioactivities to shielded reigon. Based on X-γ-t and γ-γ-t coincidence measurements ,the (EC+β⁺)decay scheme of ¹³⁰Pm was proposed for the first time and the (EC+β⁺)decay scheme of ¹²⁸Pr was revised.     

14N+58Ni和14N+64Ni深部非弹性反应产物同位素分布的差异

实验测得¹⁴N(93兆电子伏)+⁵⁸Ni、⁶⁴Ni深部非弹性反应产物同位素分布, 发现这两者存在系统性的差异.     

The Study of α Emission Induced by 46.7MeV/u 12C on 58Ni、115In and 197Au

The energy spectra and angular distribution of α particles emitted from ¹²C induced reactions with ⁵⁸Ni,¹¹⁵In and ¹⁹⁷Au have been measured.Three moving sources of emitting α particle are clearly seen from invariant cross section distribution in velocity coordinates.The experimental data were analyzed by using three moving sources.Extracted parameters of the source with half-beam velocity are in agreement with the systematic values from Fermi Gas Model.The energy spectra and the extracted parameters for various targets are discussed.The low energy peak in energy spectra is possibly from the emitted α particle from equilibrium system after pre-equilibrium emission of target-like products.The energetic α particles are mainly from projectile fragmentation and projectile-like fragmentation.     

156Er和162Er的转排角动量

使用VMI模型计算¹⁵⁶Er和¹⁶²Er的转排角动量时, 发现一对核子拆对、转排时两核有不同性质的形状跃迁.     

12C+27Al深部非弹性散射研究

用△E-E 计数器望远镜鉴别反应产物,研究71.5兆电子伏的¹²C 离子在²⁷Al 靶子上的深部非弹性散射,得到了产物 B 和 Be 在质心系 E-θ平面的截面等高线图。由图可以看出准弹性散射和深部非弹性散射的一般特征。有两点值得特别指出:第一,从淮弹性峰到深部非弹性散射岭呈现某些精细结构.第二,完全阻尼部份的平均动能不等于终态库伦能.     

关于162,164Er,164,166Yb,168Hf诸核的回弯机制

通过对相邻奇A核转动带的回弯行为的分析,无法肯定^162,164Er,^164,166Yb,¹⁶⁸Hf诸核的回弯机制。本文利用HFB推转模型,计算了这些核的排列角动量i（ω）和回弯的临界角频率ω_c,探讨了阻塞效应的影响,通过和实验值的比较,确定了它们出现回弯均是由于一对i_13/2中子转动排列的结果。     

Complex Fragments Emitted in Reactions of 46．7MeV/u 12C on 197Au,115In and 58Ni

Energy spectra of complex fragments emitted in the reactions of 46.7MeV/u ¹²C with different targets ¹⁹⁷Au,¹¹⁵In and ⁵⁸Ni have been measured by telescopes,consisting of a gis ionization counter followed by a position Sensitive semiconductor detector.Tha most probable kinematical energies.E_p of complex fragments and temperature parameters of long－live intermediate systems have been deduced by complex fragment ernergy spectra.The experimental values of E_p are lower than the calculated ones by E=V_coul+2T.The experimental values of complex fragment yields can be reproduced by simple A.Friedman statistical evaporation model satisfactorily.