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1.
改进Al单晶样品的处理方法,得到了高质量的样品。进行了Al单晶辐照损伤实验,直接测量了E_p=1565keV时~(27)Al(p,α)~(24)Mg共振所形成的~(28)Si13.095MeV激发态能级寿命。采用Monte Carlo模拟和“分析”方法计算得到其寿命值τ=16.3±2.4as,对应的能级宽度Γ=40±6eV,与文献报道的共振产额法结果符合得较好。  相似文献   

2.
在50—90MeV的能量范围内,以1.0MeV为能量步长,测量了16O+28Si的全熔合激发函数.用熔合模型分析了激发涵灵敏,提取了模型参数在质心系能量小于46MeV时,激发函数存在粗结构,其峰位分别在34.5、38.5和43MeV.能量在46MeV以上时,结构逐渐消失.  相似文献   

3.
安竹 《中国物理 C》1995,19(10):873-878
通过22MeV质子与28Si的散射实验,测量了质子弹性散射和在21+(1.78MeV)及41+(4.62MeV)激发态上的非弹性散射微分截面.采用动量空间DWBA理论,利用由电子散射实验得到的核结构信息,和低能区的密度依赖、能量依赖的复数有效相互作用对数据进行了分析.在没有任何可调参数和归一因子的情况下,理论计算与实验数据的符合情况是令人满意的.  相似文献   

4.
用γ射线单谱测量和γ–γ–t符合测量研究了83Sr(β++EC)83Rb衰变,将83Sr衰变的γ跃迁由102条扩展到196条,发现了83Rb的19条新能级,否定了前人测得的8条能级.测定了83Sr(β+EC)衰变的分支比,重新确定了83Rb各能级的自旋和宇称值.  相似文献   

5.
通过束流能量为73MeV的116Sn(16O,2p4n)126Ba反应布居126Ba的高自旋态,利用多普勒移动衰减法测量了转晕带回弯区的能级寿命,相应的归一化B(E2)值在10+和12+态明显降低.实验结果与粒子一转子模型的理论预言作了比较. 实验B(E2)值低于理论值.  相似文献   

6.
质子滴线核12N在28Si靶上的核反应总截面测量   总被引:1,自引:0,他引:1       下载免费PDF全文
描述了50.4MeV/u的12N和42.3MeV/u的13N次级放射性束在28Si靶上引起的核反应总截面σr实验研究,结果发现12N的反应总截面σr比其相邻同位素核13N有着异常的增大.这可能是核形变及核子对效应造成的,试验中的测量误差也不可忽视.利用微观Glauber模型计算了12N在28Si靶上的核反应总截面,并与实验结果做了比较,发现理论计算与实验结果拟合较好 关键词: 质子晕 反应截面  相似文献   

7.
用低本底反康谱仪(HpGe–NaI)和HpGe–HpGe的三参数符合γ–γ–T系统,对72Ga的衰变γ单谱、符合谱进行了研究,实验共获得2.3×107个符合事件.根据实验结果建立了含有26个能级、87条γ射线的72Ga的衰变能级纲图,其中包含首次测到7条γ射线225.92、826.97、1349.71、1475.32、1667.91、2105.28、2247.39keV和4个能级3248.01、3396.27、3806.10、3864.56keVS并为2939.83keV能级和112.59、937.97、2402.25、2939.95keV4条γ射线的存在提供了证据;实验没有发现113.5、1155.7、1192.4keVγ射线和能级3307.1keV存在的证据。并把317.72keVγ射线的跃迁,由原来的能级3757.26keV跃迁到3439.51keV能级,改为3565.85keV到3248.01keV能级跃迁.  相似文献   

8.
原子核的能级寿命直接反映了其内部的结构信息,是核性质研究中一个十分重要的物理参量。本工作报道了依托兰州重离子加速器装置,首次采取多普勒移动衰减法(DSAM)开展的原子核能级寿命测量。采取核反应12C(36Ar,2p)来布居46Ti的高激发态,利用新组建的大型高纯锗(HPGe)探测器阵列进行符合测量。根据γ能谱分别提取了4+、5-、6-态的能级寿命,并得到了这些态的跃迁概率。理论上采取大规模组态混合壳模型进行计算,并得出了能级的组态信息。  相似文献   

9.
以15.0和21.7MeV/A的28Si束轰击238U靶,测量出裂变核在反应中得到的线动量转移(LMT)分布.从LMT分布上的不同区段,将非完全熔合裂变(ICF)与跟随裂变(SF)分开;并给出SF产额与总裂变产额的比值.从裂片在围绕反应平面上下的分布宽度,讨论了粒子发射使裂片反冲的效应.  相似文献   

10.
从裂片关联测量给出的线性动量转移(LMT)分布,将非完全熔合裂变与跟随裂变事件分开,分别给出其裂变角分布.用卡西尼亚卵形体计算惯性矩,采用常规方法拟合裂变角分布,提取裂变核自旋值,讨论其随入射能的变化关系.此外,还讨论了与复杂粒子符合的裂变角分布.  相似文献   

11.
采用(111)面阻塞效应测量了Ep=1565keV共振时27Al(p,α)24Mg核反应寿命。用解析方法分析实验数据。测到的核寿命τ=17.9-4.0+4.4as,与<110>轴阻塞效应测量结果和文献给出的结果在误差范围内一致。测量了Ep=1183.4keV时(111)面的α粒子的阻塞分布,并与理论计算作了比较。 关键词:  相似文献   

12.
Elastic 28Si28Si scattering has been studied microscopically with special emphasis on quasimolecular and barrier resonances in high partial waves. Schematic application of the double resonance mechanism predicts intermediate structures in the excitation functions in qualitative agreement with the experimental data.  相似文献   

13.
The polarization of 21 MeV 3He elastically scattered from 27Al and 28Si has been measured in an angular range of θlab = 25°–55°. Differential cross-section data have been obtained out to angles of approximately 100°. The small values observed in the polarization distributions differ somewhat from optical-model predictions based on fits to the differential cross-section data and cannot be used to obtain significant information about the optical-model spin-orbit potential. It is concluded that statistically significant, non-zero 3He polarization measurements will not be possible using traditional double scattering techniques for 3He energies ≦ 27 MeV and targets of Z ≧ 13.  相似文献   

14.
Transient field precession measurements have been performed on the first excited Jπ = 2+ states of 28Si and 30Si with the IMPAC technique on recoil in magnetized iron. The results were analyzed with empirically adjusted Lindhard-Winther predictions. This yields g-factors of g = +0.56 ± 0.09 and g = +0.56 ± 0.16 for28Si and 30Si, respectively. In the present cases the influence of static hyperfine fields is negligible due to the very short mean lives for 28Si and 30Si of 0.68 and 0.35 ps, respectively. The results are compared with theoretical calculations. Previous results for 26Mg(21+) were reanalyzed with the more recent lifetime of τm = 0.72 ± 0.03 ps. The value of the g-factor becomes g = +0.82 ± 0.16.  相似文献   

15.
The (3He, d) reaction at a sufficiently high energy is considered to be a reliable single-proton stripping direct reaction. The data for the low-lying states produced by this reaction on 24Mg and 28Si are compared to the predictions of the strong-coupling rotational model. The agreement with the model predictions for 25Al is quite good, both for the single-proton spectroscopic factors in that nucleus and most particularly for the excitation of 72+ states in 25Al and 29P by two-step processes.  相似文献   

16.
The excitation energies of the levels in 30Si have been measured up to an excitation of 9.46 MeV with the 28Si(t, p)30Si reaction at a triton energy of 6.0 MeV. Angular distributions have been measured of proton groups from the 28Si(t, p)30Si and 29Si(d, p)30Si reactions in a multi-angle magnetic spectrograph. Triton bombarding energies of 10.5 and 12.1 MeV were used and the deuteron incident energy was 10.0 MeV. States in 30Si up to an excitation of 8 MeV were observed. Spins and parities of several states have been assigned using an empirical method for the (t, p) results and using a DWBA analysis for the (d, p) distributions. Spectroscopic factors for twelve states were obtained from the latter analysis. Two of these disagree with theoretical predictions. The state previously reported at an excitation of 6.63 MeV in 30Si was observed to be formed by a strong L = 0 transition in the (t, p) reaction and also by a strong l = 1 transition in the (d, p) reaction. We deduce that there are two closely spaced states at about this excitation, one having a spin and parity of 0+ and the other 0?, 1? or 2?.  相似文献   

17.
本文介绍用γ共振吸收法检验24Mg核11.528MeV能级的实验结果。实验中在此能级的附近能区意外地发现多个精细能级,数据分析给出这些能级的能量Er和宽度Гa等数据,同时还获得了与以往数据不同的发射能级宽度Гe关键词:  相似文献   

18.
19.
Alpha particles have been measured in coincidence with heavy recoil nuclei from the 28Si + 12C reaction. At Elab = 87 MeV angular correlations for alphas between 15° and 55° and heavy ions at angles ?9°, ?12° and ?15° have been taken. An excitation function of coincidence events with θα = 30° and θHI = ?12° has been measured for 84 MeV < Elab < 91.5 MeV. The results are well described by a statistical-model calculation for compound nucleus decay. No evidence is found for additional processes.  相似文献   

20.
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