CS和SG应变梯度介质的椭球形Eshelby张量

<正>研究了CS(偶应力)和SG(二阶梯度)应变梯度复合材料中的单夹杂问题,分别得到了无限大各向同性CS和SG应变梯度介质中含有椭球形夹杂时的Eshelby张量的解析表达式,该解析解只包含一个一维积分,是目前应变梯度椭球形Eshelby张量最简单的形式。球形夹杂、长纤维夹杂的Eshleby张量都可以由它简化得到,是其一

47 MeV/u ~(12)C与~(133)Cs反应中碘同位素产生截面的Q_(gg)依赖关系

用47 MeV/u 12C离子轰击133Cs靶,应用放射化学分离技术和离线γ射线谱学,得到碘同位素的产生截面。丰中子碘同位素的独立产生截面指数地依赖于Qgg值,而缺中子碘同位素的独立产生截面则偏离这一直线关系。这一事实可对在深部非弹转移过程中产生丰中子碘同位素予以解释。

~(12)C与~(133)Cs反应中Ba同位素的Q_(gg)产额依赖

使用47MeV/u12C离子轰击133Cs靶,由多核子转移反应产生Ba同位素。使用放射化学方法,从133Cs和反应产物中分离出产物Ba,再使用高纯Ge探测器测量Ba放射性同位素的γ活性,根据Ba同位素的活度和其他相关数据,确定Ba同位素的产生截面。通过分析测得的Ba同位素的厚靶平均产生截面,发现缺中子Ba同位素的独立截面不遵从规则的Qgg系统性。该结果可用重离子碰撞中的次级过程加以解释。

CsI(T1)晶体探测器APD读出的温度效应

对中国科学院近代物理研究所自行生长的铊激活碘化铯闪烁晶体CsI(T1)光输出及Hamamtsu公司生产的S8664-1010型雪崩光二极管(APD)增益对温度的依赖关系做了系统研究.结果表明,CsI(T1)晶体光产额在室温范围内随着温度的增加而增加,在-2℃—8℃温度范围内的平均温度系数为0.67%/℃,在8℃—25℃温度范围内的平均温度系数为0.33%/℃.而对所使用的APD,其增益在室温范围内的温度系数为-3.68%/℃(工作电压400V).APD结合CsI(T1)晶体在室温下对~(137)Cs的662keYγ射线的能量分辨可达5.1%.

~(125)Cs的能级结构

通过116Cd(14N,5n),Ebeam=65MeV的核反应布居了125Cs的高自旋态.利用在束γ谱学实验方法,进行了γ γ符合测量,使已知的125Cs核能级纲图得到了扩展,并且修正了某些组态的带头激发能.

~(126)Cs的高自旋态能级结构

利用融合蒸发反应 116Cd(14 N ,4n) 12 6Cs布居了 12 6Cs的高自旋态 .观测到了 10 0多条新的γ跃迁和相应的能级 ,建立了双奇核 12 6Cs由 9个转动带构成的能级纲图 .尝试性地指定了大部分能级的自旋和宇称以及各转动带的Nilsson单粒子组态 .极大地丰富了已有的实验结果 .

Characteristics of carbonate content and carbon and oxygen isotopic composition of northern China soil and dust aerosol and its application to tracing dust sources

IEECAS SKLLQG

Observation of negative-parity high spin states of Cs-126

The nucleus Cs-126 was investigated by means of in-beam gamma-ray spectroscopy techniques using the Nordball detector system at the Niels Bohr Institute. Excited states of Cs-126 were populated via the Cd-116(N-14, 4n)Cs-126 reaction at a beam energy of 65 MeV. The Cs-126 level scheme was considerably extended, especially at negative parity and about 40 new levels and 70 new transitions were added into the level scheme. The previously reported negative-parity rotational bands, built on pi g(7/2)circle times nu h(11/2),pi d(5/2)circle times nu h(11/2),pi h(11/2)circle times nu g(7/2), and pi h(11/2)circle times nu d(5/2) configurations, have been extended and evolve into bands involving rotationally aligned (pi h(11/2))(2) and (nu h(11/2))(2) quasiparticles. Two new rotational bands have been tentatively assigned the pi h(11/2)circle times nu s(1/2) and pi g(9/2)circle times nu h(11/2) configurations, respectively

Conformal irradiation to moving targets in heavy ion radiotherapy with raster-scanning beam delivery system: (II) feasibility experiments

Within the framework of the pilot heavy-ion therapy facility at GSI equipped with an active beam delivery system of advanced raster scanning technique, a feasibility study on actively conformal heavy-ion irradiation to moving tumors has been experimentally conducted. Laterally, real-time corrections to the beam scanning parameters by the raster scanner, leading to an active beam tracing, compensate for the lateral motion of a target volume. Longitudinally, a mechanically driven wedge energy degrader (called depth scanner) is applied to adjust the beam energy so as to locate the high-dose Bragg peak of heavy ion beam to the slice under treatment for the moving target volume. It has been experimentally shown that compensations for lateral target motion by the raster scanner and longitudinal target shift by the depth scanner are feasible.

Candidate chiral doublet bands in the odd-odd nucleus Cs-126

The candidate chiral doublet bands recently observed in Cs-126 have been extended to higher spins, several new linking transitions between the two partner members of the chiral doublet bands are observed, and gamma-intensities related to the chiral doublet bands are presented by analyzing the gamma-gamma coincidence data collected earlier at the NORDBALL through the Cd-116(N-14, 4n)Cs-126 reaction at a beam energy of 65 MeV. The intraband B(M1)/B(E2) and interband B(M1)(in)/B(M1)(out) ratios and the energy staggering parameter, S(I), have been deduced for these doublet bands. The results are found to be consistent with the chiral interpretation for the two structures. Furthermore, the observation of chiral doublet bands in Cs-126 together with those in Cs-124, Cs-128, Cs-130, and Cs-132 also indicates that the chiral conditions do not change rapidly with decreasing neutron number in these odd-odd Cesium isotopes.