排序方式: 共有8条查询结果,搜索用时 15 毫秒
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傅元勇 周书华T. Koike S. Kinoshita Y. Ma Y. Miura K. Miwa Y. Miyagi K. Shirotori T. Suzuki H. Tamura K. Tsukada M. Ukai K. Futatsukawa K. Hosomi M. Kawai M. Mimori N. Terada N. Maruyama K. Aoki H Fujioka Y Kakiguchi T. Nagae D. Nakajima H Noumi T Takahashi T.N. Takahashi A. Toyota M. Dairaku T. Fukuda S. Minami W. Imoto S. Aiimura K. Tanida 《中国物理快报》2007,24(8):2216-2218
From the ^12 C(π^+,K^+)^12 AC reaction the γ -rays of 261.6±0.24 ke V(7/2^+ →5/2^+)and 1481.7±0.7 ke V(1/2^+ →5/2^+) of ^11 A B,and 2667.3±2.8 keV(1^- 2 → 2^- 1)of ^12 A C hypernuclei have been identified using a large germanium detector array Hyperball2 at K6 beam line of KEK. The observed energies of the transitions 1481.7keV and 261.6 keV are significantly different from the values predicted by the shell model using the △ and SN parameters determined from the ^7 △ Li data. 相似文献
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由于低能带电粒子核反应截面直接测量遇到的库仑位垒和电子屏蔽势的困难,基于准自由反应机制的特洛伊木马方法得到特别关注。利用Geant4模拟的结果,与在中国原子能研究院串列加速器上通过三体反应9Be+2H→8Be+2H+n对两体反应9Be+1H→8Be+2H的反应截面做的间接测量实验数据进行了比较,这是Geant4模拟在特洛伊木马方法中的首次应用。通过对模拟数据研究,提高了对实验数据的理解,也检验了模拟系统的可靠性,对今后的实验设计和改进提供了有益的意见。 相似文献
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使用中国原子能科学研究院HI-13串列加速器产生的32S离子轰击BOPET薄膜,薄膜在空气中陈化3个月后在专用装置中使用Na OH溶液蚀刻制备核孔膜,研究Na OH溶液浓度、蚀刻温度对微孔孔形的影响。在不同温度和蚀刻液浓度条件下,蚀刻出微孔孔径为0.2至0.93μm的亚微米核孔膜,计算其微孔锥角,得出微孔锥角随着蚀刻温度、蚀刻液浓度和微孔孔径的变化趋势。研究表明,采用低浓度、高温度的Na OH溶液蚀刻有利于减小微孔锥角,有利于制备较小孔径的核孔膜。如选用0.5mol/L的Na OH溶液浓度,在蚀刻温度为90℃的条件下蚀刻,此时蚀刻时间小于2 h,既可以得到高质量微孔膜也有利于提高生产效率。 相似文献
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将HI-13北京串列加速器次级束流线产生的放射性核素 7Be分别注入到天然Pt和Al中, 利用两个高纯锗探测器同时测量 7Be 经由7Li第一激发态衰变后跃迁到基态产生的478 keVγ射线产额随时间的变化, 结果在实验误差范围内(<0.14%)没有发现7Be衰变率在Pt与Al中有明显差别, 讨论了这两种材料的电子亲和势及有效电子密度与EC衰变率的关系。 We measured the variation of the decay rate of 7Be implanted in Pt and Al host materials by detecting the 478 keV γ ray emitted from the first excited state of 7Li which is produced by EC decay of 7Be with two HPGe detectors simultaneously, and found no difference of 7Be decay rate in Pt from that in Al within our experimental error (<0.14%). We discussed the relation of the decay rate variation with the electronic affinities and effective electron densities near the implanted ions in the two different host materials. 相似文献
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The Coulomb barrier and electron screening cause difficulties in directly measuring nuclear reaction cross sections of charged particles at astrophysical energies. The Trojan-horse method (THM) has been introduced to solve the difficulties as a powerful indirect tool. In order to understand experimental spectra better, Geant4 is employed to simulate the method. Validity and reliability of simulation data are examined by comparing the experimental data with simulated results. The Geant4 simulation of THM improves data analysis and is beneficial to the design for future related experiments. 相似文献
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The γ-rays and protons from an Ed = 20 keV deuteron beam incident on a D-Ti target were measured. A branching ratio of the 2H(d,γ)^4He reaction versus the ^2H(d,p)^3H reaction of Гγ/Гp = (1.061 0.34) x 10.7 has been obtained, and the astrophysical S factor of the ^2H(d,γ)He reaction at the center of mass energy Ecm ≈ 7 keV of (6.0±2.4) ×10^6 keV.b was deduced. 相似文献
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