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Recent results and progress of mass measurements of neutron-rich nuclei utilizing Isochronous Mass Spectrometry (IMS) based on the HIRFL-CSR complex at Lanzhou are reported. The nuclei of interest were produced through projectile fragmentation of primary 86Kr ions at a realistic energy of 460.65 MeV/u. After in-flight separation by the fragment separator RIBLL2, the fragments were injected and stored in the experimental storage ring CSRe, and their masses were determined from measurements of their revolution times. The re-determined masses were compared and evaluated with other mass measurements, and the impact of these evaluated masses on the shell evolution study is discussed. 相似文献
84.
The luminosity for a WASA-at-COSY experiment involving the pd reaction at 2.14 GeV proton-beam energy is determined by the forward pd elastic scattering, which yields an average beam-on-target value of [5.2 ± 0.3(stat) ± 0.3syst] × 1030s-1cm-2. In addition, the forward pd elastic-scattering angular distribution is obtained with four-momentum transfer squared -t between 0.16 (GeV/c)2 and 0.78 (GeV/c)2 at this beam energy, which is compared with other experimental data and the pd double scattering model. 相似文献
85.
The mirror nuclei ^12N and ^12B are separated by the Radioactive Ion Beam Line in Lanzhou (RIBLL) at HIRFL from the breakup of 78.6 MeV/u 14N on a Be target. The total reaction cross-sections of ^12N at 34.9 MeV/u and ^12B at 54.4 MeV/u on a Si target have been measured by using the transmission method. Assuming ^12N consists of a ^11C core plus one halo proton, the excitation function of ^12N and ^12B on a Si target and a C target were calculated with the Glanber model. It can fit the experimental data very well. The characteristic halo structure for ^12N was found with a large diffusion of the protons density distribution. 相似文献
86.
We measured the total reaction cross sections of 12N in Si at 36.2 MeV/u using Radioactive Ion Beam Line in Lanzhou (RIBLL) with a new method. The reaction target was installed at the intermediate focusing point T1 at RIBLL. This scheme allows us to identify particles before and after the reaction target unambiguously. The total reaction cross section (1760±78 mb) of ^12N in Si is obtained. Assuming that ^12N consists of a core ^11C plus one halo proton, the excitation function of 12N on the Si and C targets is calculated with the Glauber model and the Fermi-Fermi density distributions. It can fit the experimental data very well. A large diffusion of the protons density distribution supports the halo structure for ^12N. 相似文献
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基于Monte Carlo方法对HIRFL CSRm上的TPC的性能进行了模拟.研究了磁场、读出电极几何尺寸、灵敏丝距以及读出电极平面与灵敏丝平面之间的距离等参数对TPC性能的影响,给出了TPC的一些最佳设计参数. Based on Monte-Carlo method the time projection chamben s (TPC s) performance at HIRFL-CSRm has been simulated. We have already studied the effect of magnetic field, wire space, the size of readout pad and the distance between the pad plane and the wire plane on the performance of TPC. At the same time some important results are given for designing TPC. 相似文献
90.
在中国原子能科学研究院的HI-13串列静电加速器上完成了114MeV和118.75MeV的19F+27Al耗散反应产物B, C, N, O, F, Ne, Na和Mg的微分截面测量. 条形27Al同位素靶的大小尺寸为10mm×50mm, 平均
厚度约67μg/cm2. 固定入射束流19F的能量, 通过移动靶位, 先后轰击了靶上20个不同的位置.实验结果表明, 在弹靶系统、入射能量以及探测系统都相同的多次独立的微分截面测量中, 截面的涨落不呈现高斯型几率分布. 截面测量的这种不重复现象难以用有限计数率的统计性质来解释. 相似文献