排序方式: 共有8条查询结果,搜索用时 15 毫秒
1
1.
Low-lying and high-spin states of ^124 Cs are studied through the ^116 Sn(^11 B,3n)^124 Cs reaction at a beam energy of 45 MeV. Several new linking transitions are observed, including three transitions between the yrast and πh11/2 vd3/2 bands and two transitions between the yrast and πh11/2 v(d5/2, g7/2) bands. These transitions fix the excitation energy of the yrast band and its decay path, and confirm the existence of eight E1 finking transitions between the yrast and πh11/2 v(d5/2, 97/2) bands observed before. These E1 linking transitions infer the oetupole correlation in ^124Cs. The decay paths of the yrast band are investigated, and discrepancies in the level scheme of ^124Cs in the latest two studies are clarified. The reason for the discrepancies is discussed. A new decoupled band is established and temporarily assigned as the unfavored signature partner of πh11/2 vd3/2 configuration. 相似文献
2.
High spin states of 128La have been studied through the fusion-evaporation reaction 118Sn(14N,4n) 128La at a beam energy of 69 MeV. A positive-parity side band with the same configuration as that of the yrast band has been identified. Moreover, it is noted that the energy separation △E(I) = E(I)side-E(I)yrast of all doublet bands reported in odd-odd nuclei in the A~130 mass region exhibit a staggering pattern systematically, and they stagger up at even-spin and stagger down at odd-spin. 相似文献
3.
4.
杨彦佶 陆景彬 王于仨 陈勇 徐玉朋 崔苇苇 李炜 李正伟 李茂顺 刘晓艳 王娟 韩大炜 陈田祥 李承奎 霍嘉 胡渭 张艺 陆波 朱玥 马克岩 吴帝 刘琰 张子良 尹国和 王宇 《中国物理 C》2014,38(8)
The Low Energy X-ray Telescope is one of the main payloads on the Hard X-ray Modulation Telescope satellite.Swept charge devices(SCDs)are selected as detectors for the Low Energy X-ray Telescope.As SCDs are sensitive to proton irradiation,irradiation tests were carried out on the HI-13 accelerator at the China Institute of Atomic Energy.The beam energy was measured to be 10 MeV at the SCD.The proton fluence delivered to the SCD was 3×108protons/cm2over two hours.By comparing the performance before and after irradiation,it is concluded that proton irradiation affects both the dark current and the charge transfer inefficiency of the SCD.The energy resolution of the proton-irradiated SCD is 212 eV@5.9 keV at-60?C,while it before irradiated is 134 eV.Moreover,better performance can be reached by lowering the operating temperature of the SCD in orbit. 相似文献
5.
刘晓艳 陆景彬 杨彦佶 陆波 王于仨 徐玉朋 崔苇苇 李炜 李茂顺 王娟 韩大炜 陈田祥 霍嘉 胡渭 张艺 朱玥 张子良 尹国和 王宇 赵仲毅 付艳红 张娅 马克岩 陈勇 《中国物理 C》2015,39(7)
Readout noise is a critical parameter for characterizing the performance of charge-coupled devices (CCDs), which can be greatly reduced by the correlated double sampling (CDS) circuit. However, a conventional CDS circuit inevitably introduces new noise since it consists of several active analog components such as operational amplifiers. This paper proposes a digital CDS circuit technique, which transforms the pre-amplified CCD signal into a train of digital presentations by a high-speed data acquisition card directly without the noisy CDS circuit, then implements the digital CDS algorithm through a numerical method. A readout noise of 3.3 e- and an energy resolution of 121 eV@5.9 keV can be achieved via the digital CDS technique. 相似文献
6.
High spin states of the odd-A 87Sr were populated by the fusion-evaporation reaction 82Se(9Be, 4n) 87Sr at a beam energy of 46 MeV. Excited levels of 87Sr have been extended up to an excitation energy of 7.4 MeV at spin 31/2ħ. The coupling of a g9/2 neutron hole to the yrast states of the 88Sr core can account for the low-lying states in 87Sr. The structure of the higher spin states is discussed by analogy with those of the neighboring odd-A N=49 isotones and possible configurations are proposed. 相似文献
7.
The level structures of 93 Mo are investigated using Large Scale Shell Model calculations,and reasonable agreement is obtained between the experimental and calculated values.The calculated results show that the lower-lying states are mainly dominated by proton excitations from the If5/2,2 p3/2,and 2 p1/2 orbitals into the higher orbitals across the Z=38 or Z=40 subshell closure.For the higher-spin states,multi-particle excitations,including the excitation of 2 d5/2 neutrons across the N=56 subshell closure into the high-j intruder 1 h11/2 orbital,are essential.Moreover,the previously unknown spin-parity assignments of the six higher excited states in 93 Mo are inferred from the shell model calculations. 相似文献
8.
In boron neutron capture therapy (BNCT), the ratio of the fast neutron flux to the neutron flux in the tumor (RFNT) must be less than 3%. If a D-T neutron generator is used in BNCT, the 14 MeV neutron moderator must be optimized to reduce the RFNT. Based on the neutron moderation theory and the simulation results, tungsten, lead and diamond were used to moderate the 14 MeV neutrons. Satisfying RFNT of less than 3%, the maximum neutron flux in the tumor was achieved with a three-layer moderator comprised of a 3 cm thick tungsten layer, a 14 cm thick lead layer and a 21 cm thick diamond layer. 相似文献
1