分类: 物理学 >> 核物理学 提交时间: 2024-02-29
摘要: The 28nm process has a high cost-performance ratio and has gradually become the standard for the fieldof radiation-hardened devices. However, owing to the minimum physical gate length of only 35nm, the physicalarea of a standard 6T SRAM unit is approximately 0.16 μm2, resulting in a significant enhancement ofmulti-cell charge-sharing effects. Multiple-cell upsets (MCUs) have become the primary physical mechanismbehind single-event upsets (SEUs) in advanced nanometer node devices. The range of ionization track effectsincreases with higher ion energies, and spacecraft in orbit primarily experience SEUs caused by high-energyions. However, ground accelerator experiments have mainly obtained low-energy ion irradiation data. Therefore,the impact of ion energy on the SEU cross-section, charge collection mechanisms, and MCU patterns andquantities in advanced nanometer devices remains unclear. In this study, based on the experimental platformof the Heavy Ion Research Facility in Lanzhou (HIRFL), low- and high-energy heavy-ion beams were usedto study the SEUs of 28nm SRAM devices. The influence of ion energy on the charge collection processesof small-sensitive-volume devices, MCU patterns, and upset cross-sections was obtained, and the applicablerange of the inverse-cosine law was clarified. The findings of this study are an important guide for the accurateevaluation of SEUs in advanced nanometer devices and for the development of radiation-hardening techniques.
分类: 物理学 >> 核物理学 提交时间: 2023-12-15
摘要: Nondestructive and noninvasive neutron assays are essential applications of neutron techniques. Neutron resonance transmission analysis (NRTA) is a powerful nondestructive method for investigating the elemental composition of an object. The back-streaming neutron line (Back-n) is a newly built time-of-flight facility at the China Spallation Neutron Source (CSNS) that provides neutrons in the eV to 300 MeV range. A feasibility study of the NRTA method for nuclide identification was conducted at the CSNS Back-n via two test experiments. The results demonstrate that it is feasible to identify different elements and isotopes in samples using the NRTA method at Back-n. This study reveals its potential future applications.
分类: 物理学 >> 核物理学 分类: 物理学 >> 地球物理学、天文学和天体物理学 提交时间: 2023-09-12
摘要: The neutron capture cross sections (${n, upgamma}$) of Bromine was performed with the time-of-flight (TOF) technique at the Back-n facility of the China Spallation Neutron Source (CSNS). Prompt $ upgamma$-rays originating from neutron-induced capture events were detected by four C${}_6$D${}_6$ detectors. The pulse height weighting technique (PHWT) and the double-bunch unfolding method based on the Bayesian theory were used in the data analysis. To obtain reliable measurement results, background deductions, normalization, and corrections were carefully considered. The multilevel R-matrix Bayesian code SAMMY was used to extract the resonance parameters in the resolved resonance region (RRR). The average cross sections in unresolved resonance region the was obtained from 10 to 400 keV. The experimental results were compared with the data of several evaluated libraries and previous experiments in the resolved and unresolved resonance region. The TALYS code was used to describe the average cross sections in the unresolved resonance region. Astrophysical Maxwell average cross sections (MACSs) of ${}^{79,81}$Br from $ kT $ = 5 to 100 keV was calculated over a sufficiently wide range of neutron energies. At a thermal energy of $kT=30$ keV, the MACS value for ${}^{79}$Br 638$ pm$64 mb is in good agreement with the KADoNiS recommended value. By contrast, the value of 293$ pm$29 mb for ${}^{81}$Br is substantially higher than those of the evaluated database and the KADoNiS recommended value.