次級中子 的英文怎麼說
中文拼音 [cìjízhōngzi]
次級中子
英文
secondary neutron-
In most recent studies, researchers have analyzed aluminum - rich minerals such as anorthite and hibonite using an ion microprobe, which bombards a sample with a focused ion beam to release secondary ions from the sample ' s surface
在最新的研究中，科學家使用離子微探針來分析鈣長石、黑鋁鈦鈣石等富含鋁的礦物，以聚焦的離子束撞擊樣本，使樣本表面釋出次級離子。This is usually the region from which most of the secondary particles emanate.
大多數次級粒子通常是從這個區域中發射出來的。The secondary electron effect is incorporated into the simulation, which are divided into true secondary and reflected primary electrons
分析了次級電子發射的特性，在模擬中將次級電子近似分為真實次級電子和反射的原電子分別處理。It was found that the simple triangular shape distribution would cause " two - peaked " energy distribution near the threshold energy, which must affect the group transfer matrix
閾能處三角形能譜分佈的近似描述，導致產生了群散射矩陣的「雙峰」現象，而閾能處矩形能譜分佈使平均次級中子能量（When the energy distribution of secondary neutron are represented by evaporation spectrum ( lf = 9 ), care must be taken in describing the nuclear temperature near the threshold
通過分析發現，評價次級中子能譜數據所採用的蒸發譜模型大都忽略了能級密度參數與激發能之間的關聯。Surface chemical analysis - secondary ion mass spectrometry - determination of boron atomic concentration in silicon using uniformly doped materials
表面化學分析.次級離子質譜法.利用均勻摻雜材料測定硅中硼原子濃度The large nuclear temperature evaluation would violate conservation of energy, and may lead a negative neutron kerma factor
這就可能使評價核溫度太高而導致平均次級中子能量（ ? ）過大，破壞了能量守恆，而導致了負kerma因子。The ddx of neutron emission is one of the most important nuclear data in nuclear design. more precise nuclear data, not only nuclear reaction data but also energy and angular distributions, are required by the development of nuclear engineering
次級中子雙微分截面是核工程設計中重要的核數據之一，隨著對核工程設計要求的日益提高，對核數據的要求也越來越高，不僅要求有精確的核反應截面數據，還要有精確的能譜和角分佈數據。As well known, in the file 5 of endf - vi, the energy distribution of secondary neutron are represented by various analytical formulations
眾所周知，在評價核數據庫endf -版的文檔5中，次級中子能量分佈數據以不同的表達方式來描述。The double differential cross section ( ddx ) of neutron emission from 51v at 10. 26 mev neutrons was measured using normal and abnormal fast neutron tof spectrometers on hi - 13 tandem accelerator in china institute of atomic energy ( ciae ). the problem of influence from breakup neutrons of the d ( d, n ) neutron source on secondary neutron spectra was successfully solved
用中國原子能科學研究院hi - 13串列加速器上的常規和非常規快中子飛行時間譜儀，測量了10 . 26mev中子引起~ （ 51 ） v的次級中子雙微分截面，成功解決了d （ d ， n ）中子源中破裂中子對次級譜的影響。A lot of methods were used in measurement and data analysis to improve the quality of the data. the measured tof spectra were simulated by monte - carlo code streuer. the cross sections were determined by comparing the measured tof spectra with the simulated tof spectra and the data were normalized to n - p scattering measurement
本論文利用ciae發展起來的常規和非常規快中子飛行時間譜儀，利用d （ d ， n ） ~ 3he中子源，測量了10 . 26mev中子引起的~ （ 51 ） v的次級中子雙微分截面，成功解決了源破裂中子對次級譜的影響。The recoil atoms with high energy and the residual nuclear are dealt with in a strict way
計算中對核散射產生的次級粒子及核反應剩餘核都進行了跟蹤。Surface chemical analysis - secondary - ion mass spectrometry - determination of boron atomic concentration in silicon using uniformly doped materials
表面化學分析.次級離子質光譜測定法.採用均勻塗料的硅中硼原子濃度測定The measurement data is scarce in 8 - 13 mev region due to the lack of mono - energetic neutron sources ( in this region, there are breakup neutrons besides the mono - energetic neutrons in the often used neutron sources such as t ( p, n ) 3 he and d ( d, n ) 3he sources. the secondary neutrons induced by breakup source neutrons will seriously contaminate the secondary neutron spectra induced by mono - energetic source neutrons ). therefore, precise measurement for some key nuclides is necessary to check the evaluations in this region
但在8 ? 13mev這一能區，由於沒有合適的單能中子源（因為在這一能區，對于常規中子源如t （ p ， n ） ~ 3he和d （ d ， n ） ~ 3he中子源，除了單能中子以外，還有破裂中子成份，這部分源破裂中子在樣品上引起的次級中子，將嚴重影響測量結果） ，所以至今在8 ? 13mev能區這方面的測量數據極少。For our analysis we selected 8 events with large multiplicity, for example in each event multiplicity is greater than 1000, from emu01 ( emu12 ) database. firstly the data of polarized angle of flying - out particles is extracted and its distribution ( histogram ) is given
出於研究目的和分析方法的高多重數事例需要，我們挑選了emu01 （ emu12 ）數據庫中多重數較大的8個事例（每個事例帶電次級粒子數均大於1000 ） 。Moreover, precise experimental data are the base of theoretical models and calculations. up to now, at about 14 mev, there are some ddx measurement data because the t ( d, n ) 4he reaction is a good mono - energetic neutron source. below 8 mev, there are also some measurements because mono - energetic neutron source is available in this region
到目前為止，在14mev附近，由於有很好的t （ d ， n ） ~ 4he單能中子源，所以次級中子雙微分截面的測量數據較多，在8mev以下，也可以得到很好的單能中子源，所以也有一些測量數據。The rectangular shape would make the e ' _ ( n ) too large, which can violate conservation of energy and may lead a negative neutron kerma ( kinetic energy release in materials ) factor
）過大，從而產生負kerma （ kineticenergyreleaseinmaterials ）因子。文檔5中的次級中子數據以蒸發譜來描述時，一些核素也出現了負kerma因子現象。In this paper, we will discuss the reason of these abnormal behaviors, and give some recommendation to modify the related data in the endf - vi ( or other nuclear data library, e. g. cendl - 2 etc. ), to improve the energy balance to eliminate the problem
針對這兩種不同的次級中子能譜描述方式，本文嘗試用多種較簡便方法來針對endf -庫的相關數據做一定的修正，以改善某些能點的次級中子能譜的能量守恆問題。When cosmic rays enter the atmosphere, they interact with nitrogen, oxygen and other atoms in the upper atmosphere and produce a large assortment of secondary particles, including radionuclides such as tritium and carbon - 14, neutrons, protons, electrons, mu
宇宙射線進入地球大氣層后，會與大氣高層的氮氧等原子核發生反應，產生氚碳- 14等放射性核素及中子質子電子介子介子等次級粒子。When cosmic rays enter the atmosphere, they interact with nitrogen, oxygen and other atoms in the upper atmosphere and produce a large assortment of secondary particles, including radionuclides ( such as tritium and carbon - 14 ), neutrons, protons, electrons, mu
宇宙射線進入地球大氣層后，會與大氣高層的氮、氧等原子核發生反應，產生氚、碳- 14等放射性核素及中子、質子、電子、介子、介子等次級粒子。分享友人