A microscopic description of nuclear fission for r-process nucleosynthesis
r 过程核合成的核裂变的微观描述
基本信息
- 批准号:1947388
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:英国
- 项目类别:Studentship
- 财政年份:2017
- 资助国家:英国
- 起止时间:2017 至 无数据
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Although the basic mechanism of nuclear fission has been already explained more than 80 years ago by N. Bohr in terms of quantum tunnelling. It is still not possible to provide a microscopic description of all relevant available fission mechanisms - spontaneous, induced, beta-delayed, photo-fission - to a high level of accuracy.A microscopic description of nuclear fission does not only imply calculating life-times, but also the statistical distribution of charge and mass in the outgoing fragments as well the total energy of the system shared among them. This information is essential, especially in several astrophysical scenarios, for understanding the patterns observed in abundances of heavy elements in our Universe.The standard model based on rapid-neutron capture (r-process) to form elements heavier than Iron-56 heavily involves the concept of fission, since it represents the end-point of the mechanism. According to the fission lifetime and the length of neutron flux, fission can produce new seeds that can be used for new r-process events, thus changing the relative abundances of elements. Moreover fission is itself a source of neutron and gamma rays. Such extra neutrons can keep going the r-process even after the external neutron flux has stopped. This mechanism is called fission recycling and it involves very neutron rich nuclei that are not accessible via experimental measurements.To provide a microscopic description of fission, nuclear energy density functional calculations (NEDF) are used to calculate potential energy surfaces. Given the very complicated structure of these energy surfaces, one needs to perform thousands of NEDF calculations to explore the entire energy landscape. Consequently NEDF fission calculations are not very common and they are restricted to a few specific cases.Gaussian Process Emulation (GPE), a regression method from machine learning, can be used to reduce the computational burden of these massive calculations. GPE methods are based on very simple mathematical assumptions: a given energy surface in a multidimensional space can be modelled by a global trend term (a polynomial) and some Gaussian fluctuations on top of it.This project seeks to reduce the computational cost of calculating potential energy surfaces for fission, using GPE, and using other numerical tools to improve the efficiency of the NEDF calculations.
尽管核裂变的基本机制早在80多年前就已经被N。玻尔的量子隧穿理论。目前还不可能对所有相关的裂变机制--自发裂变、诱导裂变、β延迟裂变、光致裂变--提供高精度的微观描述。核裂变的微观描述不仅意味着计算寿命,还意味着计算出射碎片中电荷和质量的统计分布以及它们之间共享的系统总能量。这些信息对于理解我们宇宙中重元素丰度的模式至关重要,特别是在一些天体物理学场景中。基于快速中子捕获(r过程)形成比铁-56重的元素的标准模型大量涉及裂变的概念,因为它代表了机制的终点。根据裂变寿命和中子通量的长度,裂变可以产生新的种子,这些种子可以用于新的r过程事件,从而改变元素的相对丰度。此外,裂变本身就是中子和伽马射线的来源。即使外部中子通量停止后,这些额外的中子也可以继续进行r过程。这种机制被称为裂变再循环,它涉及非常富含中子的核,通过实验测量无法获得。为了提供裂变的微观描述,核能密度泛函计算(NEDF)用于计算势能面。考虑到这些能量表面的非常复杂的结构,人们需要执行数千次NEDF计算来探索整个能量景观。因此,NEDF裂变计算并不常见,仅限于少数特定情况。高斯过程仿真(GPE)是一种机器学习的回归方法,可以用来减少这些大规模计算的计算负担。GPE方法基于非常简单的数学假设:多维空间中的给定能量表面可以由全局趋势项(多项式)和其上的一些高斯波动建模。该项目旨在减少计算裂变势能表面的计算成本,使用GPE,并使用其他数值工具来提高NEDF计算的效率。
项目成果
期刊论文数量(1)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Advanced Statistical Methods to Fit Nuclear Models
- DOI:10.5506/aphyspolbsupp.12.649
- 发表时间:2018-11
- 期刊:
- 影响因子:0
- 作者:M. Shelley;Pascal Becker;A. Gration;A. Pastore
- 通讯作者:M. Shelley;Pascal Becker;A. Gration;A. Pastore
{{
item.title }}
{{ item.translation_title }}
- DOI:
{{ item.doi }} - 发表时间:
{{ item.publish_year }} - 期刊:
- 影响因子:{{ item.factor }}
- 作者:
{{ item.authors }} - 通讯作者:
{{ item.author }}
数据更新时间:{{ journalArticles.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ monograph.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ sciAawards.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ conferencePapers.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ patent.updateTime }}
其他文献
吉治仁志 他: "トランスジェニックマウスによるTIMP-1の線維化促進機序"最新医学. 55. 1781-1787 (2000)
Hitoshi Yoshiji 等:“转基因小鼠中 TIMP-1 的促纤维化机制”现代医学 55. 1781-1787 (2000)。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
LiDAR Implementations for Autonomous Vehicle Applications
- DOI:
- 发表时间:
2021 - 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
吉治仁志 他: "イラスト医学&サイエンスシリーズ血管の分子医学"羊土社(渋谷正史編). 125 (2000)
Hitoshi Yoshiji 等人:“血管医学与科学系列分子医学图解”Yodosha(涉谷正志编辑)125(2000)。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
Effect of manidipine hydrochloride,a calcium antagonist,on isoproterenol-induced left ventricular hypertrophy: "Yoshiyama,M.,Takeuchi,K.,Kim,S.,Hanatani,A.,Omura,T.,Toda,I.,Akioka,K.,Teragaki,M.,Iwao,H.and Yoshikawa,J." Jpn Circ J. 62(1). 47-52 (1998)
钙拮抗剂盐酸马尼地平对异丙肾上腺素引起的左心室肥厚的影响:“Yoshiyama,M.,Takeuchi,K.,Kim,S.,Hanatani,A.,Omura,T.,Toda,I.,Akioka,
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
的其他文献
{{
item.title }}
{{ item.translation_title }}
- DOI:
{{ item.doi }} - 发表时间:
{{ item.publish_year }} - 期刊:
- 影响因子:{{ item.factor }}
- 作者:
{{ item.authors }} - 通讯作者:
{{ item.author }}
{{ truncateString('', 18)}}的其他基金
An implantable biosensor microsystem for real-time measurement of circulating biomarkers
用于实时测量循环生物标志物的植入式生物传感器微系统
- 批准号:
2901954 - 财政年份:2028
- 资助金额:
-- - 项目类别:
Studentship
Exploiting the polysaccharide breakdown capacity of the human gut microbiome to develop environmentally sustainable dishwashing solutions
利用人类肠道微生物群的多糖分解能力来开发环境可持续的洗碗解决方案
- 批准号:
2896097 - 财政年份:2027
- 资助金额:
-- - 项目类别:
Studentship
A Robot that Swims Through Granular Materials
可以在颗粒材料中游动的机器人
- 批准号:
2780268 - 财政年份:2027
- 资助金额:
-- - 项目类别:
Studentship
Likelihood and impact of severe space weather events on the resilience of nuclear power and safeguards monitoring.
严重空间天气事件对核电和保障监督的恢复力的可能性和影响。
- 批准号:
2908918 - 财政年份:2027
- 资助金额:
-- - 项目类别:
Studentship
Proton, alpha and gamma irradiation assisted stress corrosion cracking: understanding the fuel-stainless steel interface
质子、α 和 γ 辐照辅助应力腐蚀开裂:了解燃料-不锈钢界面
- 批准号:
2908693 - 财政年份:2027
- 资助金额:
-- - 项目类别:
Studentship
Field Assisted Sintering of Nuclear Fuel Simulants
核燃料模拟物的现场辅助烧结
- 批准号:
2908917 - 财政年份:2027
- 资助金额:
-- - 项目类别:
Studentship
Assessment of new fatigue capable titanium alloys for aerospace applications
评估用于航空航天应用的新型抗疲劳钛合金
- 批准号:
2879438 - 财政年份:2027
- 资助金额:
-- - 项目类别:
Studentship
Developing a 3D printed skin model using a Dextran - Collagen hydrogel to analyse the cellular and epigenetic effects of interleukin-17 inhibitors in
使用右旋糖酐-胶原蛋白水凝胶开发 3D 打印皮肤模型,以分析白细胞介素 17 抑制剂的细胞和表观遗传效应
- 批准号:
2890513 - 财政年份:2027
- 资助金额:
-- - 项目类别:
Studentship
Understanding the interplay between the gut microbiome, behavior and urbanisation in wild birds
了解野生鸟类肠道微生物组、行为和城市化之间的相互作用
- 批准号:
2876993 - 财政年份:2027
- 资助金额:
-- - 项目类别:
Studentship
相似国自然基金
Research on Quantum Field Theory without a Lagrangian Description
- 批准号:24ZR1403900
- 批准年份:2024
- 资助金额:0.0 万元
- 项目类别:省市级项目
相似海外基金
Microscopic description of nuclear fission based on the generator coordinate method
基于发生器坐标法的核裂变微观描述
- 批准号:
23KJ1212 - 财政年份:2023
- 资助金额:
-- - 项目类别:
Grant-in-Aid for JSPS Fellows
Project 1 - Genes to Function: Causal Genes and their Roles in Cardiomyocyte and Atrial Physiology
项目 1 - 发挥功能的基因:因果基因及其在心肌细胞和心房生理学中的作用
- 批准号:
10646358 - 财政年份:2022
- 资助金额:
-- - 项目类别:
Multi-nuclear Iron Clusters as Biomimics of Nitrogenase Enzyme Metallocofactors
多核铁簇作为固氮酶金属辅因子的仿生
- 批准号:
10700023 - 财政年份:2022
- 资助金额:
-- - 项目类别:
Project 1 - Genes to Function: Causal Genes and their Roles in Cardiomyocyte and Atrial Physiology
项目 1 - 发挥功能的基因:因果基因及其在心肌细胞和心房生理学中的作用
- 批准号:
10410648 - 财政年份:2022
- 资助金额:
-- - 项目类别:
Nuclear DFT description of proton-neutron pairing correlations in N~Z nuclei
N~Z 核中质子-中子配对相关性的核 DFT 描述
- 批准号:
2601715 - 财政年份:2021
- 资助金额:
-- - 项目类别:
Studentship
Radionuclide Production and Radiochemistry Core Description Core
放射性核素生产和放射化学核心描述核心
- 批准号:
10416050 - 财政年份:2020
- 资助金额:
-- - 项目类别:
Radionuclide Production and Radiochemistry Core Description Core
放射性核素生产和放射化学核心描述核心
- 批准号:
10263251 - 财政年份:2020
- 资助金额:
-- - 项目类别:
Radionuclide Production and Radiochemistry Core Description Core
放射性核素生产和放射化学核心描述核心
- 批准号:
10672957 - 财政年份:2020
- 资助金额:
-- - 项目类别:
Radionuclide Production and Radiochemistry Core Description Core
放射性核素生产和放射化学核心描述核心
- 批准号:
10024891 - 财政年份:2020
- 资助金额:
-- - 项目类别:
Theoretical description of nuclear quantum effects in photocatalytic reactions
光催化反应中核量子效应的理论描述
- 批准号:
391320977 - 财政年份:2017
- 资助金额:
-- - 项目类别:
Research Fellowships