Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms最新文献_第7页

L-subshell production cross sections of Lu and Hf by 10 keV-30 keV electron bombardment 10kv - 30kev电子轰击Lu和Hf的l -亚壳生成截面

IF 1.4 3区物理与天体物理

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms Pub Date : 2025-03-01 DOI: 10.1016/j.nimb.2025.165668

J.L. Zhao , Z. An , J.J. Zhu , H. Huang , W.J. Tan , M.T. Liu , S. Bai , J.L. Lai , X.T. Wang

{"title":"L-subshell production cross sections of Lu and Hf by 10 keV-30 keV electron bombardment","authors":"J.L. Zhao , Z. An , J.J. Zhu , H. Huang , W.J. Tan , M.T. Liu , S. Bai , J.L. Lai , X.T. Wang","doi":"10.1016/j.nimb.2025.165668","DOIUrl":"10.1016/j.nimb.2025.165668","url":null,"abstract":"<div><div>The L-subshell X-ray production cross sections (XRPCSs) were measured for the heavy elements Lu (Z = 71) and Hf (Z = 72) induced by the bombardment of single-energy electron beams of 10 keV-30 keV. The generated X-ray spectra from the thin targets with thick carbon substrates were collected using a silicon drift detector. Corrections for excess X-rays, arising from electron multiple scattering, bremsstrahlung and backscattered electrons from the thick substrates, were performed using Monte Carlo simulations. The experimental results were compared with theoretical values based on the distorted-wave Born approximations and two sets of atomic relaxation parameters. Overall, the experimental XRPCSs of Lu and Hf are closer to the theoretical values based on the fluorescence yields and Coster-Kroning probabilities from Dirac-Hartree-Slater (DHS) calculations and emission rates from Dirac-Fock (DF) calculations within the experimental and theoretical uncertainties in the entire incident electron energy region.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":"562 ","pages":"Article 165668"},"PeriodicalIF":1.4,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143519256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An approximate analytical formula for 3D dose deposition in water by a Gaussian proton beam 高斯质子束在水中三维剂量沉积的近似解析公式

IF 1.4 3区物理与天体物理

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms Pub Date : 2025-02-27 DOI: 10.1016/j.nimb.2025.165653

E. Nichelatti , C. Ronsivalle

引用次数: 0

Determination of the natTi(d,x)49V excitation function by liquid scintillation analysis 液体闪烁法测定natTi(d,x)49V激发函数

IF 1.4 3区物理与天体物理

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms Pub Date : 2025-02-27 DOI: 10.1016/j.nimb.2025.165652

C.R. Kleinfeldt , V.S. Bodnar , S.D. Essenmacher , A.M. Miller , G.M. Brown , G.F. Peaslee , G.W. Severin

引用次数: 0

Differential cross section measurement of the reactions 16O(d, p0,1)17O for Nuclear Reaction Analysis (NRA) 核反应分析（NRA）中反应16O(d, p0,1)17O的微分截面测量

IF 1.4 3区物理与天体物理

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms Pub Date : 2025-02-19 DOI: 10.1016/j.nimb.2025.165648

R. Ghasemi , A. Ramazani-Moghaddam-Arani , O. Kakuee , A. Ziagkova

引用次数: 0

Principle design of a high-power graphite target for the HFRS separator at HIAF HFRS分离器大功率石墨靶的原理设计

IF 1.4 3区物理与天体物理

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms Pub Date : 2025-02-18 DOI: 10.1016/j.nimb.2025.165650

Shaobo Ma , Xueheng Zhang , Xincai Kang , Lina Sheng , Zhen Chai , Bo Yang , Wuyuan Li , Haijiao Lu , Zhiguo Xu

{"title":"Principle design of a high-power graphite target for the HFRS separator at HIAF","authors":"Shaobo Ma , Xueheng Zhang , Xincai Kang , Lina Sheng , Zhen Chai , Bo Yang , Wuyuan Li , Haijiao Lu , Zhiguo Xu","doi":"10.1016/j.nimb.2025.165650","DOIUrl":"10.1016/j.nimb.2025.165650","url":null,"abstract":"<div><div>A new generation in-flight radioactive separator named High energy FRagment Separator (HFRS) is currently under construction at the High Intensity heavy-ion Accelerator Facility (HIAF) in China. Designing a high-power production target for this high-intensity separator is a major challenge. This paper gives an overview of the physical requirements for the target, measures the thermophysical parameters of a graphite material, discusses the technical challenges in the thermal and mechanical aspects of the graphite disk using finite element analysis, and proposes a principle design for this high-power graphite target, which employs a radiation-cooled rotating graphite disk. The calculated results show that for a slow extracted uranium beam with a power of 1.59kW and a deposition power of 0.58kW, the designed graphite target was safe in both thermal and mechanical respects. For a fast extracted uranium beam with a maximum power of 9.5kW, when the deposition power in the graphite target is 3.5kW, the thermal stress caused by the propagation of pressure waves is the key parameter in evaluating the safety of the target. Considering the safety margin, the standard deviation of the horizontal and vertical beam spot needs to be increased to 2mm and 3.8mm, respectively, to ensure that the thermal stress is lower than the tensile strength of the graphite material. These results provide references for the future design and operation of the target system of the HFRS separator.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":"562 ","pages":"Article 165650"},"PeriodicalIF":1.4,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143428017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Short-range interactions in the N(4S)H+ and N+ (3P)H(2S) collisions: Cross sections and nuclear stopping power N(4S)H+和N+ (3P)H（2S）碰撞中的短程相互作用：截面和核停止力

IF 1.4 3区物理与天体物理

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms Pub Date : 2025-02-18 DOI: 10.1016/j.nimb.2025.165645

M. Buchowiecki

{"title":"Short-range interactions in the N(4S)H+ and N+ (3P)H(2S) collisions: Cross sections and nuclear stopping power","authors":"M. Buchowiecki","doi":"10.1016/j.nimb.2025.165645","DOIUrl":"10.1016/j.nimb.2025.165645","url":null,"abstract":"<div><div>The interactions between N(<span><math><msup><mrow></mrow><mrow><mn>4</mn></mrow></msup></math></span>S)<img>H<span><math><msup><mrow></mrow><mrow><mo>+</mo></mrow></msup></math></span> and the N<span><math><msup><mrow></mrow><mrow><mo>+</mo></mrow></msup></math></span> (<span><math><msup><mrow></mrow><mrow><mn>3</mn></mrow></msup></math></span>P)<img>H(<sup>2</sup>S) were calculated using the multireference configuration interaction (MRCI) method within the MOLPRO software. This study extends the previous research to short-range distances, reaching <span><math><mrow><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mo>−</mo><mn>3</mn></mrow></msup></mrow></math></span> bohr.</div><div>The results enable an analysis of the extrapolation of the short-range limits of colliding atoms and ions with the <span><math><mrow><mi>a</mi><mo>exp</mo><mrow><mo>(</mo><mo>−</mo><mi>b</mi><mi>r</mi><mo>)</mo></mrow><mo>/</mo><mi>r</mi></mrow></math></span> functional form. It was observed that at the shortest distances, atoms and ions interact with a Coulomb type potential. The high energy integrated cross sections (ICS), transport cross sections and nuclear stopping power (NSP) cross sections were calculated and differences from values derived from extrapolated potentials are discussed. The comparison with the SRIM code is performed.</div><div>Additionally, the long-range behavior of the N(<span><math><msup><mrow></mrow><mrow><mn>4</mn></mrow></msup></math></span>S)<img>H<span><math><msup><mrow></mrow><mrow><mo>+</mo></mrow></msup></math></span> interaction from the previous study was corrected and the effect of neglecting potential energy curves in calculations of NSP cross sections was examined.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":"562 ","pages":"Article 165645"},"PeriodicalIF":1.4,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143428019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A method to detect the VUV photons from cooled 229Th:CaF2 crystals 一种从229:CaF2晶体中探测VUV光子的方法

IF 1.4 3区物理与天体物理

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms Pub Date : 2025-02-18 DOI: 10.1016/j.nimb.2025.165647

Ming Guan , Michael Bartokos , Kjeld Beeks , Yuta Fukunaga , Takahiro Hiraki , Takahiko Masuda , Yuki Miyamoto , Ryoichiro Ogake , Koichi Okai , Noboru Sasao , Fabian Schaden , Thorsten Schumm , Kotaro Shimizu , Sayuri Takatori , Akihiro Yoshimi , Koji Yoshimura

{"title":"A method to detect the VUV photons from cooled 229Th:CaF2 crystals","authors":"Ming Guan , Michael Bartokos , Kjeld Beeks , Yuta Fukunaga , Takahiro Hiraki , Takahiko Masuda , Yuki Miyamoto , Ryoichiro Ogake , Koichi Okai , Noboru Sasao , Fabian Schaden , Thorsten Schumm , Kotaro Shimizu , Sayuri Takatori , Akihiro Yoshimi , Koji Yoshimura","doi":"10.1016/j.nimb.2025.165647","DOIUrl":"10.1016/j.nimb.2025.165647","url":null,"abstract":"<div><div>Thorium-229, with its exceptionally low-energy nuclear excited state, is the only candidate for developing a nuclear clock. <sup>229</sup>Th-doped CaF<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> crystals, benefiting from calcium fluoride’s wide band gap, show great promise as solid-state nuclear clock materials. These crystals are excited by vacuum ultraviolet (VUV) lasers, which over time cause radiation damage. Cooling the crystals can mitigate this damage but introduces a challenge: photoabsorption. This occurs when residual gas molecules condense on the crystal surface, absorbing VUV photons and deteriorating detection efficiency. To solve this, we developed a cooling technique using a copper shield to surround the crystal, acting as a cold trap. This prevents ice-layer formation, even at temperatures below <span><math><mrow><mo>−</mo><mn>100</mn><mspace></mspace><mo>°</mo><mi>C</mi></mrow></math></span>, preserving high VUV photon detection efficiency. Our study detailed the experimental cooling setup and demonstrated the effectiveness of the copper shield in maintaining crystal performance, a critical improvement for future solid-state nuclear clocks operating at cryogenic temperatures.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":"562 ","pages":"Article 165647"},"PeriodicalIF":1.4,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143428020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Scattering effects on X-ray imaging of bubbly flow in metal pipes 金属管道气泡流x射线成像中的散射效应

IF 1.4 3区物理与天体物理

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms Pub Date : 2025-02-18 DOI: 10.1016/j.nimb.2025.165646

Jianxian Song , Hailiang Yang , Pengfei Zhang , Jinhua Wang , Zhiguo Wang , Wuguang Chen , Junlian Yin

引用次数: 0

Background subtraction in inelastic scattering measurements using machine learning 基于机器学习的非弹性散射测量中的背景减法

IF 1.4 3区物理与天体物理

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms Pub Date : 2025-02-17 DOI: 10.1016/j.nimb.2025.165649

R. Ghimire , A. Ratkiewicz , S.D. Pain , K.A. Chipps , J.A. Cizewski , K.L. Jones , P. Bedrossian , S.R. Carmichael , H. Garland , Claus Müller-Gatermann , R.O. Hughes , H. Jayatissa , K. Kolos , J.M. Kovoor , A. Kyle , W. Reviol , A. Richard , N.D. Scielzo , M. Siciliano , H. Sims , S. Zhu

{"title":"Background subtraction in inelastic scattering measurements using machine learning","authors":"R. Ghimire , A. Ratkiewicz , S.D. Pain , K.A. Chipps , J.A. Cizewski , K.L. Jones , P. Bedrossian , S.R. Carmichael , H. Garland , Claus Müller-Gatermann , R.O. Hughes , H. Jayatissa , K. Kolos , J.M. Kovoor , A. Kyle , W. Reviol , A. Richard , N.D. Scielzo , M. Siciliano , H. Sims , S. Zhu","doi":"10.1016/j.nimb.2025.165649","DOIUrl":"10.1016/j.nimb.2025.165649","url":null,"abstract":"<div><div>Identifying, isolating, and subtracting background from the signal of interest is vital for nuclear physics experiments. These backgrounds introduce unwanted uncertainties that must be accounted for properly to extract accurate results from the signals. In nuclear reaction measurements, the typical contaminants are carbon and oxygen, contributing to background signals, and complicating the measurement of the light ejectiles. For instance, in the inelastic scattering measurement of a 20.9-MeV proton beam on <sup>96</sup>Mo, the <sup>96</sup>Mo target was contaminated with carbon and oxygen. We used random forest, a machine learning algorithm commonly used for classification and regression tasks, to separate the inelastic scattering on the carbon and oxygen contaminants from the data of interest resulting from <sup>96</sup>Mo(<span><math><mrow><mi>p</mi><mo>,</mo><msup><mrow><mi>p</mi></mrow><mrow><mo>′</mo></mrow></msup></mrow></math></span>).</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":"561 ","pages":"Article 165649"},"PeriodicalIF":1.4,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419409","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Damage and degradation region of GaN HEMTs induced by different radiation effects 不同辐射效应对GaN hemt损伤及降解区域的影响

IF 1.4 3区物理与天体物理

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms Pub Date : 2025-02-11 DOI: 10.1016/j.nimb.2025.165635

Qi-Yao Wang, Ying Wang, Jun Liu, Wen-jun Li, Cheng-hao Yu, Hao-min Guo

引用次数: 0