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

129I analysis of seawater at KIST: Carrier and carrier-free extraction techniques, an inter-laboratory comparison of results, and an alternative to ICP-MS 127I concentration measurements KIST海水的129I分析：载体和无载体提取技术，实验室间结果比较，以及ICP-MS 127I浓度测量的替代方法

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 : 2025-06-19 DOI: 10.1016/j.nimb.2025.165776

Min-Seok Oh , John A. Eliades , Minyoung Kim , Gwan-Ho Lee , Hiroyuki Matsazuki , Barbara Francisco , Joonkon Kim , Byung-Yong Yu , Changmin Sung , Seora Seo , Weoncheol Lim , Seongeun Song , Bogyong Kim , Sunwoo Moon

{"title":"129I analysis of seawater at KIST: Carrier and carrier-free extraction techniques, an inter-laboratory comparison of results, and an alternative to ICP-MS 127I concentration measurements","authors":"Min-Seok Oh , John A. Eliades , Minyoung Kim , Gwan-Ho Lee , Hiroyuki Matsazuki , Barbara Francisco , Joonkon Kim , Byung-Yong Yu , Changmin Sung , Seora Seo , Weoncheol Lim , Seongeun Song , Bogyong Kim , Sunwoo Moon","doi":"10.1016/j.nimb.2025.165776","DOIUrl":"10.1016/j.nimb.2025.165776","url":null,"abstract":"<div><div>Studies for <sup>129</sup>I analysis by accelerator mass spectrometry (AMS) are presented. Alpha Aesar KI product 10978 (99.995 % purity) was measured to have <sup>129</sup>I/<sup>127</sup>I = 1.6x10<sup>-14</sup>, suitable for use as carrier and background material. Iodine extraction from seawater using chloroform and n-hexane with iodine carrier showed hexane to have advantages and > 80 % extraction yield. An “iodine carrier-free” extraction method, co-precipitating other halides native to the seawater as carriers, was found to have > 98 % extraction yield. Results of seawater <sup>129</sup>I concentrations measured at 3 AMS laboratories averaged 10 % agreement, similar to the last comparison 20 years ago. Conversely, <sup>127</sup>I concentrations measured by ICP-MS were in good agreement between only two laboratories. Seawater <sup>127</sup>I concentrations calculated from AMS results for samples treated using both carrier and carrier-free methods were in agreement with ICP-MS measurements, suggesting an alternative for <sup>127</sup>I concentration measurements. Data for 8 Korean coastal seawater samples are also presented.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":"566 ","pages":"Article 165776"},"PeriodicalIF":1.4,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144313721","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

Three-dimensional thermal-spike modeling of ion charge-state dependence on sputtering yield in silicon dioxide thin films under MeV heavy-ion irradiation MeV重离子辐照下二氧化硅薄膜中离子电荷态与溅射成品率关系的三维热尖峰模型

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 : 2025-06-19 DOI: 10.1016/j.nimb.2025.165780

S. Mammeri , A. Boubir , M. Salhi , M. Saad

{"title":"Three-dimensional thermal-spike modeling of ion charge-state dependence on sputtering yield in silicon dioxide thin films under MeV heavy-ion irradiation","authors":"S. Mammeri , A. Boubir , M. Salhi , M. Saad","doi":"10.1016/j.nimb.2025.165780","DOIUrl":"10.1016/j.nimb.2025.165780","url":null,"abstract":"<div><div>The influence of ion charge-state effects on the induced sputtering in silicon dioxide (SiO<sub>2</sub>) thin films irradiated by 30 MeV Cl<sup>q+</sup>, 40 MeV Au<sup>q+</sup> and 50 MeV Cu<sup>q+</sup> heavy ions was investigated numerically using the inelastic thermal spike (i-TS) model extended to 3-dimensions. An improved numerical approach using a cylindrical geometry was used to simulate the heat transfer from electronic to lattice subsystems by varying the ion charge-state. The obtained numerical profiles of electronic and atomic temperatures revealed more significant ion charge-state effects close to the center of the formed latent-track and near the surface up to deeper depths of 25 nm. The extracted numerical track-radii revealed small variations (of ∼1.9 to ∼9.9 %) for lower depths up to 25 nm. Then, they reached a mean track-value (around ∼3.9 nm in case of 40 MeV Au<sup>q+</sup> ions) corresponding to charge equilibrium, for which, a good agreement was found with the available experimental track-data. The obtained numerical sputtering yields versus penetration depth were finally found to predict better the non-equilibrium to equilibrium sputtering yield ratios, when they were compared to the available experimental data. Adequate mean depths (of ∼10 to ∼15 nm) corresponding to depth at origin of sputtered particles were estimated via i-TS calculation, equivalent to that (of ∼17 nm) previously evaluated from empirical scaling laws of ion mean-charge.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":"566 ","pages":"Article 165780"},"PeriodicalIF":1.4,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144313722","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

Exploration of alternative gate dielectric materials for RADFET sensors RADFET传感器栅极介电材料的探索

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 : 2025-06-16 DOI: 10.1016/j.nimb.2025.165775

E. Amat , C. Martínez-Domingo , C. Fleta , M. Mas-Torrent , M. Lozano

引用次数: 0

Experimental data-driven modeling and prediction of (γ,n) cross-sections with physics-informed neural networks and gradient boosted decision trees 实验数据驱动的（γ,n）截面建模和预测与物理信息的神经网络和梯度增强决策树

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 : 2025-06-11 DOI: 10.1016/j.nimb.2025.165771

C. Besnard-Vauterin , Q. Besnard , V. Blideanu , K.Al Khouri , M. Bony

{"title":"Experimental data-driven modeling and prediction of (γ,n) cross-sections with physics-informed neural networks and gradient boosted decision trees","authors":"C. Besnard-Vauterin , Q. Besnard , V. Blideanu , K.Al Khouri , M. Bony","doi":"10.1016/j.nimb.2025.165771","DOIUrl":"10.1016/j.nimb.2025.165771","url":null,"abstract":"<div><div>In this study, we present a hybrid machine learning framework for modeling and predicting (γ,n) reaction cross sections across the nuclear chart, combining physical interpretability with predictive power. The first stage uses a Physics-Informed Neural Network (PINN) to fit experimental data from EXFOR while enforcing domain-specific constraints, such as energy thresholds, Lorentzian resonance behavior, and monotonicity beyond the Giant Dipole Resonance (GDR). These high-quality fits are then used to train a Gradient Boosted Decision Tree (GBDT) model on a broad set of nuclear features including mass, shell effects, separation energies, and deformation parameters. The resulting model agrees well with both experimental and evaluated data for known isotopes and extrapolates plausibly to exotic nuclides lacking measurements. Case studies on stable isotopes, actinides, and neutron-rich nuclei demonstrate the model’s robustness. This approach illustrates the complementarity of physics-informed and data-driven modeling for improving cross-section coverage in nuclear physics, simulation, and security applications.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":"566 ","pages":"Article 165771"},"PeriodicalIF":1.4,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144263377","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

Rapid energy calibration of MeV proton beams through resonant backscattering and the analysis tool RACE-p 通过共振后向散射和RACE-p分析工具快速标定MeV质子束能量

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 : 2025-06-07 DOI: 10.1016/j.nimb.2025.165762

Huanlu Xue, Yu Zhang, Wei Zhang, Jie Ma, Jiahao Xu, Hao Shen, Zhaohong Mi

{"title":"Rapid energy calibration of MeV proton beams through resonant backscattering and the analysis tool RACE-p","authors":"Huanlu Xue, Yu Zhang, Wei Zhang, Jie Ma, Jiahao Xu, Hao Shen, Zhaohong Mi","doi":"10.1016/j.nimb.2025.165762","DOIUrl":"10.1016/j.nimb.2025.165762","url":null,"abstract":"<div><div>Accurate energy calibration of MeV proton beams is critical for ion beam analysis techniques, yet conventional methods relying on nuclear reactions face limitations in accessibility and efficiency. This study presents a rapid calibration protocol using non-Rutherford resonance backscattering from graphite and Mylar film samples. By analyzing saddle-point features in backscattering spectra, the calibration factor R (ratio of peak areas) is introduced to mitigate beam current instability. A self-developed software RACE-p enables automated batch processing of spectra, reducing analysis time from several hours manually to just a few minutes. Experimental results revealed consistent energy deviations of 31.4 keV (graphite) and 30.8 keV (Mylar), validated by improved fitting accuracy post-calibration. This method offers a standardized and efficient solution for MeV proton beam energy calibration in ion accelerator facilities. The integration of RACE-p enhances analytical reliability and throughput in proton beam energy calibration for applications in materials science and nuclear physics.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":"566 ","pages":"Article 165762"},"PeriodicalIF":1.4,"publicationDate":"2025-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144229609","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

Online and in situ investigation of electron irradiation induced optical absorption in ZnGeP2 single crystals 电子辐照诱导ZnGeP2单晶光吸收的在线和原位研究

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 : 2025-06-04 DOI: 10.1016/j.nimb.2025.165758

Charlotte Vernozy , Antonino Alessi , Olivier Cavani , Audrey Courpron , Johan Petit , Valérie Véniard

{"title":"Online and in situ investigation of electron irradiation induced optical absorption in ZnGeP2 single crystals","authors":"Charlotte Vernozy , Antonino Alessi , Olivier Cavani , Audrey Courpron , Johan Petit , Valérie Véniard","doi":"10.1016/j.nimb.2025.165758","DOIUrl":"10.1016/j.nimb.2025.165758","url":null,"abstract":"<div><div>In the present study, the absorbance induced in Zinc germanium diphosphide, ZnGeP<sub>2</sub> (ZGP) crystals and new Sn-doped ZGP crystals has been investigated under irradiation with high energy electrons. Online and in situ experiments were performed in the range 720–1100 nm. The spectra of the induced absorbance are constituted by a “tail” and the maximum appears to be located at wavelengths lower than those of the investigated spectral range. A fraction of the induced absorbance disappears within one minute after the electron beam is switched off, revealing the presence of metastable effects. A low and a high fluence contribution to the induced absorbance have been observed at 800 nm. The first reaches a limit value and seems to be affected by the Sn doping or by the absence of post-growth annealing, while the high fluence contribution does not feature a saturation in the investigated range and does not depend on the sample type.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":"566 ","pages":"Article 165758"},"PeriodicalIF":1.4,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144204644","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

Study on the relationship between magnetic uniform field range and key mechanical size in electromagnetic separation 电磁分选过程中磁场均匀范围与关键机械尺寸关系的研究

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 : 2025-06-04 DOI: 10.1016/j.nimb.2025.165761

Tian Yaqi, Ren Xiuyan, Wu Dan, Yuan Bo

{"title":"Study on the relationship between magnetic uniform field range and key mechanical size in electromagnetic separation","authors":"Tian Yaqi, Ren Xiuyan, Wu Dan, Yuan Bo","doi":"10.1016/j.nimb.2025.165761","DOIUrl":"10.1016/j.nimb.2025.165761","url":null,"abstract":"<div><div>Currently, the production of stable isotopes in high abundance primarily relies on electromagnetic separation methods. This approach necessitates the design of a uniform magnetic field of high quality. The extent of this uniform field depends on the particle deflection radius and divergence angle. Although determining this area is straightforward, ensuring its uniformity during the design of electromagnetic separation equipment poses significant challenges. Designing the mechanical dimensions of the pole shoe often requires extensive software simulations, theoretical calculations, and even experimental validations. This process can be complex and demanding. Poor selection and assessment during the design phase may result in failure to meet performance metrics or cause substantial increases in construction costs. This paper discusses the use of extensive software simulation data to analyze and summarize the relationship between the uniform field extent in the analysis magnet and the critical mechanical dimensions of the pole shoe. Verification through two existing electromagnetic separation devices will support the credibility of the findings, thus establishing a foundation for future projects that focus on the mechanical size design of uniform magnetic fields and offering theoretical guidance. This approach significantly alleviates design difficulties.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":"566 ","pages":"Article 165761"},"PeriodicalIF":1.4,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144205050","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

Structural and mechanical properties of titanium nitride films modulated by assisting ions 辅助离子调制氮化钛薄膜的结构和力学性能

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 : 2025-06-04 DOI: 10.1016/j.nimb.2025.165756

Lili Geng , Meichen Wu , Jiayi Guo , Junhao Wan , Fanya Jin , Zhaotan Jiang , Zhi Wang

引用次数: 0

Survey of naturally occurring 236U with direct-AMS 直接- ams法测定自然产236U

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 : 2025-06-03 DOI: 10.1016/j.nimb.2025.165763

X.-L. Zhao , B.B.A. Francisco

{"title":"Survey of naturally occurring 236U with direct-AMS","authors":"X.-L. Zhao , B.B.A. Francisco","doi":"10.1016/j.nimb.2025.165763","DOIUrl":"10.1016/j.nimb.2025.165763","url":null,"abstract":"<div><div>From a multi-isotope direct-AMS survey of 310 uranium ore concentrates (UOCs), <sup>236</sup>U/<sup>238</sup>U ratios from ∼2 × 10<sup>−12</sup> to ∼2 × 10<sup>−7</sup> are measured. However, a range from low-10<sup>−12</sup> to mid-10<sup>−10</sup> is expected from directly mined natural uranium ore minerals. This upper-end discrepancy would normally be attributed to inputs of spent fuel materials, but the numerous occurrences and the lack of economic reasons to recycle anything in the front stage of UOC production make the abnormally high <sup>236</sup>U/<sup>238</sup>U ratios rather perplexing. When plotted against the <sup>187</sup>Os/<sup>188</sup>Os ratios, which were also obtained in the survey, the high <sup>236</sup>U/<sup>238</sup>U results are seen to occur around the value of <sup>187</sup>Os/<sup>188</sup>Os ∼10, a non-random pattern as might be anticipated from unwitting contaminations. This observed correlation favors those measured high <sup>236</sup>U/<sup>238</sup>U ratios being natural, and as such, it refers to an overlooked natural <sup>238</sup>U/<sup>235</sup>U isotope fraction mechanism. Therefore, this work calls for further studies of naturally occurring <sup>236</sup>U/<sup>238</sup>U in a wider range of native uranium-bearing minerals. To secure unambiguous natural <sup>236</sup>U surveys, an approach is described that combines UF<sub>5</sub><sup>−</sup> production directly from powdered native samples and ion source reconfiguration to minimize background.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":"566 ","pages":"Article 165763"},"PeriodicalIF":1.4,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144204643","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

Stopping power and energy loss straggling data of 0.6–4.4 MeV H+ and He2+ swift ions in bismuth thin films: Influence of Heq+ ion charge-state effects 铋薄膜中0.6-4.4 MeV H+和He2+快离子的停止功率和能量损失漂移数据：Heq+离子荷态效应的影响

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 : 2025-06-02 DOI: 10.1016/j.nimb.2025.165757

S. Mammeri , C. Mtshali , M. Nkosi

{"title":"Stopping power and energy loss straggling data of 0.6–4.4 MeV H+ and He2+ swift ions in bismuth thin films: Influence of Heq+ ion charge-state effects","authors":"S. Mammeri , C. Mtshali , M. Nkosi","doi":"10.1016/j.nimb.2025.165757","DOIUrl":"10.1016/j.nimb.2025.165757","url":null,"abstract":"<div><div>The stopping power and energy-loss straggling of H<sup>+</sup> and He<sup>2+</sup> swift ions in bismuth (Bi) thin film were investigated for a wide energy range from 0.6 to 4.4 MeV. The measurements were performed in a backscattering geometry for ∼ 120 nm Bi-films on silicon substrate with a very thin interface layer of copper deposited by electron-beam evaporation. The obtained stopping results were first compared to previous data available for the two ion-target systems (H<sup>+</sup>-Bi, He<sup>+</sup>-Bi), and again to numerical values generated by three different computer codes of SRIM-2013, PASS-2.0 and CasP-6.0. While those of energy-loss straggling were compared to some previous data available for the above two ion-target systems and to collisional straggling values derived by Bohr’s and Bethe-Livingston’s classical theories. The whole straggling data were then compared to numerical values generated by Yang et al.’s semi-empirical formula recently refined to account new experimental data. The influence of He<sup>q+</sup>-ion charge-state and related charge-exchange effects on the measured stopping and straggling data was then discussed, and finally completed by comparison with the analytical charge-exchange formula of Efken et al. limited to just two ion charge-states q of + 1 and + 2.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":"566 ","pages":"Article 165757"},"PeriodicalIF":1.4,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144195489","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