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

{"title":"Electron inelastic mean free paths in a group of bioorganic compounds and liquid water over the energy range of 20–20,000 eV","authors":"Zhenyu Tan,&nbsp;Yadi Liu","doi":"10.1016/j.nimb.2025.165781","DOIUrl":"10.1016/j.nimb.2025.165781","url":null,"abstract":"<div><div>We have carried out the systematic calculations of inelastic mean free paths (IMFPs) of energetic electrons in seven bioorganic compounds (Adenine, Guanine, Thymine, Cytosine, Uracil, DNA, and Protein) and liquid water in the energy range from 20 eV to 20 keV. The calculations are based on our previous optical-data model with the Born–Ochkur exchange correction, but a combinational second-order perturbation correction is introduced into this model and the energy gap is accounted for in the present work. The introduced second-order perturbation correction includes the two parts, one is the correction due to the Barkas effect and the other is called the pseudo-Coulomb-field correction proposed heuristically. The two corrections are implemented respectively in the range above and below a characteristic energy. We have compared our calculated IMFPs for the considered compounds with other theoretical evaluations of IMFP. The comparisons reveal the significant effects of the introduced second-order correction on the IMFP calculations at energies below 200 eV and meanwhile show good agreement between all the theoretically evaluated IMFPs above about 300 eV. The presented calculation data provide the useful and alternative IMFPs for the bioorganic compounds under consideration and liquid water in the study of radiation biological effects.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":"566 ","pages":"Article 165781"},"PeriodicalIF":1.4,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144481732","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}

{"title":"Assessing the near-surface diffusion of Xe and Kr in Zirconia by time-of-flight elastic recoil detection analysis","authors":"N. Wikström ,&nbsp;M. Giamouridou ,&nbsp;E. Charatsidou ,&nbsp;P. Olsson ,&nbsp;J. Oscarsson ,&nbsp;D. Primetzhofer ,&nbsp;R.J.W. Frost","doi":"10.1016/j.nimb.2025.165773","DOIUrl":"10.1016/j.nimb.2025.165773","url":null,"abstract":"<div><div>The diffusion of two volatile fission products, xenon (Xe) and krypton (Kr), in zirconia (ZrO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>) is investigated. Samples of Yttria (Y<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>O<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span>)-stabilised tetragonal ZrO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> were implanted with either Xe or Kr, at 300 keV, with a fluence of 10¹⁷ at./cm<span><math><msup><mrow></mrow><mrow><mn>2</mn></mrow></msup></math></span>, and subsequently analysed with time-of-flight elastic recoil detection analysis (ToF-ERDA) to obtain elemental composition depth profiles. Samples were then annealed at 1200 °C for 9 h, and the effect of the annealing was assessed by ToF-ERDA measurements. From these measurements, first-order approximations of diffusion coefficients for Xe and Kr in ZrO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> were derived, using a model based on Fick’s second law, these being <span><math><mrow><mrow><mo>(</mo><mn>1</mn><mo>.</mo><mn>36</mn><mo>±</mo><mn>0</mn><mo>.</mo><mn>87</mn><mo>)</mo></mrow><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mo>−</mo><mn>19</mn></mrow></msup></mrow></math></span> m<span><math><msup><mrow></mrow><mrow><mn>2</mn></mrow></msup></math></span>/s and <span><math><mrow><mrow><mo>(</mo><mn>2</mn><mo>.</mo><mn>94</mn><mo>±</mo><mn>1</mn><mo>.</mo><mn>96</mn><mo>)</mo></mrow><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mo>−</mo><mn>19</mn></mrow></msup></mrow></math></span> m<span><math><msup><mrow></mrow><mrow><mn>2</mn></mrow></msup></math></span>/s at 1200 °C for Kr and Xe respectively. It was shown that ToF-ERDA can provide data to analyse the diffusion of elements in solid sample matrices and that a model based on Fick’s Law can predict the diffusion of the implanted ions.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":"566 ","pages":"Article 165773"},"PeriodicalIF":1.4,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144472123","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}

{"title":"Study of surfaces of insulating materials by near-edge X-ray absorption fine structure spectroscopy in total-electron-yield mode","authors":"Eiichi Kobayashi ,&nbsp;Osamu Takahashi ,&nbsp;Kyoko K. Bando ,&nbsp;Koji K. Okudaira ,&nbsp;Satoru Yoshioka","doi":"10.1016/j.nimb.2025.165779","DOIUrl":"10.1016/j.nimb.2025.165779","url":null,"abstract":"<div><div>We analyzed the surfaces of insulating materials using near-edge X-ray absorption fine structure (NEXAFS) spectroscopy in total-electron-yield (TEY) mode. Conventionally, insulating materials such as glass and ceramics prepared for NEXAFS analysis by the TEY method are ground and fixed in a sample holder to avoid charging. However, this method is not suitable for analysis of chemically treated surfaces because of surface contamination and changes in the chemical state or structure of the sample. Therefore, by placing a gold mesh on the sample surface, we obtained a normal spectrum without surface contamination and without the effects of charge-up. A comparison with theoretical calculations revealed that OH groups are mainly adsorbed onto the insulator surface exposed to the atmosphere.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":"566 ","pages":"Article 165779"},"PeriodicalIF":1.4,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144472122","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}

{"title":"A note on extracting electronic stopping powers of solid matter for heavy ions from energy loss spectra recorded in transmission geometry","authors":"Kevin Vomschee ,&nbsp;Radek Holeňák ,&nbsp;Thanush Sivagnanalingam ,&nbsp;Eleni Ntemou ,&nbsp;Daniel Primetzhofer","doi":"10.1016/j.nimb.2025.165772","DOIUrl":"10.1016/j.nimb.2025.165772","url":null,"abstract":"<div><div>We describe and compare two techniques to extract the electronic stopping power of solid materials for energetic ions from energy loss spectra recorded in transmission geometry. Particular attention is attributed to the contribution of the nuclear energy loss to the total energy loss. Energy loss spectra were measured for slow N⁺ and Ar⁺ projectiles transmitted through 200 nm (N⁺ projectile) and 50 nm (Ar⁺ projectile) thick SiC membranes. The measured energy losses are successfully separated into electronic and nuclear losses with the help of a Binary Collision Approximation (BCA) code. The simulations show that the nuclear stopping power in any forward scattering geometry strongly deviates from SRIM predictions. Electronic stopping powers are calculated by two different iterative processes, yielding electronic stopping power at the mean energy or the energy for the mean stopping. The accuracy of the electronic stopping functions gained from these methods is verified by controlling whether the BCA code predicts the measured energy losses correctly using these functions for the simulated electronic stopping power. We show that both algorithms are suitable for extracting the electronic stopping power, even if it shows a pronounced non-linear energy dependence and if the contribution from elastic scattering to the energy loss is large. We compare their performance and show that simultaneous iteration of the electronic and nuclear stopping power provides the most accurate results.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":"566 ","pages":"Article 165772"},"PeriodicalIF":1.4,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144365766","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}

{"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 ,&nbsp;John A. Eliades ,&nbsp;Minyoung Kim ,&nbsp;Gwan-Ho Lee ,&nbsp;Hiroyuki Matsazuki ,&nbsp;Barbara Francisco ,&nbsp;Joonkon Kim ,&nbsp;Byung-Yong Yu ,&nbsp;Changmin Sung ,&nbsp;Seora Seo ,&nbsp;Weoncheol Lim ,&nbsp;Seongeun Song ,&nbsp;Bogyong Kim ,&nbsp;Sunwoo Moon","doi":"10.1016/j.nimb.2025.165776","DOIUrl":"10.1016/j.nimb.2025.165776","url":null,"abstract":"<div><div>Studies for ¹²⁹I analysis by accelerator mass spectrometry (AMS) are presented. Alpha Aesar KI product 10978 (99.995 % purity) was measured to have ¹²⁹I/¹²⁷I = 1.6x10^-14, 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 &gt; 80 % extraction yield. An “iodine carrier-free” extraction method, co-precipitating other halides native to the seawater as carriers, was found to have &gt; 98 % extraction yield. Results of seawater ¹²⁹I concentrations measured at 3 AMS laboratories averaged 10 % agreement, similar to the last comparison 20 years ago. Conversely, ¹²⁷I concentrations measured by ICP-MS were in good agreement between only two laboratories. Seawater ¹²⁷I 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 ¹²⁷I 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}

{"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 ,&nbsp;A. Boubir ,&nbsp;M. Salhi ,&nbsp;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 (SiO₂) thin films irradiated by 30 MeV Cl^q+, 40 MeV Au^q+ and 50 MeV Cu^q+ 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^q+ 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}

{"title":"Exploration of alternative gate dielectric materials for RADFET sensors","authors":"E. Amat ,&nbsp;C. Martínez-Domingo ,&nbsp;C. Fleta ,&nbsp;M. Mas-Torrent ,&nbsp;M. Lozano","doi":"10.1016/j.nimb.2025.165775","DOIUrl":"10.1016/j.nimb.2025.165775","url":null,"abstract":"<div><div>RADFETs are a low-cost option for implementing a radiation sensor. The characteristics of their gate dielectric material is the key element due to its sensitivity to ionizing radiation. We have studied alternative (high-K and organic) materials to the conventional SiO₂-based gate dielectric in order to improve the device performance. Electrical characterization in irradiated samples has been carried on to study the radiation response of each material to low levels of ionizing radiation. The HfO₂-based samples have a much higher sensitivity per unit thickness than the SiO₂-based ones. High-K based RADFETs show promising performance as gate dielectrics for future silicon based radiation sensors.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":"566 ","pages":"Article 165775"},"PeriodicalIF":1.4,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144291583","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}

{"title":"Preface: Proceedings of the Joint 26th International Conference on Ion Beam Analysis and 18th International Conference on Particle Induced X-ray Emission (IBA&PIXE 2023)","authors":"Tokihiro Ikeda,&nbsp;Markus Wilde,&nbsp;Mitsunori Kurahashi,&nbsp;Manabu Saito,&nbsp;Yuuko Fukazawa,&nbsp;Masanori Koshimizu,&nbsp;Shinichi Yamashita","doi":"10.1016/j.nimb.2025.165774","DOIUrl":"10.1016/j.nimb.2025.165774","url":null,"abstract":"","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":"566 ","pages":"Article 165774"},"PeriodicalIF":1.4,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144680693","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}

{"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 ,&nbsp;Q. Besnard ,&nbsp;V. Blideanu ,&nbsp;K.Al Khouri ,&nbsp;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}

{"title":"Rapid energy calibration of MeV proton beams through resonant backscattering and the analysis tool RACE-p","authors":"Huanlu Xue,&nbsp;Yu Zhang,&nbsp;Wei Zhang,&nbsp;Jie Ma,&nbsp;Jiahao Xu,&nbsp;Hao Shen,&nbsp;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}