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

{"title":"Development of a facility for X-ray absorption fine-structure spectroscopy of radioactive samples at Indus-2 synchrotron radiation source, India","authors":"Sumit Kumar ,&nbsp;Neetika Rawat ,&nbsp;S.C. Parida ,&nbsp;D. Bhattacharya ,&nbsp;S. Jeyakumar ,&nbsp;Rajashri Urkude ,&nbsp;Ankur Agrawal ,&nbsp;Biplab Ghosh ,&nbsp;Tapas Ganguli ,&nbsp;G. Haridas","doi":"10.1016/j.nimb.2025.165857","DOIUrl":"10.1016/j.nimb.2025.165857","url":null,"abstract":"<div><div>We report on the development of an experimental facility dedicated to X-ray absorption fine-structure measurement of actinides and other α- and β- decaying non-sealed radioactive samples at Scanning EXAFS beamline (BL − 09), Indus-2 synchrotron source operated by Raja Ramanna Centre for Advance Technology, Indore. This facility is designed with the idea that samples remain confined in the event of failure of one or two of the containments and the accidental radiation exposure scenario do not happen. It employs an under-pressurized glove box with controlled ventilation scheme, air-filter and radiation monitoring in place. A detailed structural description of the facility, of allowed measurement geometry, permissible radionuclides’ limit and the radioprotection provisions of the facility are presented herein. The performance of the setup was tested with the room temperature Pu <em>L₃</em> edge EXAFS measurement of Plutonium Sulphate (K₄Pu(SO₄)₄·2H₂O). The Pu-O bond distance obtained by fitting of the EXAFS data was found comparable to that obtained from the Rietveld refinement of the powder X-ray diffraction data of the salt. This facility provides elaborate safety and measurement capability for radioactive samples to synchrotron-based EXAFS users and aims to aid in the fundamental and applied research of actinides and other long-lived alpha and beta active radioisotopes.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":"568 ","pages":"Article 165857"},"PeriodicalIF":1.4,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145019430","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":"Ion irradiation of reduced graphene oxide for near-infrared photodetector applications","authors":"Chetan Awasthi ,&nbsp;Firoz Khan ,&nbsp;R. Meena ,&nbsp;Asokan Kandasami ,&nbsp;S.S. Islam","doi":"10.1016/j.nimb.2025.165858","DOIUrl":"10.1016/j.nimb.2025.165858","url":null,"abstract":"<div><div>Due to rapid technological advancements, NIR photodetectors are utilized in various domains, including tracking brain activity, heartbeats, night vision, deep tissue imaging, smart wearables, enabling fast internet, monitoring the planet from space, and other similar applications. In recent years, graphene and its derivatives, such as reduced graphene oxide (RGO), have been considered a good choice due to defect-state transitions and tunability. In this work, we report for the first time the photodetection efficiency in an optical sensor through ion beam exposure of pristine RGO films. Ion irradiation induces structural changes and tunes the photoresponse of the RGO films. Here, 100 MeV Ni-irradiated RGO films show the highest photoresponse with optimal fluences in the range 1 × 10¹¹ to 5 × 10¹¹ ions/cm². This work highlights the potential of ion irradiation as a versatile tool for modifying 2-D material properties, with significant implications for RGO-based photodetectors, optoelectronic devices, and sensors, and paves the way for future research in this field, enabling the development of high-performance devices.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":"568 ","pages":"Article 165858"},"PeriodicalIF":1.4,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145019432","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":"Restoration of cooling water quality in a stand-alone accelerator facility","authors":"P. Steier,&nbsp;D. Baumgartner,&nbsp;M. Martschini,&nbsp;A. Priller,&nbsp;L. Unterweger,&nbsp;A. Wiederin","doi":"10.1016/j.nimb.2025.165846","DOIUrl":"10.1016/j.nimb.2025.165846","url":null,"abstract":"<div><div>Cooling water quality is crucial for the reliable operation of accelerator mass spectrometry (AMS) instruments and particle accelerators. This paper describes the improvement of cooling water quality at the VERA facility, a stand-alone AMS installation at the University of Vienna. Inadequate quality had led to significant operational issues, including blockages in magnet coils. This paper details the restoration efforts, including system modifications and ongoing water quality management practices, aimed at ensuring long-term system stability.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":"568 ","pages":"Article 165846"},"PeriodicalIF":1.4,"publicationDate":"2025-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145004627","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":"Latent tracks induced by swift heavy ions in Gallium nitride","authors":"P.P. Hu ,&nbsp;Z.N. Jin ,&nbsp;L.J. Xu ,&nbsp;S.X. Zhang ,&nbsp;P.F. Zhai ,&nbsp;J. Zeng ,&nbsp;Z.Z. Li ,&nbsp;X.Y. Yan ,&nbsp;L. Cai ,&nbsp;J. Liu","doi":"10.1016/j.nimb.2025.165855","DOIUrl":"10.1016/j.nimb.2025.165855","url":null,"abstract":"<div><div>The amorphous latent tracks in Gallium nitride (GaN) single crystal irradiated with different swift heavy ions (SHIs, ¹²⁹Xe, ¹⁸¹Ta and ²⁰⁹Bi ions) were investigated by transmission electron microscopy (TEM). TEM images showed that the average diameter of latent tracks increased from 1.6 to 4.5 nm with electronic energy loss values increasing from 23 to 46.9 keV/nm. The energy loss threshold for latent track formation in GaN was about 23 keV/nm for 4–17 MeV/u heavy ions concluded from experimental data. The annealing effect of exposuring latent tracks to electron beam was observed. It indicates that GaN crystals have strong recrystallization ability.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":"568 ","pages":"Article 165855"},"PeriodicalIF":1.4,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144989016","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":"Progress in 236U analysis with the compact AMS system at CIAE","authors":"Jianliang Li,&nbsp;Qingzhang Zhao,&nbsp;Ming He,&nbsp;Chengli Xiu,&nbsp;Wenhui Zhang,&nbsp;Yiwen Bao,&nbsp;Kangning Li,&nbsp;Shengyong Su,&nbsp;Wei Guo","doi":"10.1016/j.nimb.2025.165845","DOIUrl":"10.1016/j.nimb.2025.165845","url":null,"abstract":"<div><div>The long-lived radionuclide ²³⁶U has become a powerful tracer in geochemical and oceanographic studies in recent years. Therefore, the present study is carried out to analyse ²³⁶U and other U-isotopes with the compact accelerator mass spectrometry (AMS) system independently developed by the China Institute of Atomic Energy (CIAE). Through the optimization study of beam transmission, particle detection and background suppression techniques, the ²³⁶U measurement method is established and the measurement performance is evaluated. The abundance sensitivity of ²³⁶U/²³⁸U is close to 10^-15 and the effects of various factors such as slit settings are discussed. The results show that the CIAE compact AMS system is capable of rapid, stable, and highly sensitive analysis of uranium samples under low-energy conditions.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":"568 ","pages":"Article 165845"},"PeriodicalIF":1.4,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144989015","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":"K-shell X-ray production cross sections of symmetric and near-symmetric systems of MeV Cu-ion-irradiated Ti, Fe, Ni and Cu thick targets","authors":"J. Hussain ,&nbsp;L.D. Yu ,&nbsp;I. Ahmad ,&nbsp;S. Ullah ,&nbsp;U. Tippawan","doi":"10.1016/j.nimb.2025.165833","DOIUrl":"10.1016/j.nimb.2025.165833","url":null,"abstract":"<div><div>This study aimed to determine the X-ray production cross sections (XPCSs) resulting from heavy Cu-ion irradiation of Ti, Fe, Ni, and Cu, forming symmetric and near-symmetric systems (<em>Z</em>₁ ∼ <em>Z</em>₂ systems). The Cu-ion energy ranged from 2 MeV to 8 MeV (31 keV/u to 125 keV/u), placing the study within the molecular orbital (MO) scheme zone. The data obtained under these conditions would allow for advancements in MeV heavy-ion analyses, particularly given the scarcity of comprehensive data using the thick sample formalism. The measurements were based on the Merzbacher-Lewis relation principle. Shifts and broadening of the K-shell X-ray peaks particularly at higher ion energy were observed, demonstrating multiple ionization (MI). The measured XPCSs were compared with theoretical predictions, showing generally closer alignments with the PWBA (plane wave Bohr approximation) predictions. Based on PWBA, MO, MI, electron capture (EC) and equilibrium charge state (ECS) effects were analyzed and discussed.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":"568 ","pages":"Article 165833"},"PeriodicalIF":1.4,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144921421","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":"Terminal voltage calibration of a 3 MV Tandetron accelerator at Sichuan University, China","authors":"D.H. Xie ,&nbsp;Y. Tang ,&nbsp;T.Y. Jiao ,&nbsp;Z. An ,&nbsp;F. Bai ,&nbsp;X. Fang ,&nbsp;Y.H. Fan ,&nbsp;Y.X. Fan ,&nbsp;B.S. Gao ,&nbsp;J.F. Han ,&nbsp;B. Li ,&nbsp;G. Liu ,&nbsp;W.P. Lin ,&nbsp;J.H. Tan ,&nbsp;X.D. Tang ,&nbsp;C. Wen ,&nbsp;P. Wang ,&nbsp;Q. Wang","doi":"10.1016/j.nimb.2025.165829","DOIUrl":"10.1016/j.nimb.2025.165829","url":null,"abstract":"<div><div>The 3 MV Tandetron accelerator at Sichuan University has been calibrated across a wider terminal voltage range (500–2100 kV), employing the narrow resonance of the ¹³C(<span><math><mrow><mi>α</mi><mo>,</mo><mi>n</mi></mrow></math></span>)¹⁶O reaction along with neutron threshold measurements from ⁷Li(<span><math><mrow><mi>p</mi><mo>,</mo><mi>n</mi></mrow></math></span>)⁷Be, ¹³C(<span><math><mrow><mi>p</mi><mo>,</mo><mi>n</mi></mrow></math></span>)¹³N, and ¹⁹F(<span><math><mrow><mi>p</mi><mo>,</mo><mi>n</mi></mrow></math></span>)¹⁹Ne reactions. The calibration demonstrates excellent reproducibility of energy measurements over a two-year period, with about 0.12 keV variation in repeated measurements at <span><math><mrow><msub><mrow><mi>E</mi></mrow><mrow><mi>α</mi></mrow></msub><mo>=</mo><mn>1055</mn><mo>.</mo><mn>63</mn></mrow></math></span> keV. However, an approximate 5 keV shift observed in the ⁷Li(<span><math><mrow><mi>p</mi><mo>,</mo><mi>n</mi></mrow></math></span>)⁷Be threshold energy over seven years demonstrates the necessity for periodic recalibration. Given the sub-keV reproducibility demonstrated over a two-year period, we recommend recalibrating at least every two years to ensure ongoing energy accuracy for this accelerator. The calibration parameters are a = 0.9918 ± 0.0005 and b = 4.3104 ± 0.5319 kV, where V = <span><math><mrow><mi>a</mi><mi>⋅</mi><msub><mrow><mi>V</mi></mrow><mrow><mtext>set</mtext></mrow></msub></mrow></math></span> + b. This work establishes a robust calibration framework that ensures reliable accelerator performance for nuclear physics researches and applications.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":"568 ","pages":"Article 165829"},"PeriodicalIF":1.4,"publicationDate":"2025-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144916641","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":"Design and assembly of in situ electrical characterization setup for semiconductor devices in mixed neutron and gamma radiation at the University of Florida Training Reactor: Application to HZO-based MFM capacitors","authors":"Chaitanya Sharma ,&nbsp;Andrew O. Boozer ,&nbsp;Jyothier K. Nimmagadda ,&nbsp;Brian C. Shea ,&nbsp;Minjong Lee ,&nbsp;Jiyoung Kim ,&nbsp;Juan C. Nino","doi":"10.1016/j.nimb.2025.165834","DOIUrl":"10.1016/j.nimb.2025.165834","url":null,"abstract":"<div><div>Showcasing the performance of TiN/Hf_0.5Zr_0.5O₂ (HZO)/TiN ferroelectric capacitors (FeCAPs), we present the detailed development and implementation of a new in situ electrical characterization setup, designed and built at the University of Florida’s nuclear reactor facility, for testing semiconductor devices under radiation. This innovative system employs variable shielding materials to filter gamma and neutron radiation selectively. In situ measurements of the HZO devices revealed notable changes in ferroelectric hysteresis loops under increasing variable neutrons (i.e., thermal, epithermal, and fast neutrons) and gamma radiation exposures. Importantly, our study focuses on the real-time evolution of remnant polarization in HZO-based ferroelectric capacitors upon increasing radiation exposure inside the nuclear reactor’s beam port. These findings demonstrate the importance of operando performance of novel non-volatile memory architectures under neutron and gamma radiation, underscoring their application potential in space and related technologies.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":"568 ","pages":"Article 165834"},"PeriodicalIF":1.4,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144916640","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":"Readout system of pixelated silicon detector for compact AMS","authors":"Mirei Takeyama ,&nbsp;Toru Moriya ,&nbsp;Hisako Saitoh ,&nbsp;Hiroko Miyahara ,&nbsp;Fusa Miyake ,&nbsp;Hiromasa Ozaki ,&nbsp;Tetsuya Shiroishi ,&nbsp;Kouji Morimoto ,&nbsp;Daiya Kaji ,&nbsp;Kentaro Nakamura ,&nbsp;Shigeru Itoh ,&nbsp;Kazumasa Kosugi ,&nbsp;Fuyuki Tokanai","doi":"10.1016/j.nimb.2025.165841","DOIUrl":"10.1016/j.nimb.2025.165841","url":null,"abstract":"<div><div>A pixelated silicon detector (PSD) has been developed as a position-sensitive detector for the focal plane in a compact accelerator mass spectrometry (AMS) system. The PSD is useful for tuning the optimal parameters of the AMS system when it is installed in a facility and when the beamline needs to be re-arranged after installation. We have developed a new preamplifier and a data acquisition system for the PSD. The system is more compact and lightweight than circuit systems typically used in high-energy experiments, making it portable and easy to install in other facilities. Moreover, beam diagnostics can be performed in real time with online monitoring of the beam profile. The characteristics of the system were investigated using <span><math><mi>α</mi></math></span> particles and ¹⁴C beams.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":"568 ","pages":"Article 165841"},"PeriodicalIF":1.4,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144914027","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":"Towards AMS measurements of 91Nb, 94Nb and 93Mo produced in fusion environment","authors":"Carlos Vivo-Vilches ,&nbsp;Esad Hrnjic ,&nbsp;Martin Martschini ,&nbsp;Kyra Altindag ,&nbsp;Lee W. Packer ,&nbsp;Robin Golser ,&nbsp;Karin Hain","doi":"10.1016/j.nimb.2025.165847","DOIUrl":"10.1016/j.nimb.2025.165847","url":null,"abstract":"<div><div>Long-lived radionuclides, such as ⁹¹Nb, ⁹⁴Nb and ⁹³Mo, are expected to be produced in nuclear fusion reactors by reactions of high-energy neutrons with the structural material. Accurate predictions of waste categorization require experimental validation of simulation codes like FISPACT-II. This work explores the use of Ion-Laser InterAction Mass Spectrometry (ILIAMS) at the Vienna Environmental Research Accelerator (VERA) to measure these three radionuclides by accelerator mass spectrometry (AMS). The ILIAMS setup employs laser photodetachment to suppress their respective stable isobars: ⁹¹Zr, ⁹⁴Zr and ⁹⁴Mo, and ⁹³Nb.</div><div>For ^91,94Nb measurements, NbO₃⁻ is selected, with interferences from ZrO₃⁻ suppressed by collisions with the He buffer gas in the ion cooler. The suppression can be enhanced by overlapping a 355 nm laser with the ion beam. The lower limit for the suppression factor is 37000. In that way, we reach ⁹¹Zr/⁹³Nb and ⁹⁴Zr/⁹³Nb levels of 1.2 × 10⁻¹⁴ and 1.8 × 10⁻¹⁴, respectively, in targets prepared from commercial Nb₂O₅. MoO₃⁻ is suppressed by a factor of 4360, leading to a ⁹⁴Mo/⁹³Nb interference of 1.28 × 10⁻¹⁰ in the same targets.</div><div>For ⁹³Mo measurements, MoO₂⁻ is selected, with interference from NbO₂⁻ suppressed by 637 nm photons by a factor of 5.5 × 10⁶. This results in a ⁹³Nb/^natMo level of 1.3 × 10⁻¹³ in targets prepared from commercial MoO₃.</div><div>Suppression factors as high as this are not achieved by isobar suppression techniques based on differences in energy loss, not even by AMS facilities with terminal voltages above 8.5 MV.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":"568 ","pages":"Article 165847"},"PeriodicalIF":1.4,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144916639","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}