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

Stopping of very heavy ions in Mylar 阻止迈拉尔中的超重离子

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 : 2024-11-02 DOI: 10.1016/j.nimb.2024.165554

{"title":"Stopping of very heavy ions in Mylar","authors":"","doi":"10.1016/j.nimb.2024.165554","DOIUrl":"10.1016/j.nimb.2024.165554","url":null,"abstract":"<div><div>Available experimental data on Mylar stopping powers (<span><math><mrow><mi>S</mi><mi>P</mi></mrow></math></span>s) for heavy ions (HIs) at energies <span><math><mrow><mn>0</mn><mo>.</mo><mn>04</mn><mo>⩽</mo><mi>E</mi><mo>/</mo><mi>A</mi><mo>⩽</mo><mn>15</mn></mrow></math></span> MeV/nucleon have been compared to different semi-empirical model calculations with the aim of probing their possible usage for the estimates of ranges for very heavy ions at <span><math><mrow><mi>E</mi><mo>/</mo><mi>A</mi><mo><</mo><mn>0</mn><mo>.</mo><mn>5</mn></mrow></math></span> MeV/nucleon, which are of practical interest. Significant deviations from the calculated <span><math><mrow><mi>S</mi><mi>P</mi></mrow></math></span> values were found for fission fragments and lighter HIs at <span><math><mrow><mi>E</mi><mo>/</mo><mi>A</mi><mo><</mo><mn>1</mn></mrow></math></span> MeV/nucleon. A new model parameterization for Mylar <span><math><mrow><mi>S</mi><mi>P</mi></mrow></math></span> has been proposed. Range estimates obtained with any <span><math><mrow><mi>S</mi><mi>P</mi></mrow></math></span> model calculation show a critical dependence of their mean values on the approximated electronic stopping powers and the nuclear (collisional) <span><math><mrow><mi>S</mi><mi>P</mi></mrow></math></span> component. The last plays a crucial role at the end of the range and could only be obtained by calculations. Practical applicability of the results of investigation for very heavy evaporation residues (products of complete fusion reactions induced by HIs) implies the use of a thick catcher foil corresponding to the largest ranges derived in the estimates or the range measurements for these products.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142572080","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}

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Forward and backward emission of secondary ions from biomolecules on single-layer graphene by MeV Cn+ (n = 1–6) impacts 单层石墨烯上的生物大分子在 MeV Cn+（n = 1-6）冲击下向前和向后发射二次离子

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 : 2024-11-02 DOI: 10.1016/j.nimb.2024.165548

引用次数: 0

Gamma irradiation effect on the structural and optical properties of manganese (III) phthalocyanine chloride films: Experimental and theoretical approach for optoelectronic applications 伽马辐照对氯化锰（III）酞菁薄膜的结构和光学特性的影响：光电应用的实验和理论方法

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 : 2024-11-01 DOI: 10.1016/j.nimb.2024.165556

{"title":"Gamma irradiation effect on the structural and optical properties of manganese (III) phthalocyanine chloride films: Experimental and theoretical approach for optoelectronic applications","authors":"","doi":"10.1016/j.nimb.2024.165556","DOIUrl":"10.1016/j.nimb.2024.165556","url":null,"abstract":"<div><div>Irradiation using ionizing radiation such as gamma-ray alters the material characteristics of organic semiconductors, especially the optical and electronic properties. The potential changes of manganese phthalocyanine chloride (MnPcCl) films have been investigated after several gamma irradiation doses (50, 150, and 250 kGy). The possible chemical structure and electronic characteristics of MnPcCl dye were analyzed using the density functional theory-based quantum calculations. The X-ray diffraction of various gamma-ray doses confirmed the amorphous nature of MnPcCl. Based on UV–Vis-NIR spectrophotometric measurements, Tauc’s method has been used to deduce the optical bandgap energy of MnPcCl films before and after γ-irradiation. A slight non-linear reduction was observed in the optical bandgap energy, refractive index, and dielectric constant with rising γ-irradiation doses. The reduction in these optical parameters was due to the increase in the defects and the disorder degree created by γ-irradiation. The low effect on the optical parameters of MnPcCl films confirms its optical stability within this high range of γ-irradiation doses. Such investigation highlights the scope for the stability of this organic dye after exposure to γ-irradiation doses for use in optoelectronic/photonic technological devices.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142572079","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

Reevaluation of neutron energy spectrum in Heavy-Water neutron irradiation facility of Kyoto University research Reactor using multifoil activation method 利用多线圈活化法重新评估京都大学研究用反应堆重水中子辐照设施的中子能谱

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 : 2024-11-01 DOI: 10.1016/j.nimb.2024.165555

{"title":"Reevaluation of neutron energy spectrum in Heavy-Water neutron irradiation facility of Kyoto University research Reactor using multifoil activation method","authors":"","doi":"10.1016/j.nimb.2024.165555","DOIUrl":"10.1016/j.nimb.2024.165555","url":null,"abstract":"<div><div>The Heavy-Water Thermal Neutron Facility at Kyoto University Research Reactor (KUR) has been operational for boron neutron capture therapy (BNCT) since May 1974. Following a facility construction update in 1996, the facility name was changed to the Heavy-Water Neutron Irradiation Facility (HWNIF), and the neutron energy spectra were evaluated using the multifoil activation method. In May 2010, the KUR transitioned its operations from high-enrichment fuel to low-enrichment fuel. However, the neutron energy spectrum in the KUR-HWNIF has not been reevaluated with high accuracy since then. This paper reports the reevaluation of the neutron energy spectrum for the standard epithermal-neutron irradiation mode using the multifoil activation method. Based on the reevaluated results, the epithermal- and fast-neutron fluxes increased by approximately 34 % and 19 %, respectively. The neutron absorption dose rate at evaluation point was approximately 17 % lower than the previous one; however, it remained acceptable from the perspective of BNCT biological irradiation.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142572078","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 Comprehensive study of the exposure and energy absorption buildup factors in some polymer composites for point isotropic Source, including the effect of bremsstrahlung 点各向同性源某些聚合物复合材料的暴露和能量吸收累积因子综合研究，包括轫致辐射的影响

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 : 2024-11-01 DOI: 10.1016/j.nimb.2024.165552

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Measurement of flux-weighted average cross-section in the photo-neutron reactions of Nb at the bremsstrahlung end-point energies of 20 MeV and 67 MeV 在轫致辐射端点能量为 20 MeV 和 67 MeV 时测量铌的光中子反应中的通量加权平均截面

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 : 2024-10-30 DOI: 10.1016/j.nimb.2024.165557

引用次数: 0

Phase and composition analysis of erbium deuteride thin films prepared by magnetron reactive sputtering for proton source target 质子源靶用磁控反应溅射法制备的氘化铒薄膜的相位和成分分析

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 : 2024-10-30 DOI: 10.1016/j.nimb.2024.165558

引用次数: 0

Study of 3089 keV gamma-ray emission from the reaction of 12C(d, pγ1-0)13C for analytical applications 研究 12C(d,pγ1-0)13C 反应产生的 3089 keV 伽马射线辐射的分析应用

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 : 2024-10-29 DOI: 10.1016/j.nimb.2024.165549

引用次数: 0

Experimental assessment and analysis of calculations accuracy for the neutron-induced radio-isotopes in copper parts of radiotherapy accelerators 放疗加速器铜部件中的中子诱导放射性同位素计算精度的实验评估与分析

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 : 2024-10-29 DOI: 10.1016/j.nimb.2024.165553

{"title":"Experimental assessment and analysis of calculations accuracy for the neutron-induced radio-isotopes in copper parts of radiotherapy accelerators","authors":"","doi":"10.1016/j.nimb.2024.165553","DOIUrl":"10.1016/j.nimb.2024.165553","url":null,"abstract":"<div><div>Induced radioactivity in particle accelerators is currently not sufficiently addressed, particularly for radiotherapy electron LINACs when the activation occurs via secondary neutrons created in photo-nuclear reactions.</div><div>Methodologies based on Monte-Carlo simulations coupled with activation calculation codes are often used to address this issue. Their accuracy, which is potentially affected by the limited capabilities of the calculation tools to simulate nuclear reactions at the origin of the materials activation, can be deeply analyzed only through comparisons with experimental values but the latter are not widely available.</div><div>New macroscopic data for the activity induced by neutrons in the materials commonly present in medical electron LINACs are presented. Neutron-induced activation has been measured by sample irradiation at SPIRAL2/NFS facility in accurately characterized configurations. Experimental results were compared to the simulations predictions allowing to assess the precision that can be achieved by a fully simulation-based methodology, mainly related to the energy-dependent reaction cross-sections.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142537431","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}

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Elastic recoil and scattering yields measured in low energy heavy ion ERD 在低能重离子ERD中测量的弹性反冲和散射当量

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 : 2024-10-29 DOI: 10.1016/j.nimb.2024.165542

引用次数: 0