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Nuclear instruments & methods in physics research.... 10건

  1. [해외논문]   Editorial Board  


    Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms v.429 ,pp. ii - ii , 2018 , 0168-583x ,

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  2. [해외논문]   Excitation functions and cross section ratios for the formation of the isomeric pairs 102m,g;101m,g;99m,gRh in the natPd(p,2pxn) reactions  

    Nguyen, Thi Hien (Department of Physics, Kyungpook National University, Daegu 41566, Republic of Korea ) , Nguyen, Van Do (Institute of Fundamental Research and Application, Duy Tan University, 73 Hoang Cau Street, Hanoi, Viet Nam ) , Nguyen, Thanh Luan (Institute of Physics, Vietnam Academy of Science and Technology, 10 Dao Tan, Hanoi, Viet Nam ) , Kim, Guinyun (Department of Physics, Kyungpook National University, Daegu 41566, Republic of Korea ) , Kim, Kwangsoo (Department of Physics, Kyungpook National University, Daegu 41566, Republic of Korea ) , Uddin, Md. Shuza (Tandem Accelerator Facilities, Institute of Nuclear Science and Technology, Atomic Energy Research Establishment, Savar, Dhaka, Bangladesh ) , Naik, Haladhara (Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India)
    Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms v.429 ,pp. 1 - 8 , 2018 , 0168-583x ,

    초록

    Abstract Excitation functions of the nat Pd(p,2pxn) 102m,g;101m,g;99m,g Rh reactions and the cross section ratios for the isomeric pairs 102m,g Rh, 101m,g Rh and 99m,g Rh have been measured up to 42.61 MeV. The experiments were carried out using a stacked-foil activation technique. The proton beam intensity was determined based on the nat Cu(p,xn) 62 Zn and nat Cu(p,xn) 65 Zn monitoring reactions. The activities of the irradiated palladium and cooper monitor foils were measured using a HPGe γ-ray detector. The present experimental cross sections are compared with reference data and with the theoretical predictions from TENDL-2015 libraries. The cross sections for the nuclear reactions nat Pd(p,2pxn) 102m,g Rh were measured in the energy range of 20–40 MeV and the cross section ratios for all three isomeric pairs 102m,g Rh, 101m,g Rh and 99m,g Rh produced in the nat Pd(p,2pxn) reactions are the first measurements.

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  3. [해외논문]   Dynamic evolutions of swift heavy ion induced latent tracks under electron bombardment from TEM  

    Zhang, S.X. (Institute of Modern Physics, Chinese Academy of Sciences (CAS), Lanzhou 730000, PR China ) , Liu, J. (Institute of Modern Physics, Chinese Academy of Sciences (CAS), Lanzhou 730000, PR China ) , Zeng, J. (Institute of Modern Physics, Chinese Academy of Sciences (CAS), Lanzhou 730000, PR China ) , Hu, P.P. (Institute of Modern Physics, Chinese Academy of Sciences (CAS), Lanzhou 730000, PR China ) , Xu, L.J. (Institute of Modern Physics, Chinese Academy of Sciences (CAS), Lanzhou 730000, PR China ) , Maaz, K. (Institute of Modern Physics, Chinese Academy of Sciences (CAS), Lanzhou 730000, PR China ) , Zhai, P.F. (Institute of Modern Physics, Chinese Academy of Sciences (CAS), Lanzhou 730000, PR China ) , Duan, J.L. (Institute of Modern Physics, Chinese Academy of Sciences (CAS), Lanzhou 730000, PR China)
    Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms v.429 ,pp. 9 - 13 , 2018 , 0168-583x ,

    초록

    Abstract Dynamic evolutions of morphology and size of swift heavy ion (SHI) induced latent tracks in muscovite mica were explored using in situ transmission electron microscopy (TEM) in this paper. Prior to the measurements, muscovite mica sheets were irradiated with Kr and Bi ions with electronic energy loss (d E /d x ) e of 5.9 keV/nm and 31.5 keV/nm, respectively. It is observed in TEM micrographs that the latent tracks in mica are continuously along the cross section view of the ion tracks. The track profile is not found dramatically uniform but rather it is found slightly fluctuating for similar (d E /d x ) e values. In situ TEM observation clarify that atoms in the track halo are unstable compared with the lattice atoms in the vicinity of the track. Point defects induced by the electron bombardment are generated preferentially around the track core, which results in the increased diameter of the track.

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  4. [해외논문]   Synthesis of a silver/TiO2 nanotube nanocomposite by gamma irradiation for enhanced photocatalytic activity under sunlight  

    Viet, Pham Van (Nanomaterials for Environmental Applications Laboratory, Faculty of Materials Science and Technology, University of Science, VNU-HCMC, Ho Chi Minh City 700000, Viet Nam ) , Sang, Truong Tan (CM Thi Laboratory, Ho Chi Minh City University of Technology (HUTECH), Ho Chi Minh City 700000, Viet Nam ) , Hien, Nguyen Quoc (Research and Development Center for Radiation Technology (VINATOM), Ho Chi Minh City 700000, Viet Nam ) , Thi, Cao Minh (CM Thi Laboratory, Ho Chi Minh City University of Technology (HUTECH), Ho Chi Minh City 700000, Viet Nam ) , Hieu, Le Van (Nanomaterials for Environmental Applications Laboratory, Faculty of Materials Science and Technology, University of Science, VNU-HCMC, Ho Chi Minh City 700000, Viet Nam)
    Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms v.429 ,pp. 14 - 18 , 2018 , 0168-583x ,

    초록

    Abstract In this study, a nanocomposite of silver loaded on TiO 2 nanotubes (Ag/TNTs) was synthesized by a gamma irradiation method with a 92.42% yield. The optimized scale for Ag/TNT synthesis was 1.29 g of precursors per 100 mL solvent. The morphology and crystal structure of the Ag/TNTs were determined by transmission electron microscopy and X-ray diffraction, respectively. The Ag weight percentage in Ag/TNTs was analyzed by inductively coupled plasma atomic emission spectrometry. The results showed that the size of silver nanoparticles on the TNTs decreased when the precursor weight decreased. The Ag/TNT nanocomposite removed 95.45% of methylene blue under simulated sunlight irradiation and could be reused five times with an almost unchanged activity. The formation mechanism of silver nanoparticles on TNTs is also discussed.

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  5. [해외논문]   Measurement of L XRF cross sections for elements with 33 ≤ Z ≤ 51 and their interpretation in terms of Li (i = 1–3) subshell vacancy decay parameters  

    Duggal, Heena (Department of Physics, Panjab University, Chandigarh 160014, India ) , Sharma, Veena (Department of Physics, Panjab University, Chandigarh 160014, India ) , Kainth, H.S. (Department of Physics, Panjab University, Chandigarh 160014, India ) , Kumar, Sanjeev (Department of Physics, Panjab University, Chandigarh 160014, India ) , Shahi, J.S. (Department of Physics, Panjab University, Chandigarh 160014, India ) , Mehta, D. (Department of Physics, Panjab University, Chandigarh 160014, India)
    Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms v.429 ,pp. 19 - 26 , 2018 , 0168-583x ,

    초록

    Abstract The L i ( i = 1–3) subshell integral X-ray fluorescence (XRF) cross sections have been measured for 17 elements with 33 ≤ Z ≤ 51 following photoionization by the Mn K X-rays ( E Kαβ = 5.96 keV). T 5.96 keV). The L i ( i = 1–3) subshell X-rays were measured using a low-energy Ge (LEGe) detector at an emission angle, ψ = 125 125°, where angle-dependent emission effects, if any, are nullified as P 2 (cos ψ ) ∼ 0. The XRF cross sections were interpreted in terms of available sets of theoretical L i ( i = 1–3) subshell photoionization cross sections, radiative transition probabilities, and the atomic vacancy decay parameters, namely, fluorescence ( ω i ) and Coster-Kronig ( f ij ) yields. A set of L 1 subshell fluorescence ( ω 1 ) yields was deduced for the elements with 37 ≤ Z ≤ 51 from the present measured Lγ 2,3,(4) [ L 1 - N 2,3 ( O 2,3 )] XRF cross sections. The ω 1 values exhibit jumps at Z = 40 and 49, which are identified to be due to cut-off of the L 1 L 2 M 4,5 and L 1 L 3 M 4,5 Coster-Kronig (CK) transitions predicted by calculations based on relativistic Dirac-Hartree-Slater (RDHS) model. However, the measured ω 1 values are found to differ considerably from those based on the RDHS model calculations for the elements below Z = 50. The pronounced discrepancies between measured and theoretical ω 1 values are likely to be due to overestimation of the L 1 - L 2,3 M 4,5 CK transition rates by a factor of ∼2–3. Our experiential results demand consideration of extra-atomic relaxation from the solid-state effects and exchange splitting in many-body theoretical calculations of the low-energy CK transitions. Highlights L i ( i = 1–3) subshell XRF cross sections for 17 elements with 33 ≤ Z ≤ 51 at 5.96 keV. Comparison of the measured cross sections with the theoretical calculated ones. Evaluation of atomic relaxation parameters from measured XRF cross-sections. Interpretation of the pronounced discrepancies in terms of vacancy decay parameters.

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  6. [해외논문]   Neutron energy spectrum measurement using an NE213 scintillator at CHARM  

    Kajimoto, Tsuyoshi (Hiroshima University, 1-4-1, Kagamiyama, Higashi-Hiroshima 739-8527, Japan ) , Sanami, Toshiya (High Energy Accelerator Research Organization, Oho, Tsukuba 305-0801, Japan ) , Nakao, Noriaki (Shimizu Corporation, 3-4-17 Etchujima, Koto-ku, Tokyo 135-8530, Japan ) , Froeschl, Robert (CERN, 1211 Geneva 23, Switzerland ) , Roesler, Stefan (CERN, 1211 Geneva 23, Switzerland ) , Iliopoulou, Elpida (CERN, 1211 Geneva 23, Switzerland ) , Infantino, Angelo (CERN, 1211 Geneva 23, Switzerland ) , Brugger, Markus (CERN, 1211 Geneva 23, Switzerland ) , Lee, Eunji (Kyushu University, Motooka, Nishi-ku, Fukuoka 819-0395, Japan ) , Shigyo, Nobuhiro (Kyushu University, Motooka, Nishi-ku, Fukuoka 819-0395, Japan ) , Hagiwara, Masayuki (High Energy Accelerator Research Organization, Oho, Tsukuba 305-0801, Japan ) , Yashima, Hiroshi (Research Reactor Institute, Kyoto University, 2-1010 Asashiro-nishi, Kumatori, Sennan, Osaka 590-0494, Japan ) , Yamazaki, Hirohito (High Energy Accelerator Research Organization, Oho, Tsukuba 305-0801, Japan ) , Tanaka, Kenichi (Hiroshima University, 1-4-1, Kagamiyama, Higashi-Hiroshima 739-8527, Japan ) , Endo, Satoru (Hiroshima University, 1-4-1, Kagamiyama, Higashi-Hiroshima 739-8527, Japan)
    Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms v.429 ,pp. 27 - 33 , 2018 , 0168-583x ,

    초록

    Abstract To establish a methodology for neutron spectrum measurement at the CERN High energy AcceleRator Mixed field facility (CHARM), neutron spectra were measured using an NE213 scintillator on top of the CHARM roof shielding where is the CERN Shielding Benchmark Facility (CSBF). The spectra were derived as fluences into the scintillator by the unfolding method using an iterative Bayesian algorithm. The methodology was verified based on the agreement of two spectra measured for different positions and directions of incident neutrons by changing the detector orientation. Since the spectra on the roof-top were obtained within a reasonable beam-time, this methodology is suitable for measuring the spectrum when there is less shielding material. Thus, experimental data for neutron transition can be obtained as a function of shielding thickness using this facility.

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  7. [해외논문]   Investigation of energy absorption by clustered gold nanoparticles  

    Kwon, Jihun (Department of Radiation Oncology, Graduate School of Medicine, Hokkaido University, Sapporo, Japan ) , Sutherland, Kenneth (Global Station for Quantum Medical Science and Engineering, Global Institution for Collaborative Research and Education (GI-CoRE), Hokkaido University, Sapporo, Japan ) , Makarova, Anastasia (Global Station for Quantum Medical Science and Engineering, Global Institution for Collaborative Research and Education (GI-CoRE), Hokkaido University, Sapporo, Japan ) , Matsuura, Taeko (Global Station for Quantum Medical Science and Engineering, Global Institution for Collaborative Research and Education (GI-CoRE), Hokkaido University, Sapporo, Japan ) , Hashimoto, Takayuki (Department of Radiation Medicine, Faculty of Medicine, Hokkaido University, Sapporo, Japan ) , Peng, Hao (Global Station for Quantum Medical Science and Engineering, Global Institution for Collaborative Research and Education (GI-CoRE), Hokkaido University, Sapporo, Japan ) , Toshito, Toshiyuki (Department of Proton Therapy Physics, Nagoya City West Medical Center, Nagoya Proton Therapy Center, Nagoya, Japan ) , Umegaki, Kikuo (Global Statio) , Shirato, Hiroki , Shimizu, Shinichi
    Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms v.429 ,pp. 34 - 41 , 2018 , 0168-583x ,

    초록

    Abstract The utilization of gold nanoparticles (GNPs) as a radiation sensitizer has received broad attention. Although GNPs form clusters in living cells, most previous simulation studies have assumed a homogeneous distribution of GNPs. In this study, a GNP cluster was constructed for simulations and the impact of cluster formation on dose enhancement was examined. Energy absorption by the GNPs was compared between clustered and homogeneous distributions for several different GNP concentrations and diameters under 100 keV X-ray irradiations. Our simulations showed that clusters more efficiently absorbed the secondary electrons and photons produced by GNPs themselves. Furthermore, the impact of cluster formation on dose enhancement was more significant for smaller GNPs and higher concentrations. Our results suggest that previous simulations assuming a homogeneous GNP distribution have overestimated the dose enhancement, especially for smaller GNPs and higher concentrations. These findings should guide the selection of GNP size and concentration for effectively optimizing dose enhancement in future studies.

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  8. [해외논문]   Yield measurement and Monte Carlo correction of CPDG neutron generator  

    Zhang, Yingzeng (Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China ) , Zeng, Jun (Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China ) , Guo, Xiaofeng (Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China ) , Zheng, Pu (Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China ) , Li, Gang (School of Physics, Northeast Normal University, Changchun, Jilin 130024, China ) , Xiang, Yongchun (Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China ) , Hao, Fanhua (Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China ) , Xiang, Qingpei (Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China)
    Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms v.429 ,pp. 42 - 47 , 2018 , 0168-583x ,

    초록

    Abstract It is useful to obtain the exact neutron yield and distribution of a portable neutron generator. In this paper, the neutron yield of a K400 accelerator D-D neutron source under conditions of 160 kV and 25 uA is 1.69 × 10 6 ± 4.1 × 10 4 n/s, which is calibrated using the associated proton method. A long counter consisting of a 3 He counter surrounded by a paraffin cylinder was used as secondary standard after efficiency calibration using a K400 accelerator. The Monte Carlo method is then used to evaluate the distribution change of emitted neutrons from each surface of the CPDG caused by its structural materials. Energy spectrum distortion and angle distribution distortion of emitted neutrons are studied. Simulation results show that the proportion of the forward neutron is reduced and the proportion of the lateral neutron is increased. The number of neutron transporting into the counter has been reduced by 28.1%, 28.4%, 29.8%, 29.0%, 28.7%, and 28.0% for acceleration voltages of 90 kV, 100 kV, 110 kV, 120 kV, 130 kV, and 160 kV, respectively. In addition, the respective yield correction factors caused by structural materials are 1.36, 1.38, 1.38, 1.34, 1.37, and 1.39. The neutron yield of the CPDG is 1.28 × 10 6 and 1.75 × 10 6 before and after Monte Carlo correction when working at conditions of 130 kV and 600 μA. The total uncertainty of this result is approximately 6%.

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  9. [해외논문]   Intense heavy ion beam-induced material evaporation and the resulting dynamic vacuum deterioration of the beam line  

    Ren, Jieru (School of Science, Xi'an Jiaotong University, China ) , Zhao, Yongtao (School of Science, Xi'an Jiaotong University, China ) , Bozyk, Lars (GSI Helmholtzzentrum für Schwerionenforschung, Germany ) , Maurer, Christoph (GSI Helmholtzzentrum für Schwerionenforschung, Germany ) , Blazevic, Abel (GSI Helmholtzzentrum für Schwerionenforschung, Germany ) , Spiller, Peter (GSI Helmholtzzentrum für Schwerionenforschung, Germany ) , Xiao, Guoqing (Institute of Modern Physics, Chinese Academy of Sciences, China ) , Hoffmann, Dieter H.H. (School of Science, Xi'an Jiaotong University, China)
    Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms v.429 ,pp. 48 - 52 , 2018 , 0168-583x ,

    초록

    Abstract We studied the explosive evaporation of high energy density matter generated by irradiation of intense heavy ion beams and the resulting effect on the dynamic vacuum of the accelerator beamlines. High Energy Density Physics (HEDP) experiments are proposed at the plasma physics terminal at the Facility of Antiproton and Ion Research (FAIR), which is currently under construction. The target response to irradiation by intense beam was simulated by HEIGHTS (High Energy Interaction with General Heterogeneous Target Systems) simulation package. The vacuum deterioration resulting from the target evaporation was simulated with the Molflow+ Monte-Carlo simulator. Experimentally we measured the pressure wave propagation at the HTD beamline at GSI in order to benchmark the simulation. The pressure wave was generated through ohmic heating of a cold surface.

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  10. [해외논문]   Excitation functions for (p,x) reactions of niobium in the energy range of Ep = 40–90 MeV  

    Voyles, Andrew S. (Department of Nuclear Engineering, University of California, Berkeley, Berkeley, CA 94720, USA ) , Bernstein, Lee A. (Department of Nuclear Engineering, University of California, Berkeley, Berkeley, CA 94720, USA ) , Birnbaum, Eva R. (Isotope Production Facility, Chemistry Division, Los Alamos National Laboratory, Los Alamos, NM 87544, USA ) , Engle, Jonathan W. (Department of Medical Physics, University of Wisconsin –) , Graves, Stephen A. (Madison, Madison, WI 53705, USA ) , Kawano, Toshihiko (Department of Radiation Oncology, University of Iowa, Iowa City, IA 52242, USA ) , Lewis, Amanda M. (Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87544, USA ) , Nortier, Francois M. (Department of Nuclear Engineering, University of California, Berkeley, Berkeley, CA 94720, USA )
    Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms v.429 ,pp. 53 - 74 , 2018 , 0168-583x ,

    초록

    Abstract A stack of thin Nb foils was irradiated with the 100 MeV proton beam at Los Alamos National Laboratory’s Isotope Production Facility, to investigate the 93 Nb(p,4n) 90 Mo nuclear reaction as a monitor for intermediate energy proton experiments and to benchmark state-of-the-art reaction model codes. A set of 38 measured cross sections for nat Nb(p,x) and nat Cu(p,x) reactions between 40–90 MeV, as well as 5 independent measurements of isomer branching ratios, are reported. These are useful in medical and basic science radionuclide productions at intermediate energies. The nat Cu(p,x) 56 Co, nat Cu(p,x) 62 Zn, and nat Cu(p,x) 65 Zn reactions were used to determine proton fluence, and all activities were quantified using HPGe spectrometry. Variance minimization techniques were employed to reduce systematic uncertainties in proton energy and fluence, improving the reliability of these measurements. The measured cross sections are shown to be in excellent agreement with literature values, and have been measured with improved precision compared with previous measurements. This work also reports the first measurement of the nat Nb(p,x) 82m Rb reaction, and of the independent cross sections for nat Cu(p,x) 52g Mn and nat Nb(p,x) 85g Y in the 40–90 MeV region. The effects of nat Si(p,x) 22,24 Na contamination, arising from silicone adhesive in the Kapton tape used to encapsulate the aluminum monitor foils, is also discussed as a cautionary note to future stacked-target cross section measurements. A priori predictions of the reaction modeling codes CoH, EMPIRE, and TALYS are compared with experimentally measured values and used to explore the differences between codes for the nat Nb(p,x) and nat Cu(p,x) reactions.

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