Kooperativer Bibliotheksverbund

In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 72, No. 5 ( 2023), p. 056801-

Abstract: Tungsten is an important candidate of plasma-facing material for fusion reactors. Its irradiation response, especially the post-irradiation annealing (PIA) behavior needs further investigating. In addition, the practice of the “inside-outside” contrast method of determining the characteristics of irradiation induced dislocation loops has not been utilized frequently, and the present research serves as an example to present some practical considerations. In the present work, a tungsten thin-foil specimen is irradiated at 400 ℃ with 58 keV D〈sup〉+〈/sup〉 to a final fluence of 1× 10〈sup〉17〈/sup〉 cm〈sup〉–2〈/sup〉, corresponding to a dose of about 0.1 dpa. The specimen is prepared through the electro-polishing method by using a NaOH based electrolyte. The ion irradiation is carried out directly on the electro-polished specimen. The irradiated specimen is followed by isothermal annealing at 900 ℃ for 1 h. The as-irradiated and post-irradiation annealing modified defects are investigated with a transmission electron microscope (TEM) operated at 200 kV. The irradiation defects are characterized by using TEM bright-field imaging for the same imaging field with different 〈i〉 〈b〉g〈/b〉 〈/i〉 vectors around the three major zone axes: the [001], [111], and [011] zone axis of the body-center cubic lattice of W. For each 〈i〉 〈b〉g〈/b〉 〈/i〉 vector, the ±〈i〉 〈b〉g〈/b〉 〈/i〉 are characterized, and the corresponding contrast-extinctions and “inside-outside” contrasts of selected dislocation loops are identified. The indices of the 〈i〉 〈b〉g〈/b〉 〈/i〉 vectors around different zone axes are assigned consistently with the Kikuchi map. As a result, the D〈sup〉+〈/sup〉 irradiation increases a fine distribution of dislocation loops with an average size of (11.10±5.41) nm and a bulk density of 2.40×10〈sup〉22〈/sup〉 /m〈sup〉3〈/sup〉. Voids are not observed obviously. The post-irradiation annealing causes the loop size to increase and the loop density to decrease, with numbers of (18.25±16.92) nm and 1.19×10〈sup〉22〈/sup〉 /m〈sup〉3〈/sup〉, respectively. Through the contrast-extinction analysis, the dislocation loops in the irradiated and annealed specimen are identified to be 〈i〉 〈b〉a〈/b〉 〈/i〉/2〈inline-formula〉〈tex-math id="Z-20230218170937"〉\begin{document}$\langle {111} \rangle$\end{document}〈/tex-math〉〈alternatives〉〈graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="5-20222124_Z-20230218170937.jpg"/〉〈graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="5-20222124_Z-20230218170937.png"/〉〈/alternatives〉〈/inline-formula〉-type dislocation loops. The post-irradiation annealing also causes the coalescence of large loops and forms large irregular-shaped dislocation loops. Voids with typical sizes of 1–2 nm are also observed in the annealed specimen. The PIA modified microstructure is consistent with the stage IV or stage V characterization of classical PIA induced microstructures. Through the “one-step” inside-outside contrast method, the dislocation loops are identified as an interstitial type. The influcing factors for the “one-step” method are discussed and the importance of consistent indexing is also noted.

Type of Medium: Online Resource

ISSN: 1000-3290 , 1000-3290

URL: Article

DOI: 10.7498/aps.72.20222124

Language: Unknown

Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences

Publication Date: 2023

In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 73, No. 4 ( 2024), p. 042101-

Abstract: The interactions between hyperon-nucleon and hyperon-hyperon have been an important topic in strangeness nuclear physics, which play an important role in understanding the properties of hypernuclei and equation of state of strangeness nuclear matter. It is very difficult to perform a direct scattering experiment of the nucleon and hyperon because the short lifetime of the hyperon. Therefore, the hyperon-nucleon interaction and the hyperon-hyperon interaction have been mainly investigated experimentally by 〈 inline-formula 〉 〈 tex-math id="M4" 〉 \begin{document}$\gamma$\end{document} 〈 /tex-math 〉 〈 alternatives 〉 〈 graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20231531_M4.jpg"/ 〉 〈 graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20231531_M4.png"/ 〉 〈 /alternatives 〉 〈 /inline-formula 〉 spectroscopy of single- 〈 inline-formula 〉 〈 tex-math id="M5" 〉 \begin{document}$\Lambda$\end{document} 〈 /tex-math 〉 〈 alternatives 〉 〈 graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20231531_M5.jpg"/ 〉 〈 graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20231531_M5.png"/ 〉 〈 /alternatives 〉 〈 /inline-formula 〉 hypernuclei or double- 〈 inline-formula 〉 〈 tex-math id="M6" 〉 \begin{document}$\Lambda$\end{document} 〈 /tex-math 〉 〈 alternatives 〉 〈 graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20231531_M6.jpg"/ 〉 〈 graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20231531_M6.png"/ 〉 〈 /alternatives 〉 〈 /inline-formula 〉 hypernuclei. There are also many theoretical methods developed to describe the properties of hypernuclei. Most of these models focus mostly on the ground state properties of hypernuclei, and have given exciting results in producing the banding energy, the energy of single-particle levels, deformations, and other properties of hypernuclei. Only a few researches adopting Skyrme energy density functionals is devoted to the study of the collective excitation properties of hypernuclei. In present work, we have extended the relativistic mean field and relativistic random phase approximation theories to study the collective excitation properties of hypernuclei, and use the methods to study the isoscalar collective excited state properties of double 〈 inline-formula 〉 〈 tex-math id="M7" 〉 \begin{document}$\Lambda$\end{document} 〈 /tex-math 〉 〈 alternatives 〉 〈 graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20231531_M7.jpg"/ 〉 〈 graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20231531_M7.png"/ 〉 〈 /alternatives 〉 〈 /inline-formula 〉 hypernuclei. First, the effect of 〈 inline-formula 〉 〈 tex-math id="M8" 〉 \begin{document}$\Lambda$\end{document} 〈 /tex-math 〉 〈 alternatives 〉 〈 graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20231531_M8.jpg"/ 〉 〈 graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20231531_M8.png"/ 〉 〈 /alternatives 〉 〈 /inline-formula 〉 hyperons on the single-particle energy of 〈 sup 〉 16 〈 /sup 〉 O and 〈 inline-formula 〉 〈 tex-math id="M9" 〉 \begin{document}$^{18}_{\Lambda\Lambda}{\rm{O}}$\end{document} 〈 /tex-math 〉 〈 alternatives 〉 〈 graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20231531_M9.jpg"/ 〉 〈 graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20231531_M9.png"/ 〉 〈 /alternatives 〉 〈 /inline-formula 〉 are discussed in the relativistic mean field theory, the calculations are performed within TM1 parameter set and related hyperon-nucleon interaction, and hyperon-hyperon interaction. We find that it gives a larger attractive effect on the 〈 inline-formula 〉 〈 tex-math id="M10" 〉 \begin{document}${{\mathrm{s}}}_{1/2}$\end{document} 〈 /tex-math 〉 〈 alternatives 〉 〈 graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20231531_M10.jpg"/ 〉 〈 graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20231531_M10.png"/ 〉 〈 /alternatives 〉 〈 /inline-formula 〉 state of proton and neutron, while gives a weaker attractive effect on the state around Fermi surface. The self-consistent relativistic random phase approximation is used to study the collectively excited state properties of hypernucleus 〈 inline-formula 〉 〈 tex-math id="M11" 〉 \begin{document}$^{18}_{\Lambda\Lambda}{\rm{O}}$\end{document} 〈 /tex-math 〉 〈 alternatives 〉 〈 graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20231531_M11.jpg"/ 〉 〈 graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20231531_M11.png"/ 〉 〈 /alternatives 〉 〈 /inline-formula 〉 . The isoscalar giant monopole resonance and quadrupole resonance are calculated and analysed in detail, we pay more attention to the effect of the inclusion of 〈 inline-formula 〉 〈 tex-math id="M12" 〉 \begin{document}$\Lambda$\end{document} 〈 /tex-math 〉 〈 alternatives 〉 〈 graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20231531_M12.jpg"/ 〉 〈 graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20231531_M12.png"/ 〉 〈 /alternatives 〉 〈 /inline-formula 〉 hyperons on the properties of giant resonances. Comparing with the strength distributions of 〈 sup 〉 16 〈 /sup 〉 O, changes of response function of 〈 inline-formula 〉 〈 tex-math id="M13" 〉 \begin{document}$^{18}_{\Lambda\Lambda}{\rm{O}}$\end{document} 〈 /tex-math 〉 〈 alternatives 〉 〈 graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20231531_M13.jpg"/ 〉 〈 graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20231531_M13.png"/ 〉 〈 /alternatives 〉 〈 /inline-formula 〉 are evidently found both on the isoscalar giant monopole resonance and quadrupole resonance. It is shown that the difference comes mainly from the change of Hartree energy of particle-hole configuration and the contribution of the excitations of 〈 inline-formula 〉 〈 tex-math id="M14" 〉 \begin{document}$\Lambda$\end{document} 〈 /tex-math 〉 〈 alternatives 〉 〈 graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20231531_M14.jpg"/ 〉 〈 graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20231531_M14.png"/ 〉 〈 /alternatives 〉 〈 /inline-formula 〉 hyperons. We find that the hyperon-hyperon residual interactions have small effect on the monopole resonance function and quadrupole response function in the low-energy region, and have almost no effect on the response functions in the high-energy region.

Type of Medium: Online Resource

ISSN: 1000-3290 , 1000-3290

URL: Article

DOI: 10.7498/aps.73.20231531

Language: Unknown

Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences

Publication Date: 2024

In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 69, No. 10 ( 2020), p. 107202-

Abstract: The experiment is based on novel magnetic filtered cathodic vacuum arc (FCVA) technology, the effects of the structure and C contents of TiAlCN/TiAlN/TiAl composite coating on anticorrosion and wear resistance were studied. The macro/micro properties of the coatings were systematically characterized by SEM, XRD, XPS, electrochemical tests and friction equipment. The results show that, with the increase of C content,the form of C element in the coatings transforms from the TiAlCN solid solution to the coexistence of crystallized TiAlCN/amorphous carbon. The TiAlCN/TiAlN/TiAl coating with TiAlCNcrystallized/amorphous carbon nanocomposite structure demonstrated excellent performanceby combining the advantages of each layer, which the hardness reaches an ultrahigh leveland the amorphous carbonwith excellent self-lubricating effect exists in the coating structure. In 3.5% NaCl electrochemical corrosion test, 〈i〉E〈/i〉〈sub〉corr〈/sub〉 increased by 5.6 times to 0.271 V, 〈i〉I〈/i〉〈sub〉corr〈/sub〉 decreased by 1/52 to 8.092 ×10〈sup〉–9〈/sup〉 A·cm〈sup〉–2〈/sup〉. During the dry sliding, friction coefficient decreased by 1/3 to 0.43, and wear rate decreased by 1/1.4 to 1.13×10〈sup〉–5〈/sup〉 mm〈sup〉3〈/sup〉·N〈sup〉–1〈/sup〉·m〈sup〉–1〈/sup〉.

Type of Medium: Online Resource

ISSN: 1000-3290 , 1000-3290

URL: Journal

URL: Article

DOI: 10.7498/aps

DOI: 10.7498/aps.69.20200012

Language: Unknown

Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences

Publication Date: 2020

In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 69, No. 10 ( 2020), p. 102901-

Abstract: 〈sec〉The optical and electrical properties of ZnO related on the type and the concentration of defects in ZnO crystal. Ion implantation and annealing can change the type and the concentration of defects in ZnO. To understand the variation of defects in ZnO during ion implantation and after different temperature annealing, in situ luminescence measurements of ZnO crystal samples were carried out by ion beam induced luminescence (IBIL) during ion implantation of 2 MeV H〈sup〉+〈/sup〉 and then after annealing at 473 K and 800 K in vacuum on the GIC4117 tandem accelerator in Beijing Normal University.〈/sec〉〈sec〉IBIL spectra of ZnO showtwo emission peaks: UV emission, which is called near band emission (NBE), and visible emission, which is called deep band emission (DBE).The high-intensity of DBE and weak NBE of IBIL spectra of ZnOmay be due to the NBE is intrinsic to ZnO samples and therefore is just visibly observed from samples that are virtually defect-free. With the ion implantation, the destruction of the crystal structure and the arising of a mass of defects, inducing the weak intensity NBE and intense DBE.In addition, the overall IBIL spectra of ZnOreveal decrease intensity with the ion fluence,which indicates that the concentration of luminescence centersdecreases duringion implantation.With the H〈sup〉+〈/sup〉 fluence, the concentration of the point defects increases. The point defects migrate and subsequently agglomerate into larger defect clusters. These defect clusters serve as traps for catching electrons and holes, which result in the quenching of luminescence centres. Annealing can help todecompose the defect clusters and repair the defects of crystal. However, amounts of defects and clusters still remain in the irradiated sample annealed at 473 K in vacuum, which acted as nonradiative center and suppress the luminescence induced weak intensity of IBIL. Annealing the sample at 800 K in vacuum may facilitate the decomposition of defect clusters during ion irradiation to point defects and the point defect return to the lattice position that can reduce the nonequilibrium defects inside the crystal and improve the crystallinity of the crystal, which increase the intensity of its IBIL.〈/sec〉

Type of Medium: Online Resource

ISSN: 1000-3290 , 1000-3290

URL: Journal

URL: Article

DOI: 10.7498/aps

DOI: 10.7498/aps.69.20200029

Language: Unknown

Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences

Publication Date: 2020

In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 69, No. 10 ( 2020), p. 107801-

Abstract: To contrast the generation and their evolution behaviors of irradiation damage in lithium fluoride under various ion, in situ luminescence measurements from lithium fluoride are carried out under 100 keV H〈sup〉+〈/sup〉, He〈sup〉+〈/sup〉 and O〈sup〉+〈/sup〉 on the ion beam induced luminescence(IBIL) experimental setup on BNU400 ion implanter. Combined with Stopping and Range of Ions in Matter (SRIM) calculation of 100 keV H〈sup〉+〈/sup〉, He〈sup〉+〈/sup〉 and O〈sup〉+〈/sup〉 stopping power in lithium fluoride, the emission intensity under He〈sup〉+〈/sup〉 is the strongest,due to the higher excitation density of electron-hole pairs than them under H〈sup〉+〈/sup〉 and the rising non-radiative recombination ratio under heavy ion O〈sup〉+〈/sup〉. With the mass number increase of the incident ion, the nuclear stopping power would be increased, resulting in the faster rate of both formation and annihilation of point defects、the lower fluence for F-type centers reaching the highest intensity and the weaker luminescence intensity at the state of equilibrium. The irradiation resistance of 〈inline-formula〉〈tex-math id="Z-20200509101000-1"〉\begin{document}$ \rm F_3^{-}/F_2^+ $\end{document}〈/tex-math〉〈alternatives〉〈graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="10-20200020_Z-20200509101000-1.jpg"/〉〈graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="10-20200020_Z-20200509101000-1.png"/〉〈/alternatives〉〈/inline-formula〉 centers at 880 nm are better than the F〈sub〉2〈/sub〉 centers at 670 nm, shown not only in the slower formation and annihilation rates of 〈inline-formula〉〈tex-math id="Z-20200509101000-2"〉\begin{document}$ \rm F_3^{-}/F_2^+ $\end{document}〈/tex-math〉〈alternatives〉〈graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="10-20200020_Z-20200509101000-2.jpg"/〉〈graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="10-20200020_Z-20200509101000-2.png"/〉〈/alternatives〉〈/inline-formula〉 centers but also the higher luminescence intensity of 〈inline-formula〉〈tex-math id="Z-20200509101000-3"〉\begin{document}$ \rm F_3^{-}/F_2^+ $\end{document}〈/tex-math〉〈alternatives〉〈graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="10-20200020_Z-20200509101000-3.jpg"/〉〈graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="10-20200020_Z-20200509101000-3.png"/〉〈/alternatives〉〈/inline-formula〉 centers under heavy ion O〈sup〉+〈/sup〉.

Type of Medium: Online Resource

ISSN: 1000-3290 , 1000-3290

URL: Journal

URL: Article

DOI: 10.7498/aps

DOI: 10.7498/aps.69.20200020

Language: Unknown

Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences

Publication Date: 2020

In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 71, No. 6 ( 2022), p. 064201-

Abstract: Muon radiography is a nondestructive imaging technology based on the naturally existing cosmic ray muons. Because cosmic ray muons have the strong ability to penetrate, muon radiography in which the absorption of muons through matter is utilized, is especially suitable for the imaging of large-scale objects. While the traditional geophysical technologies used in archeology have some limitations, muon radiography is expected to become a powerful supplement in the nondestructive detection of large-scale cultural relics. Based on Monte Carlo simulation method Geant4, the muon radiography of the underground palace of Qinshihuang Mausoleum is studied in this work. A model of the underground palace of Qinshihuang Mausoleum is set up with GEANT4 program according to the data acquired by the previous archaeological study of Qinshihuang Mausoleum’s inner structure, as well as a reference model without these inner structure. By investigating the differences between the muon fluxes obtained from the two models, the muon radiography image of the inner structure of the model can be obtained. During the simulation, the cosmic ray muon source is generated by sampling according to an empirical formula summarized by Reyna, which can accurately describe the energy spectrum and angular distribution of cosmic ray muons at sea level. In addition, two viewpoints are selected in order to determine the three-dimensional position of the chamber. The simulation data are processed by using an image reconstruction algorithm which can be described as the following three steps. Firstly, the counts of muons in different directions are converted into muon flux. Secondly, the muon flux of the reference model is deducted from that of the Qinshihuang Mausoleum model, and the angular coordinates of the chamber walls are determined. Finally, combined with the wall’s angular coordinates obtained from the two viewpoints and the relative position between the two viewpoints, the chamber size and its position are reconstructed according to the geometric relationship. The errors of the reconstructed chamber center position and the length of chamber walls are both approximately 7%. In this article, we conduct only a preliminary study of muon radiography applied to the nondestructive detection of Qinshihuang Mausoleum, but the results show that muon radiography can be a promising tool for the archeological study of Qinshihuang Mausoleum. In the follow-up study, more factors will be taken into consideration, including the details of Qinshihuang Mausoleum model, and the improvement of image reconstruction algorithm.

Type of Medium: Online Resource

ISSN: 1000-3290 , 1000-3290

URL: Journal

URL: Article

DOI: 10.7498/aps

DOI: 10.7498/aps.71.20211582

Language: Unknown

Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences

Publication Date: 2022

In: Chinese Journal of Luminescence, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Vol. 43, No. 02 ( 2022), p. 226-237

Type of Medium: Online Resource

ISSN: 1000-7032

URL: Article

DOI: 10.37188/CJL.20210339

Language: English

Publisher: Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences

Publication Date: 2022

In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 72, No. 3 ( 2023), p. 034203-

Abstract: Laser has the advantages of high brightness, good monochromaticity, high coherence and good directionality, however, in some cases such as laser imaging and laser processing where only its high brightness or high monochromaticity is desired, the interference effect caused by high coherence can affect and limit its effective applications. In this work, a new single glass tube decoherence lens (SGTDL) is designed for soft X-ray laser decoherence through the simulation calculations. The simulation results show that an SGTDL with an entrance diameter of 5 mm, exit diameter of 0.6 mm and a length of 15 cm can effectively reduce the coherence of the X-ray laser with a wavelength of 10 nm and a beam waist radius of 1.25 mm. At the same time, the exit beam with a divergence range of 30–50 mrad is obtained at the SGTDL’s exit, and the transmission efficiency and gain in power density of the SGTDL are 78% and 52.74, respectively. For a laser beam with a wavelength of up to 1 nm, this model of SGTDL can maintain the transmission efficiency of the beam at more than 30%. This work also discusses the influence of the X-ray laser energy and the SGTDL’s length on the transmission performances of the SGTDL. The results show that the SGTDL designed according to the total reflection principle can meet the application requirements for laser decoherence in a range from the extreme ultraviolet to X-ray wavelength, and has a wide application prospect in X-ray laser imaging, laser processing, etc.

Type of Medium: Online Resource

ISSN: 1000-3290 , 1000-3290

URL: Article

DOI: 10.7498/aps.72.20221917

Language: Unknown

Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences

Publication Date: 2023

In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 71, No. 16 ( 2022), p. 168703-

Abstract: The effects of carbon traps in Fe-C alloys on matrix defects and the evolutions of matrix defects in Fe-C alloys under irradiation are investigated in this paper. The object kinetic Monte Carlo (OKMC) modeling is used to establish a bridge between the micro-computational simulation data and the macro-experimental data. The simulation results verify the evolution of the carbon (C)-vacancy (Vac) complex under ideal conditions, and at relatively low temperatures, the complex is mainly C-Vac〈sub〉2〈/sub〉. Under the assumption of complex traps, the evolution of matrix defects in Fe-C systems under irradiation is simulated in this work. It is verified that the carbon vacancy complex has an obvious trapping effect on matrix defects, and the simulation results of evolution simulation of matrix defects in the Fe-C system under irradiation are consistent with the experimental results. Furthermore, the effective approximate parameters used in the simulation are compared and discussed. The present research can provide a basic support for the research on the evolution of iron-based alloy irradiation defects.

Type of Medium: Online Resource

ISSN: 1000-3290 , 1000-3290

URL: Article

DOI: 10.7498/aps.71.20220090

Language: Unknown

Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences

Publication Date: 2022

In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 72, No. 5 ( 2023), p. 052901-

Abstract: Rare event detection is a frontier subject in particle physics and nuclear physics. In particular, dark matter detection, neutrino-free double beta decay and neutrino-nucleon coherent elastic scattering are being planned and implemented gradually. Rare event detection requires not only the detectors to possess excellent performances but also extremely low environmental background, so the selection of detectors and related materials is an important issue in rare event detection. Liquid argon has become an important scintillator material for scintillator detectors because of its low cost, good scintillation performance and large volume. Liquid argon was first studied in the 1940s as a sensitive material for ionizing radiation detectors. The first measurements of high-energy beta particles were obtained by using a liquid argon ionization chamber in 1953. The ICARUS group put forward the idea of constructing liquid argon temporal projection chamber, and made attempt to construct liquid argon temporal projection chamber in 1977. The scintillation light signals were collected for the first time in a liquid argon temporal projection chamber in 1999. Thus, the drift time of the particle can be obtained to determine the particle track. After development, single-phase liquid argon scintillator detector and two-phase argon time projection chamber have become two common types of liquid argon detectors, and have been extensively used in rare event detection experiments in recent years. For dark matter detection, the DEAP group and DarkSide group have achieved good results with single-phase liquid argon scintillation detector and two-phase argon time projection chamber, respectively. For neutrino-free double beta decay experiments, the GERDA group has done a lot of researches of liquid argon anti-coincidence system and applied the said system to experiments. The LEGEND group, which is the combination of GERDA and MAJORANA experimental group, upgraded the liquid argon anti-coincidence system which was applied to the following LEGEND-200 project. For neutrino-nucleon elastic scattering experiments, COHERENT obtained the latest results by using the liquid argon detectors. The Taishan neutrino-nucleon coherent elastic scattering project of the High Energy Institute of Chinese Academy of Sciences has also begun to study the feasibility of liquid argon anti-coincidence system. Finally, this paper discusses the direction of optimizing the liquid argon detector, such as exposure, background level and optical readout scheme, and gives a good prospect of liquid argon detector applied to rare event detection in the future.

Type of Medium: Online Resource

ISSN: 1000-3290 , 1000-3290

URL: Article

DOI: 10.7498/aps.72.20222055

Language: Unknown

Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences

Publication Date: 2023