Dielectronic and Trielectronic Recombination Rate Coefficients of Be-like Ar
                    <sup>14+</sup>

Huang, Zhongkui; Wen, Weiqiang; Xu, Xin; Mahmood, Sultan; Wang, Shu-Xing; Wang, H. B.; Dou, Lijun; Khan, Nadir; Badnell, N. R.; Preval, S. P.; Schippers, S.; Xu, Tianhong; Yu, Yang; Yao, Ke; Xu, Wenzhen; Chuai, Xiaoyu; Zhu, Xiaolong; Zhao, Dongmei; Mao, Lijun; M., X.; Li, J.; Mao, Ruishi; Yuan, Y.J.; Wu, Beimin; Sheng, Lianxi; Yang, Jie; Xu, H. S.; Zhu, Lin-Fan; Ma, Xinwen

doi:10.3847/1538-4365/aaa5b3

Cited by 35 publications

(30 citation statements)

References 44 publications

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“…These autoionization resonances make up the intermediate states of the electron-ion recombination process. Especially, the intrashell two-electron excited (2s 2 → 2p 2 ) resonance series 2p 2 3 P e 0,1,2 , 1 D e 2 , 1 S e 0 n l (n 6) are attributed to the strong trielectronic recombination (TR) rate coefficients [7]. Based on the analytical property, we can easily obtain all relevant autoionization resonances (n → ∞) to show the quasiperiodicity by its effective quantum number ν.…”

Section: Properties Of the Autoionization Statesmentioning

confidence: 99%

“…( 6) under additional constraining conditions of Eq. (7). And the gray dashed lines show the energy relation between ν 3 P o 1 and ν 3 P o 0 according to Eq.…”

Section: B Calculation Of Discrete Energy Levels and The Assessment O...mentioning

confidence: 99%

“…The opened color symbols at intersection points of solid solution curves [Eqs. ( 6) and (7)] and gray dashed lines [Eq. ( 5)] represent all our calculated energy levels of highly charged Ar 14+ ions.…”

Section: B Calculation Of Discrete Energy Levels and The Assessment O...mentioning

confidence: 99%

“…For example, argon (Z = 18) is one of the most abundant heavy elements in the universe. Emission lines from argon have been observed and were applied for plasma diagnostics [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…Then with the same experimental energy resolution, many more bound or resonant states are required to be considered for relevant physical processes. Based on the discussion above, one is not surprised by recent precision electron-ion recombination experiments of Be-like Ar 14+ ions at the main coolerstorage ring (CSRm), where substantial discrepancies existed between measured recombination rates and theoretical results calculated by the distorted wave (DW) method [7]. Thus, a theoretical method which can treat these intrashell electron correlations adequately and provide accurate resonance positions as well as autoionization rates efficiently is urgently required for a better understanding of measured recombination spectra of HCIs.…”

Section: Introductionmentioning

confidence: 99%

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Relativistic eigenchannelR-matrix studies of the strong intrashell electron correlations in highly chargedAr13+ions

et al. 2020

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Highly charged ion systems play an important role in simulation and diagnostics of astrophysical and fusion plasmas. Due to dominant strong Coulomb interactions from the nuclear charge, electron correlations are generally thought to be less prominent than relativistic effects and other effects in HCIs. In this paper, we demonstrate the importance of strong intrashell electron correlations from the quasidegeneracy of 2s, 2p orbitals in highly charged B-like Ar 13+ ions. Such strong intrashell electron interactions manifest as an atomic system with many channel interactions, which will ultimately form a much more complex atomic spectrum than the neutral B atom in the isoelectronic sequence. As a typical example, the relativistic eigenchannel R-matrix method (R-R-eigen code) was successfully applied to investigate the complex spectrum of Ar 13+ ions with J π = 1.5 + symmetry in discrete and autoionization regions. Calculated results obviously show interesting behaviors of strong intrashell electron correlations in HCIs. Additionally, it is also beneficial to understand discrepancies in the low-energy electron-ion recombination spectra of Be-like Ar 14+ ions between experimental observations at the main cooler-storage ring of the Heavy Ion Research Facility in Lanzhou and distorted wave calculation.

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Section: Properties Of the Autoionization Statesmentioning

confidence: 99%

“…( 6) under additional constraining conditions of Eq. (7). And the gray dashed lines show the energy relation between ν 3 P o 1 and ν 3 P o 0 according to Eq.…”

Section: B Calculation Of Discrete Energy Levels and The Assessment O...mentioning

confidence: 99%

Section: B Calculation Of Discrete Energy Levels and The Assessment O...mentioning

confidence: 99%

“…For example, argon (Z = 18) is one of the most abundant heavy elements in the universe. Emission lines from argon have been observed and were applied for plasma diagnostics [6,7].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Relativistic eigenchannelR-matrix studies of the strong intrashell electron correlations in highly chargedAr13+ions

et al. 2020

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Dielectronic recombination at low energy range with Boron‐like Ar¹³⁺at the CSRm

et al. 2019

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In order to extend the dielectronic recombination (DR) experiments from the main cooler storage ring CSRm with intermediate charge state ions to the experimental cooler storage ring CSRe with highly charged ions and even radioactive ions, a test electron‐ion recombination experiment of B‐like Ar13+ ions was performed with a section of the new electron beam energy detuning system, which will be installed at the CSRe. We present the measured and also the calculated DR spectra for the ∆n = 0 resonances from 0 to 3 eV. The experimental results agree very well with the previous DR experimental data from CRYRING, and the energy resolution reached 30 meV full width at half maximum. This test experiment demonstrates that the reliability and stability of the newly developed electron beam energy detuning system are satisfactory for the upcoming DR experiments at the CSRe. However, we found large discrepancies between the experimental result and the calculation in both resonance positions and the intensities of the recombination spectrum below 0.7 eV, which indicate that precise calculation of the DR spectrum of multielectron ions is still a challenge.

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Status of the high-intensity heavy-ion accelerator facility in China

Xiao-Hong

Jiang

2022

AAPPS Bull.

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Nuclear physics has been aiming at understanding of the origin, structure, and property of strongly interacting matters, which constitute nearly all visible matter in the universe. Despite tremendous breakthroughs and achievements over the past century, there still exists overarching questions that animate nuclear physics today and incite constructing next-generation heavy-ion accelerator complexes worldwide. In order to promote the national development of heavy-ion science and technology, China government approved the high-intensity heavy-ion accelerator facility (HIAF) in 2015, proposed by the Institute of Modern Physics, Chinese Academy of Sciences. HIAF is composed of a superconducting ion linear accelerator, a high-energy synchrotron booster, a high-energy radioactive isotope beam line, an experimental storage ring, and a few experimental setups. By using HIAF characterized with unprecedented intense ion beams from hydrogen through uranium, we can produce a large variety of exotic nuclear matters not normally found on the Earth, including super-heavy nuclides, short-lived extremely neutron-rich and proton-rich nuclides, finite nuclear matters in the quantum chromodynamics phase diagram, exotic nuclides containing hyperons, meson-nucleus-bound systems, and highly charged ions. Therefore, HIAF will bring researchers to the forefront of promoting the most vigorous and fascinating fields in nuclear physics, such as to explore the limits to the existence of nuclides in terms of proton and neutron numbers, to discover exotic nuclear structure and properties and then to study the physics behind, to understand the origin of heavy elements in the cosmos, to depict the phase diagram of strongly interacting matter, etc. In addition, HIAF will provide an excellent platform to develop heavy-ion applications in life science, space science, and material science. The construction of HIAF started up in December of 2018 and takes 7 years. The civil engineering and infrastructure are being constructed on time schedule and will be completed in July, 2023. R&D on key accelerator techniques are going on successfully, and prototypes of core devices are fabricated in collaboration with home and abroad universities, institutes, and companies. Presently, we come to the stage of invitation for bids and volume production of various apparatuses. We plan to start facility installation in summer of 2023. As a scientific user facility opening to domestic and oversea researchers, HIAF user community plays key roles in defining research programs and raising requirements. We call upon expertise, aspirations, and resources of a host of collaborators. Collaborations, dedicated to specific research subjects, are established and will be established. These collaborations develop new experimental techniques and methods and take responsibility for design and building of measurement systems. We have completed the design of experimental setups. A new gas-filled recoil separator and a novel storage-ring-based isochronous mass spectrometer are already built, and other measurement systems are under construction. The facility commissioning is scheduled at the end in the year of 2025. After into operation of the 2.5 billion Chinese yuan HIAF, this world-class facility will ensure the nation’s continued competitiveness in heavy-ion physics and technology through provision of outstanding discovery potential. Based on HIAF, we aim at establishing a world’s leading laboratory for research and education in nuclear science, accelerator physics and technology, and applications of energetic heavy ions to meet societal needs. In this paper, progress and status of civil engineering and infrastructure construction of HIAF are introduced, R&D on critical accelerator techniques and prototypes of core devices as well as development of new experimental techniques and methods are presented, and design and construction of experimental setups and the associated physics research programs are briefly depicted.

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Dielectronic and Trielectronic Recombination Rate Coefficients of Be-like Ar ¹⁴⁺

Abstract: 16Electron-ion recombination of Be-like 40

Cited by 35 publications

References 44 publications

Relativistic eigenchannelR-matrix studies of the strong intrashell electron correlations in highly chargedAr13+ions

Relativistic eigenchannelR-matrix studies of the strong intrashell electron correlations in highly chargedAr13+ions

Dielectronic recombination at low energy range with Boron‐like Ar¹³⁺at the CSRm

Status of the high-intensity heavy-ion accelerator facility in China

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Dielectronic and Trielectronic Recombination Rate Coefficients of Be-like Ar 14+

Abstract: 16Electron-ion recombination of Be-like 40

Cited by 35 publications

References 44 publications

Relativistic eigenchannelR-matrix studies of the strong intrashell electron correlations in highly chargedAr13+ions

Relativistic eigenchannelR-matrix studies of the strong intrashell electron correlations in highly chargedAr13+ions

Dielectronic recombination at low energy range with Boron‐like Ar13+at the CSRm

Status of the high-intensity heavy-ion accelerator facility in China

Contact Info

Product

Resources

About

Dielectronic and Trielectronic Recombination Rate Coefficients of Be-like Ar ¹⁴⁺

Dielectronic recombination at low energy range with Boron‐like Ar¹³⁺at the CSRm