核心期刊
《Nuclear Science and Techniques》（简称NST），1990年创刊，由中国科学院上海应用物理研究所和中国核学会共同主办的英文同行评议期刊，主编马余刚院士，出版周期为月刊，被SCI-E、EI、CSCD等数据库收录。《NST》通过介绍国内外最新核科技成果促进国内外核科学与技术领域科学家之间的学术交流。期刊主要学术方向为：核物理与交叉学科；同步辐射技术及应用；加速器技术、射线技术及应用；核化学、放射化学、放射性药物和核医学；核电子学与仪器；核能科学与工程等。
关键词: Beam correction; Injection transfer beamline; Machine learning; Beam dynamics; Invertible neural network;
DOI：10.12074/202503.00066
提交时间： 2025-03-10
摘要： As a fourth-generation synchrotron radiation light source working at 1.5 GeV, Wuhan Advanced Light Source (WALS) is being designed, which uses a full-energy linear accelerator (LINAC) as its electron beam injector. The injection beamline adopts a three-stage scheme: firstly, the beam from the LINAC that is 6 m under the storage ring is horizontally deflected below the storage ring, then it gradually climbs from underground to the same altitude as the storage ring, and finally the beam is delivered horizontally into the injection straight section inside the storage ring. Meanwhile, the Twiss parameter matching between the LINAC and storage ring is completed. During the construction of the beamline, magnet manufacturing errors, installation errors and beam injection errors from the LINAC will cause beam deviations from predetermined ideal orbits, and even particle losses. As a result, the electron beam correction is required during beam commissioning. Different from the single-direction beam correction of general transfer lines, the horizontal and vertical directions of the beam are coupled in the WALS injection transfer line, which greatly increases the complexity and difficulty of beam correction. Machine learning technology has been developed extensively in recent years, and its powerful algorithm of invertible neural network model is expected to be able to solve the beam commissioning difficulty of the beam injection transfer line at the WALS. Therefore, an invertible neural network model has been designed and trained to simulate the beam transport and beam correction of the WALS injection beamline. By optimizing the number and location of beam profile diagnostics, the accuracy of bidirectional prediction and beam correction effect can be greatly improved. The method is of great practical significance for the commissioning and operation of similar complex beam transport systems.
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关键词: Keywords:; Superheavy; nuclei; ; Dinuclear; system; model; ; Heavy-ion; fusion;
DOI：10.12074/202503.00065
提交时间： 2025-03-08
摘要：This paper provides a comprehensive analysis of all stages of the heavy-ion fusion evaporation reaction,
aiming to enhance the understanding of the entire process and identify the influencing factors in calculating
the evaporation residue cross-section. By focusing on the synthesis of superheavy nuclei with Z = 114, we
discuss the capture cross-section, fusion probability, and survival probability of the 48Ca + 244 Pu reaction and
compare them with those of the 40Ar+ 248 Cm reaction. Moreover, a systematic study examined the evaporation
residue cross-sections for the synthesis of superheavy nuclei with Z = 112 − 116 using 40Ar as the projectile
nucleus. The results indicate that utilizing 40Ar as the projectile nucleus for synthesizing isotopes with Z = 114
offers advantages such as lower incident energy and reduced experimental costs. Furthermore, using 40Ar as
the projectile nucleus enables the synthesis of a new key isotope, 285115, thereby facilitating its identification.
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关键词: Light nuclei; chemical freeze-out; RHIC energy;
DOI：10.12074/202502.00167
提交时间： 2025-02-26
摘要：This study investigates the chemical freeze-out of hadrons, including light-flavor, strange-flavor particles, and light nuclei, produced in Au+Au collisions at the Relativistic Heavy Ion Collider (RHIC). Utilizing the Thermal-FIST thermodynamic statistical model, we analyzed various particle sets: those inclusive of light nuclei, those exclusive of light nuclei, and those solely comprising light nuclei. We have determined the chemical freeze-out parameters at $\sqrt{s_\text{NN}}=$7.7-200 GeV and four centralities. A significant finding was a decrease in the chemical freeze-out temperature $T_{\textrm{ch}}$ upon the inclusion of light nuclei, with an even more pronounced reduction when considering light nuclei yields exclusively. This indicates that light nuclei formation occurs at a later stage in the system’s evolution at RHIC energies. We present parameterized formulas that describe the energy dependence of the chemical freeze-out temperature $T_{\textrm{ch}}$ and baryon chemical potential $\mu_B$ for three distinct particle sets in central Au+Au collisions at RHIC energies. Our results reveal the presence of at least three distinct freeze-out hyper-surfaces at RHIC energies, corresponding to different chemical freeze-out temperatures: a light flavor freeze-out temperature of $T_L$=150.2$\pm$6 MeV, a strange flavor freeze-out temperature $T_s$=165.1$\pm$2.7 MeV, and a light nuclei freeze-out temperature $T_{\textrm{ln}}$=141.7$\pm$1.4 MeV. Notably, at the Large Hadron Collider (LHC) energies, the expected lower freeze-out temperature for light nuclei was not observed. Instead, the chemical freeze-out temperature for light nuclei was found to be approximately 10 MeV higher than that for light flavor hadrons. This discrepancy may suggest different production mechanisms for light nuclei between RHIC and LHC energies.
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280
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关键词: Strange quark star; Gravitational wave echoes; Color-favour-locked phase; Strange quark matter;
DOI：10.12074/202401.00154V1
提交时间： 2024-01-09
摘要：According to the recent studies, the gravitational wave (GW) echoes are expected to be generated by quark stars composed of ultrastif quark matter. The ultrastif equations of state (EOS) for quark matter were usually obtained either by a simple bag model with artifcially assigned sound velocity or by employing interacting strange quark matter (SQM) depicted by simple reparameterization and rescaling. In this study, we investigate GW echoes with EOSs for SQM in the framework of the equivparticle model with density-dependent quark masses and pairing efects. We conclude that strange quark stars (SQSs) can be sufciently compact to possess a photon sphere capable of generating GW echoes with frequencies in the range of approximately 20 kHz. However, SQSs cannot account for the observed 72 Hz signal in GW170817 event. Furthermore, we determined that quark-pairing efects play a crucial role in enabling SQSs to satisfy the necessary conditions for producing these types of echoes.
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关键词: BESIII tracking detector; CMOS pixel sensor; Track reconstruction; Common tracking software;
DOI：10.12074/202311.00216V3
提交时间： 2023-12-13
摘要：The reconstruction of the tracks of charged particles with high precision is crucial for HEP experiments to
achieve their physics goals. The BESIII drift chamber, which is used as the tracking detector of the BESIII
experiment, has suffered from aging effects resulting in degraded tracking performance after operation for ap-
proximately 15 years. To preserve and enhance the tracking performance of BESIII, one of the proposals is to
add one layer of a thin cylindrical CMOS pixel sensor based on state-of-the-art stitching technology between
the beam pipe and the drift chamber. The improvement in the tracking performance of BESIII with such an
additional pixel detector compared to that with only the existing drift chamber was studied using the modern
common tracking software ACTS , which provides a set of detector-agnostic and highly performant tracking
algorithms that h
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关键词: Molecular dynamics method; Displacement cascade; Ni-Mo alloy;
DOI：dx.doi.org/10.13538/j.1001-8042/nst.26.060603
提交时间： 2023-06-18
摘要：Molecular dynamics method is used to investigate the displacement cascades in Ni-Mo binary alloy. Effects of the irradiation temperature, energy of the primary knock-on atoms and concentration of solute Mo atoms are taken into consideration on radiation damage to the Ni-Mo alloy. It is found that Mo atoms reduce production of the Frenkel pairs at 100 K, while they enhance defect production at 300 K and 600 K. Size of the largest defect clusters decreases with increasing concentrations of Mo atoms (CMo) at 100 K, but it increases with CMo at 300 K and 600 K. Most of the point defects get clustered in cascades leaving only a few vacancies and interstitials isolated.
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关键词: FLiNaK; Cr; Corrosion product; K2NaCrF6;
DOI：dx.doi.org/10.13538/j.1001-8042/nst.26.060602
提交时间： 2023-06-18
摘要：To investigate the corrosion products of Cr in molten FLiNaK salt (46.5 mol% LiF–11.5 mol% NaF–42 mol% KF), the corrosion test of the pure metal Cr was performed in molten FLiNaK salt at 700 ℃ for 200 h. The FLiNaK salt after the corrosion test was thoroughly investigated by X-ray absorption near-edge structure spectroscopy, a transmission electron microscope, and X-ray diffraction. The results demonstrate that the predominant oxidation state of Cr in FLiNaK salt is Cr3+, and the main corrosion product in cooled FLiNaK salt is K2NaCrF6.
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关键词: Steam generator tube rupture; Molten LBE; Fragmentation; Steam explosion; Interfacial instability;
DOI：dx.doi.org/10.13538/j.1001-8042/nst.26.060601
提交时间： 2023-06-18
摘要：Based on the design of CLEAR (China LEAd-based Reactor), it is important to study the molten LBE (Lead-Bismuth Eutectic)/water interaction following an incidental steam generator tube rupture (SGTR) accident. Experiments were carried out to investigate the fragmentation behavior of the molten LBE/water contacting interface, with a high-speed video camera to record the fragmentation behavior of 300–600 ℃ LBE at 20 ℃ and 80 ℃ of water temperature. Violent explosion phenomenon occurred at water temperature of 20 ℃, while no explosion occurred at 80 ℃. Shapes of the LBE debris became round at 80 ℃ of water temperature, whereas the debris was of the needle-like shape at 20 ℃. For all the molten LBE and water temperatures in the present study, the debris sized at 2.8–5.0 mm had the largest mass fraction. The results indicate that the dominant physical mechanism of the molten LBE fragmentation was the Kelvin-Helmholtz instability between LBE/water direct contact interface.
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关键词: Electrochemical sensor; Microelectrode; Dopamine detection; Ascorbic acid;
DOI：dx.doi.org/10.13538/j.1001-8042/nst.26.060504
提交时间： 2023-06-18
摘要：In this paper, a novel method for selectively detection of dopamine (DA) in the interference of ascorbic acid (AA) is described. A nanometer-sized gold flower microelectrode (NGFME) is prepared by flame-etching and electrochemical deposition. The electrode tip was characterized by scanning electron microscope (SEM). The NGFME is sized at about 100 μm and dimensions of thorns of the electrode were in nanometers. By modifying with DA aptamer on the surface, the prepared aptasensor can selectively detect DA even in the presence of high concentration AA. Experimental results show that this NGFME has no response to AA. As a comparison, the carbon fiber electrode without DA aptamer modification is unable to effectively detect DA in the presence of AA. The NGFME is easy-to-prepare, selective and sensitive for DA detection down to 25 μm. The electrode can be expected to detect DA in vivo and in real biological samples.
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关键词: Heat shock protein 90; N-terminal domain; Inhibitor; X-ray diffraction; Interactions;
DOI：dx.doi.org/10.13538/j.1001-8042/nst.26.060503
提交时间： 2023-06-18
摘要：The N-terminal domain of heat shock protein 90 (Hsp90N) is responsible for the catalytic activity of Hsp90. The reported inhibitors of Hsp90 bind to this domain and would inhibit tumor growth and progression. Here, we synthesized FS23, a small molecule inhibitor of hsp90 and collected X-ray diffraction data of the complex crystal of Hsp90-FS23. High resolution X-ray crystallography shows that FS23 interacted with Hsp90N at the nucleotide binding cleft, and this suggests that FS23 may complete with nucleotides to bind to Hsp90N. The crystal structure and the interaction between Hsp90N and FS23 suggest a rational basis for the design of novel antitumor drugs.
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