2023 Vol. 40, No. 1
Display Method:
2023, 40(1): 1-9.
doi: 10.11804/NuclPhysRev.40.2022095
Abstract:
Based on the deformed nucleon distributions obtained from the constrained Skyrme-Hartree-Fock-Bogolyubov calculation using different nuclear symmetry energies, we have investigated the effects of the neutron skin and the collision geometry on the yield of free spectator nucleons as well as the yield ratio\begin{document}$N_{\rm{n}}^{}/N_{\rm{p}}^{}$\end{document} ![]()
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\begin{document}$N_{\rm{n}}^{}/N_{\rm{p}}^{}$\end{document} ![]()
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\begin{document}$N_{\rm{n}}^{}/N_{\rm{p}}^{}$\end{document} ![]()
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Based on the deformed nucleon distributions obtained from the constrained Skyrme-Hartree-Fock-Bogolyubov calculation using different nuclear symmetry energies, we have investigated the effects of the neutron skin and the collision geometry on the yield of free spectator nucleons as well as the yield ratio
2023, 40(1): 10-16.
doi: 10.11804/NuclPhysRev.40.2022057
Abstract:
In this article, the incident energy dependence of transverse flow from the collisions of\begin{document}$^{64}{\rm{Zn}} $\end{document} ![]()
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\begin{document}$^{58}{\rm{Ni}} $\end{document} ![]()
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\begin{document}$^{64}{\rm{Zn}} $\end{document} ![]()
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\begin{document}$^{58}{\rm{Ni}} $\end{document} ![]()
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\begin{document}$(110.1\pm5.8)$\end{document} ![]()
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\begin{document}$(128.0\pm5.6)$\end{document} ![]()
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In this article, the incident energy dependence of transverse flow from the collisions of
2023, 40(1): 17-24.
doi: 10.11804/NuclPhysRev.40.2022048
Abstract:
The study of exotic nuclei is one of the most interesting frontier topics in nuclear physics. There are relatively few studies on the existence of halo in medium-mass nuclei. The complex momentum representation(CMR) method can be used to explore exotic structures in nuclei. The resonant states near the continuum threshold play an important role in the formation of exotic phenomena. Therefore, the relativistic point coupled and the complex momentum representation (RMFPC-CMR) method is used to explore the exotic structures for the neutron-rich Cr isotopes. The two-neutron separation energies have been calculated to be very close to zero, and the mean square (rms) radii of neutron also have increased sharply, implying the presence of halo structures in the Cr isotopes near the neutron drip line. The single-particle levels, the occupation probabilities of valence nucleons on the levels near the Fermi surface, the neutron and proton density distributions, and the contribution of every level to the nucleus density are obtained, it can be found that the occupations of the levels\begin{document}$ 3{s_{1/2}} $\end{document} ![]()
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\begin{document}$ 2{d_{3/2}} $\end{document} ![]()
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The study of exotic nuclei is one of the most interesting frontier topics in nuclear physics. There are relatively few studies on the existence of halo in medium-mass nuclei. The complex momentum representation(CMR) method can be used to explore exotic structures in nuclei. The resonant states near the continuum threshold play an important role in the formation of exotic phenomena. Therefore, the relativistic point coupled and the complex momentum representation (RMFPC-CMR) method is used to explore the exotic structures for the neutron-rich Cr isotopes. The two-neutron separation energies have been calculated to be very close to zero, and the mean square (rms) radii of neutron also have increased sharply, implying the presence of halo structures in the Cr isotopes near the neutron drip line. The single-particle levels, the occupation probabilities of valence nucleons on the levels near the Fermi surface, the neutron and proton density distributions, and the contribution of every level to the nucleus density are obtained, it can be found that the occupations of the levels
2023, 40(1): 25-30.
doi: 10.11804/NuclPhysRev.40.2022051
Abstract:
The local correlation between the electric quadrupole moments of\begin{document}$2_1^+$\end{document} ![]()
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\begin{document}$N_{\rm{p}}N_{\rm{n}}$\end{document} ![]()
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\begin{document}$2_1^+$\end{document} ![]()
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\begin{document}$N_{\rm{p}}N_{\rm{n}}$\end{document} ![]()
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The local correlation between the electric quadrupole moments of
2023, 40(1): 31-35.
doi: 10.11804/NuclPhysRev.40.2022053
Abstract:
Accuracy and predictive power of two global models to predict nuclear charge radius are significantly improved combined with the radial basis function(RBF) approach. The root-mean-square(rms) deviation of Skyrme Hartree-fock-Bogoliubov(HFB25) model is reduced from 0.025 to 0.018 fm, using 885 experimental data of the nuclear charge radius to leave-one-out cross validation, the rms deviation of a formula proposed based on the shell correction energies and deformation parameters given by the Weizäcker-Skyrme(WS*) nuclear mass model is reduced from 0.022 to 0.017 fm. For the latest 144 experimental data, the rms deviations of HFB25 and WS* models combined with RBF approach are only 0.015 fm. With the RBF approach, by studying the correction degree of prediction values of HFB25 and WS* models in the superheavy region, it is found that the correction degree of WS* model in the superheavy region can be kept within 0.1 fm, while the correction degree of HFB25 model in the superheavy region is more than 0.1 fm. This is very useful for analyzing model errors and further improving the prediction accuracy of nuclear charge radius.
Accuracy and predictive power of two global models to predict nuclear charge radius are significantly improved combined with the radial basis function(RBF) approach. The root-mean-square(rms) deviation of Skyrme Hartree-fock-Bogoliubov(HFB25) model is reduced from 0.025 to 0.018 fm, using 885 experimental data of the nuclear charge radius to leave-one-out cross validation, the rms deviation of a formula proposed based on the shell correction energies and deformation parameters given by the Weizäcker-Skyrme(WS*) nuclear mass model is reduced from 0.022 to 0.017 fm. For the latest 144 experimental data, the rms deviations of HFB25 and WS* models combined with RBF approach are only 0.015 fm. With the RBF approach, by studying the correction degree of prediction values of HFB25 and WS* models in the superheavy region, it is found that the correction degree of WS* model in the superheavy region can be kept within 0.1 fm, while the correction degree of HFB25 model in the superheavy region is more than 0.1 fm. This is very useful for analyzing model errors and further improving the prediction accuracy of nuclear charge radius.
2023, 40(1): 36-44.
doi: 10.11804/NuclPhysRev.40.2022029
Abstract:
The study of the internal structure of nucleons is an important frontier of current theoretical and experimental research. The high-energy scattering experiments are ideal tools for exploring the structure of nucleons. A Polarized Electron Ion Collider(EicC) is proposed based on High Intensity heavy-ion Accelerator Facility(HIAF) by Institute of Modern Physics, Chinese Academy of Sciences. EicC will provide polarized electron and proton beams with a center-of-mass energy of\begin{document}$15 \sim 20$\end{document} ![]()
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\begin{document}$2\times10^{33}\ {{\rm{cm}}^{-2}{\rm{s}}^{-1}}$\end{document} ![]()
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The study of the internal structure of nucleons is an important frontier of current theoretical and experimental research. The high-energy scattering experiments are ideal tools for exploring the structure of nucleons. A Polarized Electron Ion Collider(EicC) is proposed based on High Intensity heavy-ion Accelerator Facility(HIAF) by Institute of Modern Physics, Chinese Academy of Sciences. EicC will provide polarized electron and proton beams with a center-of-mass energy of
2023, 40(1): 45-50.
doi: 10.11804/NuclPhysRev.40.2022032
Abstract:
The space charge effect is one of the key factors affecting ion beam transport and ion beam quality, especially for low-energy high-intensity ion beams. It can be partially compensated by the secondary electrons, which are produced from the ionization of residual gas molecules in the beam pipe and trapped by the space charge potential of ion beams. To study high intensity beam transport in low energy section, it is essential to have an accurate value of space charge compensation degree(SCCD) of the beam, particularly for mixed ion beams. Using a three-grid energy analyzer and a beam profile monitor based on an 128-channel picoammeter system, we measured the secondary ion energy distribution and the beam current distribution of mixed oxygen ion beams of different beam intensities and beam distributions, respectively. Thus the SCCD of the beams can be calculated. The results show that for mixed oxygen ion beams of different intensities, the SCCD are basically around 70% under the vacuum of 1.0×10−5 Pa; The space charge potential of the beams are affected greatly by the beam current distributions, which also consequently have influence on the SCCD of the ion beams.
The space charge effect is one of the key factors affecting ion beam transport and ion beam quality, especially for low-energy high-intensity ion beams. It can be partially compensated by the secondary electrons, which are produced from the ionization of residual gas molecules in the beam pipe and trapped by the space charge potential of ion beams. To study high intensity beam transport in low energy section, it is essential to have an accurate value of space charge compensation degree(SCCD) of the beam, particularly for mixed ion beams. Using a three-grid energy analyzer and a beam profile monitor based on an 128-channel picoammeter system, we measured the secondary ion energy distribution and the beam current distribution of mixed oxygen ion beams of different beam intensities and beam distributions, respectively. Thus the SCCD of the beams can be calculated. The results show that for mixed oxygen ion beams of different intensities, the SCCD are basically around 70% under the vacuum of 1.0×10−5 Pa; The space charge potential of the beams are affected greatly by the beam current distributions, which also consequently have influence on the SCCD of the ion beams.
Study on Nb3Sn Coating Technology of 1.3 GHz Superconducting Cavity by Electrochemical Bronze Method
2023, 40(1): 51-57.
doi: 10.11804/NuclPhysRev.40.2022031
Abstract:
Superconducting RF cavities have been widely used in modern accelerators because of their advanced characters, such as high quality factor, large beam aperture etc. After years of development, the performance of bulk Nb cavity is close to the material's theoretical limit. Using Nb3Sn thin film cavities to replace current bulk Nb cavities could be a viable way to break such limit. Because of its high superconducting transition temperature and superheating magnetic field, Nb3Sn can elevate both the working temperature and the acceleration gradient of the SRF cavities. Currently, there are several preparation methods of Nb3Sn thin films under development. Among them, Nb3Sn thin films with decent performance were successfully prepared on the inner surface of Nb cavity by tin vapor diffusion method. However, because the reaction temperature is above 1 100 °C, tin vapor diffusion method cannot get rid of bulk niobium substrate, so it inevitably has defects in mechanical stability, thermal conductivity and other aspects, which is difficult to meet the application of high reliability accelerator in the future. Bronze method have been successfully used for Nb3Sn cable preparation. The maximum heat treatment temperature of this method is under 700 °C, which can potentially be applied to copper-based Nb3Sn thin film cavity preparation. In addition, electrochemical coating method is also considered because of its advantages, such as low cost, easy control of reaction process, normal temperature and pressure. In this work, we combined the advantages of above two methods. Specifically, on 1.3 GHz Nb based cavity, bronze precursor films were prepared by electrochemical plating firstly, and then were heated to synthesize Nb3Sn thin film by annealing. The vertical test results show that the intrinsic\begin{document}$Q_{0}^{}$\end{document} ![]()
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\begin{document}$6 \times 10^{8}$\end{document} ![]()
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Superconducting RF cavities have been widely used in modern accelerators because of their advanced characters, such as high quality factor, large beam aperture etc. After years of development, the performance of bulk Nb cavity is close to the material's theoretical limit. Using Nb3Sn thin film cavities to replace current bulk Nb cavities could be a viable way to break such limit. Because of its high superconducting transition temperature and superheating magnetic field, Nb3Sn can elevate both the working temperature and the acceleration gradient of the SRF cavities. Currently, there are several preparation methods of Nb3Sn thin films under development. Among them, Nb3Sn thin films with decent performance were successfully prepared on the inner surface of Nb cavity by tin vapor diffusion method. However, because the reaction temperature is above 1 100 °C, tin vapor diffusion method cannot get rid of bulk niobium substrate, so it inevitably has defects in mechanical stability, thermal conductivity and other aspects, which is difficult to meet the application of high reliability accelerator in the future. Bronze method have been successfully used for Nb3Sn cable preparation. The maximum heat treatment temperature of this method is under 700 °C, which can potentially be applied to copper-based Nb3Sn thin film cavity preparation. In addition, electrochemical coating method is also considered because of its advantages, such as low cost, easy control of reaction process, normal temperature and pressure. In this work, we combined the advantages of above two methods. Specifically, on 1.3 GHz Nb based cavity, bronze precursor films were prepared by electrochemical plating firstly, and then were heated to synthesize Nb3Sn thin film by annealing. The vertical test results show that the intrinsic
2023, 40(1): 58-65.
doi: 10.11804/NuclPhysRev.40.2022040
Abstract:
Nuclear resonance fluorescence(NRF) experiments can be used to study the low excitation energy levels of photonuclear reactions. Shanghai Laser Electron Gamma Source(SLEGS) designed and constructed a NRF spectrometer consisting of two large-scale coaxial high-purity germanium(HPGe,\begin{document}$\phi $\end{document} ![]()
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\begin{document}$\phi $\end{document} ![]()
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Nuclear resonance fluorescence(NRF) experiments can be used to study the low excitation energy levels of photonuclear reactions. Shanghai Laser Electron Gamma Source(SLEGS) designed and constructed a NRF spectrometer consisting of two large-scale coaxial high-purity germanium(HPGe,
2023, 40(1): 66-72.
doi: 10.11804/NuclPhysRev.40.2022108
Abstract:
In order to fulfill the requirements of the engineering material diffraction spectrometer of China Spallation Neutron Source(CSNS), a new integrated and modular scintillator detector based on Silicon Photomultiplier(SiPM) readout is designed and constructed by the Neutron Detector Group of the CSNS. In this paper, the characteristics such as breakdown voltage, gain, temperature characteristics and dark count rate of Sensl MicroFJ-30035-TSV and Hamamatsu S13363-3050NE-16 model SiPM are tested. The results show that the performance of the two SiPM including the single-photon resolution, gain, dark count rate can meet the requirements of the scintillator detector. The gain of Sensl SiPM is higher than that of Hamamatsu SiPM in the same overbias and the latter is more sensitive to temperature. The temperature compensation coefficient of the Sensl and Hamamatsu SiPM are 22.0 and 53.6 mV/°C respectively, which will provide reference for the design of temperature compensation circuit of SiPM. The prototype of a scintillator detector based on the above two SiPM readout was developed and the detection efficiency of the detector has been tested on the BL09 of CSNS. The results show that the detection efficiency of detector equipped with Sensl SiPM or Hamamatsu SiPM is 76% and 68% for 2.8 Å neutrons, respectively. The results of this paper will provide reference for the selection of SiPM for the developed scintillator detector and other SiPM-based detectors.
In order to fulfill the requirements of the engineering material diffraction spectrometer of China Spallation Neutron Source(CSNS), a new integrated and modular scintillator detector based on Silicon Photomultiplier(SiPM) readout is designed and constructed by the Neutron Detector Group of the CSNS. In this paper, the characteristics such as breakdown voltage, gain, temperature characteristics and dark count rate of Sensl MicroFJ-30035-TSV and Hamamatsu S13363-3050NE-16 model SiPM are tested. The results show that the performance of the two SiPM including the single-photon resolution, gain, dark count rate can meet the requirements of the scintillator detector. The gain of Sensl SiPM is higher than that of Hamamatsu SiPM in the same overbias and the latter is more sensitive to temperature. The temperature compensation coefficient of the Sensl and Hamamatsu SiPM are 22.0 and 53.6 mV/°C respectively, which will provide reference for the design of temperature compensation circuit of SiPM. The prototype of a scintillator detector based on the above two SiPM readout was developed and the detection efficiency of the detector has been tested on the BL09 of CSNS. The results show that the detection efficiency of detector equipped with Sensl SiPM or Hamamatsu SiPM is 76% and 68% for 2.8 Å neutrons, respectively. The results of this paper will provide reference for the selection of SiPM for the developed scintillator detector and other SiPM-based detectors.
2023, 40(1): 73-77.
doi: 10.11804/NuclPhysRev.40.2022021
Abstract:
In this work, a compact phoswich detector consisting of a cylindrical LaBr3(Ce) principal crystal and a well-shaped CsI(Tl) sub-crystal was designed and assembled to identify and reject Compton scattering in the LaBr3(Ce). Two different crystals coupled to the same photomultiplier tube (PMT). The energy deposition in each layer from incident radiation is then determined via digital pulse shape analysis of the PMT’s pulses. The results of Geant4 simulations were used to verify the performance of the pulse shape identification and the effect of Compton background suppression. Experimental tests were conducted on the detector prototype using a 60Co gamma source, and the result shown that the detector background suppression coefficient was 2.33(1) which achieved the expected purpose of twice as much as the Compton background was suppressed.
In this work, a compact phoswich detector consisting of a cylindrical LaBr3(Ce) principal crystal and a well-shaped CsI(Tl) sub-crystal was designed and assembled to identify and reject Compton scattering in the LaBr3(Ce). Two different crystals coupled to the same photomultiplier tube (PMT). The energy deposition in each layer from incident radiation is then determined via digital pulse shape analysis of the PMT’s pulses. The results of Geant4 simulations were used to verify the performance of the pulse shape identification and the effect of Compton background suppression. Experimental tests were conducted on the detector prototype using a 60Co gamma source, and the result shown that the detector background suppression coefficient was 2.33(1) which achieved the expected purpose of twice as much as the Compton background was suppressed.
2023, 40(1): 78-85.
doi: 10.11804/NuclPhysRev.40.2022022
Abstract:
In accelerator particle physics experiments, it is a development trend to realize the functions of analog signal processing and digitization at the front end of readout electronics based on application specific integrated circuits(ASICs), but it also exposes ASICs in the radiation environment of high-energy particles, The static random access memory(SRAM) is vulnerable to radiation, resulting in single event upset(SEU), which makes the chip abnormal. Therefore, it is necessary to design radiation-hardened SRAM in those ASICs. In this paper, a SEU-tolerant SRAM memory cell with 11 transistors(11 T) based on Schmitt trigger is proposed. The circuit is designed and simulated in 180 nm CMOS process. The simulation results show that our proposed 11 T SRAM cells as compared with traditional 12 transistors(12 T) SRAM cell have considerably higher robustness against single-event multiple effects, and consumes only 42% power of the 12 T cell.
In accelerator particle physics experiments, it is a development trend to realize the functions of analog signal processing and digitization at the front end of readout electronics based on application specific integrated circuits(ASICs), but it also exposes ASICs in the radiation environment of high-energy particles, The static random access memory(SRAM) is vulnerable to radiation, resulting in single event upset(SEU), which makes the chip abnormal. Therefore, it is necessary to design radiation-hardened SRAM in those ASICs. In this paper, a SEU-tolerant SRAM memory cell with 11 transistors(11 T) based on Schmitt trigger is proposed. The circuit is designed and simulated in 180 nm CMOS process. The simulation results show that our proposed 11 T SRAM cells as compared with traditional 12 transistors(12 T) SRAM cell have considerably higher robustness against single-event multiple effects, and consumes only 42% power of the 12 T cell.
2023, 40(1): 86-91.
doi: 10.11804/NuclPhysRev.40.2022076
Abstract:
In the early stage, parallel bus architecture, such as VME and PXI bus, is widely used in the data transmission system of detector devices at home and abroad. However, with the development of nuclear physics experiments and the improvement of the speed of data transmission, the drawbacks of the difficulty in speeding up the parallel bus gradually appear. The data can not be transmitted through the backplane due to the low bus speed. In this paper, we design a new advanced data transmission Advanced Mezzanine Card(AMC) signal processing card based on Micro Telecom Computing Architecture(MicroTCA). A high-speed PCIe serial bus which has significant advantages in speed improvement is used in the backplane bus of the AMC signal processing card. The transmission function of the whole transmission link is tested and verified to be correct and the fiber error rate of the link transmission is lower than 7.62×10−15. The transmission speed is also close to the theoretical extreme, reaching 430 MB/s. Finally, the AMC signal processing card and front-end electronics are tested jointly, and the validity of the system is verified.
In the early stage, parallel bus architecture, such as VME and PXI bus, is widely used in the data transmission system of detector devices at home and abroad. However, with the development of nuclear physics experiments and the improvement of the speed of data transmission, the drawbacks of the difficulty in speeding up the parallel bus gradually appear. The data can not be transmitted through the backplane due to the low bus speed. In this paper, we design a new advanced data transmission Advanced Mezzanine Card(AMC) signal processing card based on Micro Telecom Computing Architecture(MicroTCA). A high-speed PCIe serial bus which has significant advantages in speed improvement is used in the backplane bus of the AMC signal processing card. The transmission function of the whole transmission link is tested and verified to be correct and the fiber error rate of the link transmission is lower than 7.62×10−15. The transmission speed is also close to the theoretical extreme, reaching 430 MB/s. Finally, the AMC signal processing card and front-end electronics are tested jointly, and the validity of the system is verified.
2023, 40(1): 92-98.
doi: 10.11804/NuclPhysRev.40.2022011
Abstract:
Nanofiltration membranes are playing more and more important roles in the fields of sea water desalination and drinking water purification. The ion track membrane (ITM), as a kind of important separation membrane with uniform pore size, regulable pore density, and free-defect surface, has potential permission in water treatments and precise separation. The thin ITMs with high pore density as substrates have great potential in the preparation of high-performance nanofiltration membranes. Herein, we report a triple-layered organic-inorganic composite membrane with zirconia (ZrO2) as a selective layer and polyethylene terephthalate ion track membrane (PET ITM) as support. The polydopamine (PDA)-polyethyleneimine (PEI) intermediate coating facilitates inorganic nanoparticles to form an inorganic layer on the membrane surfaces. The composite membrane can achieve partial rejection for various kinds of salts and exhibit a salt retention order of Na2SO4>MgSO4>MgCl2>NaCl.
Nanofiltration membranes are playing more and more important roles in the fields of sea water desalination and drinking water purification. The ion track membrane (ITM), as a kind of important separation membrane with uniform pore size, regulable pore density, and free-defect surface, has potential permission in water treatments and precise separation. The thin ITMs with high pore density as substrates have great potential in the preparation of high-performance nanofiltration membranes. Herein, we report a triple-layered organic-inorganic composite membrane with zirconia (ZrO2) as a selective layer and polyethylene terephthalate ion track membrane (PET ITM) as support. The polydopamine (PDA)-polyethyleneimine (PEI) intermediate coating facilitates inorganic nanoparticles to form an inorganic layer on the membrane surfaces. The composite membrane can achieve partial rejection for various kinds of salts and exhibit a salt retention order of Na2SO4>MgSO4>MgCl2>NaCl.
2023, 40(1): 99-105.
doi: 10.11804/NuclPhysRev.40.2022015
Abstract:
Nanocones with asymmetric shapes and linearly reduced sizes possess a huge application prospect in the field of wide spectrum response. Single nanocones have great potential for the enhanced absorption/scattering and for the surface-enhanced spectroscopy caused by the excitation of surface plasmon. In this work, free-standing single gold nanocones with gradient diameter were fabricated by swift heavy ion irradiation on polymeric templates, followed by latent track etching and electrodeposition processes. The morphology and structure characterizations were performed, included scanning electron microscopy, transmission electron microscopy and optical dark-field imaging. Further dark-field scattering spectrometry results showed that the single gold nanocones have broadband response and multiple polarization modes. In addition, FDTD (the finite-difference time-domain) simulations revealed the mechanisms beneath the broadband plasmonic responses, which are attributed to the variation of surface plasmon resonance modes as a function of the gradually changed diameters of gold nanocone. This work provides an innovative method for the fabrication of high-quality gold nanocones, and also provides systematic theoretical and experimental evidence for the in-depth study of the broadband response properties of single metallic nanocones.
Nanocones with asymmetric shapes and linearly reduced sizes possess a huge application prospect in the field of wide spectrum response. Single nanocones have great potential for the enhanced absorption/scattering and for the surface-enhanced spectroscopy caused by the excitation of surface plasmon. In this work, free-standing single gold nanocones with gradient diameter were fabricated by swift heavy ion irradiation on polymeric templates, followed by latent track etching and electrodeposition processes. The morphology and structure characterizations were performed, included scanning electron microscopy, transmission electron microscopy and optical dark-field imaging. Further dark-field scattering spectrometry results showed that the single gold nanocones have broadband response and multiple polarization modes. In addition, FDTD (the finite-difference time-domain) simulations revealed the mechanisms beneath the broadband plasmonic responses, which are attributed to the variation of surface plasmon resonance modes as a function of the gradually changed diameters of gold nanocone. This work provides an innovative method for the fabrication of high-quality gold nanocones, and also provides systematic theoretical and experimental evidence for the in-depth study of the broadband response properties of single metallic nanocones.
2023, 40(1): 106-112.
doi: 10.11804/NuclPhysRev.40.2022030
Abstract:
The dry seeds of oil sunflower were irradiated with the carbon ion beam provided by the Heavy Ion Research Facility(HIRFL) in Lanzhou. To research the effects of carbon ion beam irradiation on the fruiting characters of M1 oil-sunflower, the seedling emergence rate, survival rate, pollen viability, stigma receptivity and seed setting rate under different pollination conditions were measured. The results showed that the seedling emergence rate, survival rate, pollen viability and seed setting rate reduced with the irradiation dose increasing. Compared with control, the emergence rate and survival rate of oil-sunflower decreased by 55.68% and 64.66% after seeds irradiated with a carbon ion dose of 80 Gy. This study also revealed that seeds were irradiated with 20~160 Gy showed very low self-cross seed setting rate, and the mixed-cross seed setting rate were significantly reduced at irradiation of 40~160 Gy. Pollen viability decreased from 92.01% of the CK to 47.59% of the 160 Gy irradiation. With the irradiation dose increasing, the percentage of stigmas with higher receptivity reduced, and the percentage of stigmas with lower receptivity and no receptivity increased. All results indicated that the damage of carbon ion beam irradiation inhibited the fertility of flower organs and reduced the seeding rate. According to the semi-lethal dose of survival rate and the semi-sterile dose of mixed-cross seed setting rate, the recommended irradiation dose range of oil sunflower is 55 to 153 Gy. Our findings may lead to more reference for the selection of suitable irradiation dose for oil sunflower breeding by carbon ion beam irradiation.
The dry seeds of oil sunflower were irradiated with the carbon ion beam provided by the Heavy Ion Research Facility(HIRFL) in Lanzhou. To research the effects of carbon ion beam irradiation on the fruiting characters of M1 oil-sunflower, the seedling emergence rate, survival rate, pollen viability, stigma receptivity and seed setting rate under different pollination conditions were measured. The results showed that the seedling emergence rate, survival rate, pollen viability and seed setting rate reduced with the irradiation dose increasing. Compared with control, the emergence rate and survival rate of oil-sunflower decreased by 55.68% and 64.66% after seeds irradiated with a carbon ion dose of 80 Gy. This study also revealed that seeds were irradiated with 20~160 Gy showed very low self-cross seed setting rate, and the mixed-cross seed setting rate were significantly reduced at irradiation of 40~160 Gy. Pollen viability decreased from 92.01% of the CK to 47.59% of the 160 Gy irradiation. With the irradiation dose increasing, the percentage of stigmas with higher receptivity reduced, and the percentage of stigmas with lower receptivity and no receptivity increased. All results indicated that the damage of carbon ion beam irradiation inhibited the fertility of flower organs and reduced the seeding rate. According to the semi-lethal dose of survival rate and the semi-sterile dose of mixed-cross seed setting rate, the recommended irradiation dose range of oil sunflower is 55 to 153 Gy. Our findings may lead to more reference for the selection of suitable irradiation dose for oil sunflower breeding by carbon ion beam irradiation.
2023, 40(1): 113-120.
doi: 10.11804/NuclPhysRev.40.2022034
Abstract:
Heavy ion irradiation has unique physical and biological characteristics and has been widely applied in crop and bacteria mutation breeding. However, the mechanism underlying heavy ion irradiation mutagenesis is not completely clear. Unlike the conventional X and\begin{document}$ \gamma $\end{document} ![]()
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Heavy ion irradiation has unique physical and biological characteristics and has been widely applied in crop and bacteria mutation breeding. However, the mechanism underlying heavy ion irradiation mutagenesis is not completely clear. Unlike the conventional X and
2023, 40(1): 121-139.
doi: 10.11804/NuclPhysRev.40.2023018
Abstract:
The chart of the nuclides is one of the fundamental tools in nuclear science and technology. In this paper, we present a new two-dimensional chart of the nuclides, which displays up-to-date ground state nuclear properties such as isotopic abundances of stable nuclei, decay modes, half-life of radioactive nuclei, atomic mass error, and other experimental information extracted from the latest atomic mass evaluation AME2020 and NUBASE2020 evaluation of nuclear physics properties. We review the current status and trends in the visualization of nuclear charts, taking the Karlsruher Nuklidkarte as an example. We discuss the brief history and future perspectives of isotope discovery and nuclear chart publication, followed by the design details of our new chart of the nuclides. Additionally, we recommend free and open-source nuclear chart plotting software/websites. Our newly designed chart of the nuclides will be available in printed versions, including a wall chart and an A4-size folded chart for desktop usage. We plan to update the printed charts synchronously with the AME and NUBASE publications. This will ensure that the charts serve as a regular medium for the concise presentation of the NUBASE database.
The chart of the nuclides is one of the fundamental tools in nuclear science and technology. In this paper, we present a new two-dimensional chart of the nuclides, which displays up-to-date ground state nuclear properties such as isotopic abundances of stable nuclei, decay modes, half-life of radioactive nuclei, atomic mass error, and other experimental information extracted from the latest atomic mass evaluation AME2020 and NUBASE2020 evaluation of nuclear physics properties. We review the current status and trends in the visualization of nuclear charts, taking the Karlsruher Nuklidkarte as an example. We discuss the brief history and future perspectives of isotope discovery and nuclear chart publication, followed by the design details of our new chart of the nuclides. Additionally, we recommend free and open-source nuclear chart plotting software/websites. Our newly designed chart of the nuclides will be available in printed versions, including a wall chart and an A4-size folded chart for desktop usage. We plan to update the printed charts synchronously with the AME and NUBASE publications. This will ensure that the charts serve as a regular medium for the concise presentation of the NUBASE database.
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