介绍了上海光源线站工程之一的上海激光电子伽马源(Shanghai Laser Electron Gamma Source,SLEGS)光束线站的建设与试运行情况,在SLEGS装置上可以开展核物理、核天体物理等基础研究、开展伽马辐照、伽马成像及伽马活化等应用研究。SLEG...介绍了上海光源线站工程之一的上海激光电子伽马源(Shanghai Laser Electron Gamma Source,SLEGS)光束线站的建设与试运行情况,在SLEGS装置上可以开展核物理、核天体物理等基础研究、开展伽马辐照、伽马成像及伽马活化等应用研究。SLEGS光束线站在2021年12月通过工艺验收,2022年10月进入到试运行阶段,2023年9月对用户开放运行。SLEGS是国际上首台采用变换碰撞角度连续改变伽马束能量的光束线站,具有最好的能量扫描精度、流强密度以及高效的能量调节能力。试运行阶段SLEGS光束线站重点解决了伽马束能谱和流强的在线监测问题,主要完成了平坦效率谱仪(FED)测量光中子截面的实验方法学研究,以及开展了伽马成像、伽马活化、正电子产生等应用平台的拓展和研究。随着逆康普顿散射技术的发展和应用需求的增加,未来短脉冲、高极化、高通量以及小型化的激光康普顿散射光源将会迎来更好的发展机遇,将在核物理、天体物理、粒子物理、极化物理,以及航空航天、医学检测、能源开发等伽马源应用研究领域发挥重要的作用。展开更多
Photonuclear reactions using a laser Compton scattering(LCS)gamma source provide a new method for producing radioisotopes for medical applications.Compared with the conventional method,this method has the advantages o...Photonuclear reactions using a laser Compton scattering(LCS)gamma source provide a new method for producing radioisotopes for medical applications.Compared with the conventional method,this method has the advantages of a high specific activity and less heat.Initiated by the Shanghai Laser Electron Gamma Source(SLEGS),we conducted a survey of potential photonuclear reactions,(γ,n),(γ,p),and(γ,γ')whose cross sections can be measured at SLEGS by summarising the experimental progress.In general,the data are rare and occasionally inconsistent.Therefore,theoretical calculations are often used to evaluate the production of medical radioisotopes.Subsequently,we verified the model uncertainties of the widely used reaction code TALYS-1.96,using the experimental data of the^(100)Mo(γ,n)^(99)Mo,^(65)Cu(γ,n)^(64)Cu,and^(68)Zn(γ,p)^(67)Cu reactions.展开更多
The ^(nat)Mo(γ,xnp)^(95m,g)Nb photonuclear reaction was studied using the electron beam from the NSC KIPT linear accelerator LUE-40.The experiment was performed using the activation and off-line γ-ray spectrometric ...The ^(nat)Mo(γ,xnp)^(95m,g)Nb photonuclear reaction was studied using the electron beam from the NSC KIPT linear accelerator LUE-40.The experiment was performed using the activation and off-line γ-ray spectrometric technique.The experimental isomeric yield ratio(IR) was determined for the reaction products ^(95m,g)Nb at the bremsstrahlung end-point energy E_(γmax) range of 38-93 MeV.The obtained values of IR are in satisfactory agreement with the results of other studies and extend the range of previously known data.The theoretical values of the yields Y_(m,g)(E_(γmax)) and the IR for the isomeric pair ^(95m,g)Nb from the ^(nat)Mo(γ,xnp) reaction were calculated using the partial cross-sections σ(E) from the TALYS1.95 code for six different level density models.For the investigated range of E_(γmax),the theoretical dependence of IR on energy was confirmed-the IR smoothly increases with increasing energy.The comparison showed a noticeable difference(more than 3.85 times) in the experimental IR relative to all theoretical estimates.展开更多
Photoneutron cross-section(PNCS)data are important in various current and emerging applications.Although a few sophis-ticated methods have been developed,there is still an urgent need to study the PNCS data.In this st...Photoneutron cross-section(PNCS)data are important in various current and emerging applications.Although a few sophis-ticated methods have been developed,there is still an urgent need to study the PNCS data.In this study,we propose the extraction of PNCS distributions using a combination of gamma activation and reaction yield ratio methods.To verify the validity of the proposed extraction method,experiments for generating^(62,64)Cu and^(85m,87m)Sr isotopes via laser-induced pho-toneutron reactions were performed,and the reaction yields of these isotopes were obtained.Using the proposed extraction method,the PNCS distributions of^(63)Cu and^(86)Sr isotopes(leading to^(85m)Sr isotope production)were successfully extracted.These extracted PNCS distributions were benchmarked against available PNCS data or TALYS calculations,demonstrating the validity of the proposed extraction method.Potential applications for predicting the PNCS distributions of the 30 iso-topes are further introduced.We conclude that the proposed extraction method is an effective complement to the available sophisticated methods for measuring and evaluating PNCS data.展开更多
High energy γ-ray can be used for nuclear waste transmutation by using the giant dipole resonance(GDR). The photonuclear reaction 197Au(γ, n) is known as a standard for studies on photoactivation experiments. The pr...High energy γ-ray can be used for nuclear waste transmutation by using the giant dipole resonance(GDR). The photonuclear reaction 197Au(γ, n) is known as a standard for studies on photoactivation experiments. The previous experiments on 197Au(γ, n) have been performed with bremsstrahlung, positron annihilation in flight or laser Compton scattering γ-ray.In this work, a new mono-energetic γ-ray source based on 13C(p,γ)^14N reaction is used to measure the cross section of 197Au(γ, n) and the measured value is compared with the results obtained with other ways.展开更多
The semiempirical peak energy formulas of the giant dipole resonance doubele peaksfor large deformation regions are reasonably derived in terms of the single peak giant dipoleresonance formula presented by Zeng Jinyan...The semiempirical peak energy formulas of the giant dipole resonance doubele peaksfor large deformation regions are reasonably derived in terms of the single peak giant dipoleresonance formula presented by Zeng Jinyan and Yang Fujia and the nuclear deformationparameter.The peak energies available in the nuclear mass region 50【A【250 can be wellreproduced by using these formulas.展开更多
The neutrons have been captured by Erbium nuclei which were received by using clinical electron linear accelerator. In this experiment, the possibility of the neutron capture process has been observed because of emitt...The neutrons have been captured by Erbium nuclei which were received by using clinical electron linear accelerator. In this experiment, the possibility of the neutron capture process has been observed because of emitted neutrons appearing in the experimental area. In particular,neutron capture of ^(170)Er nucleus has been observed. After the neutron capture of ^(170)Er nucleus, the unstable ^(171)Er has been formed and decayed into the ^(171)Tm. By using this reaction path, some transition energies of ^(171)Tm obtained from the residual activity measurements and the half-life of ^(171)Er have been determined, and they are in agreement with adopted values in the literature.展开更多
The giant dipole resonance parameters of the nuclides <sup>12</sup>C, <sup>14</sup>N, <sup>16</sup>O, <sup>27</sup>Al and <sup>28</sup>Si areextracted by fit...The giant dipole resonance parameters of the nuclides <sup>12</sup>C, <sup>14</sup>N, <sup>16</sup>O, <sup>27</sup>Al and <sup>28</sup>Si areextracted by fitting the Lorentz curves to the experimental data of the photonuclear reactioncross sections and are used to calculate the integrated cross sections, the first moments and thesecond moments of the integrated cross sections of the photonuclear reaction giant dipole reso-nances of these nuclides. Better coincidence of the calculated results with the experimental isreached, confirming the reliability of these parameters.展开更多
Neutron-proton momentum correlation functions are constructed from a three-body photodisintegration channel,i.e.,core+n+p,and used to explore the spatial-time information of the non-clustering Woods-Saxon spherical st...Neutron-proton momentum correlation functions are constructed from a three-body photodisintegration channel,i.e.,core+n+p,and used to explore the spatial-time information of the non-clustering Woods-Saxon spherical structure as well as theα-clustering structures of^12C or^16O based on an extended quantum molecular dynamics model.The emission time sequence of neutrons and protons is indicated by the ratio of velocity-gated neutron-proton correlation functions,demonstrating its sensitivity toα-clustering structures.This work sheds light on a new probe forα-clustering structures.展开更多
计算了电子加速器中不同能量的电子垂直入射到钨靶和金靶上时的光中子产额。采用 Monte Carlo 程序EGS4对电子光子簇在靶中的输运进行模拟 ,计算出光子在靶中的径迹长度 ,从而求出光中子产额。对电子加速器钨靶和金靶中的光中子产额进...计算了电子加速器中不同能量的电子垂直入射到钨靶和金靶上时的光中子产额。采用 Monte Carlo 程序EGS4对电子光子簇在靶中的输运进行模拟 ,计算出光子在靶中的径迹长度 ,从而求出光中子产额。对电子加速器钨靶和金靶中的光中子产额进行了计算 ,得到了电子加速器中光中子产额随打靶电子能量变化的规律及随靶厚度变化的规律 ,为加速器靶和屏蔽系统的设计提供依据 。展开更多
文摘介绍了上海光源线站工程之一的上海激光电子伽马源(Shanghai Laser Electron Gamma Source,SLEGS)光束线站的建设与试运行情况,在SLEGS装置上可以开展核物理、核天体物理等基础研究、开展伽马辐照、伽马成像及伽马活化等应用研究。SLEGS光束线站在2021年12月通过工艺验收,2022年10月进入到试运行阶段,2023年9月对用户开放运行。SLEGS是国际上首台采用变换碰撞角度连续改变伽马束能量的光束线站,具有最好的能量扫描精度、流强密度以及高效的能量调节能力。试运行阶段SLEGS光束线站重点解决了伽马束能谱和流强的在线监测问题,主要完成了平坦效率谱仪(FED)测量光中子截面的实验方法学研究,以及开展了伽马成像、伽马活化、正电子产生等应用平台的拓展和研究。随着逆康普顿散射技术的发展和应用需求的增加,未来短脉冲、高极化、高通量以及小型化的激光康普顿散射光源将会迎来更好的发展机遇,将在核物理、天体物理、粒子物理、极化物理,以及航空航天、医学检测、能源开发等伽马源应用研究领域发挥重要的作用。
基金supported by the National Key R&D Program of China(No.2022YFA1602401)the National Natural Science Foundation of China(Nos.11961141004,U1832211,11922501,12325506)the National Basic Science Data Center‘Medical Physics DataBase’(No.NBSDC-DB-23)。
文摘Photonuclear reactions using a laser Compton scattering(LCS)gamma source provide a new method for producing radioisotopes for medical applications.Compared with the conventional method,this method has the advantages of a high specific activity and less heat.Initiated by the Shanghai Laser Electron Gamma Source(SLEGS),we conducted a survey of potential photonuclear reactions,(γ,n),(γ,p),and(γ,γ')whose cross sections can be measured at SLEGS by summarising the experimental progress.In general,the data are rare and occasionally inconsistent.Therefore,theoretical calculations are often used to evaluate the production of medical radioisotopes.Subsequently,we verified the model uncertainties of the widely used reaction code TALYS-1.96,using the experimental data of the^(100)Mo(γ,n)^(99)Mo,^(65)Cu(γ,n)^(64)Cu,and^(68)Zn(γ,p)^(67)Cu reactions.
文摘The ^(nat)Mo(γ,xnp)^(95m,g)Nb photonuclear reaction was studied using the electron beam from the NSC KIPT linear accelerator LUE-40.The experiment was performed using the activation and off-line γ-ray spectrometric technique.The experimental isomeric yield ratio(IR) was determined for the reaction products ^(95m,g)Nb at the bremsstrahlung end-point energy E_(γmax) range of 38-93 MeV.The obtained values of IR are in satisfactory agreement with the results of other studies and extend the range of previously known data.The theoretical values of the yields Y_(m,g)(E_(γmax)) and the IR for the isomeric pair ^(95m,g)Nb from the ^(nat)Mo(γ,xnp) reaction were calculated using the partial cross-sections σ(E) from the TALYS1.95 code for six different level density models.For the investigated range of E_(γmax),the theoretical dependence of IR on energy was confirmed-the IR smoothly increases with increasing energy.The comparison showed a noticeable difference(more than 3.85 times) in the experimental IR relative to all theoretical estimates.
基金This work was supported by the National Key R&D Program of China(No.2022YFA1603300)the National Natural Science Foundation of China(Nos.U2230133)+2 种基金the Independent Research Project of the Key Laboratory of Plasma Physics,CAEP(No.JCKYS2021212009)the Open Fund of the Key Laboratory of Nuclear Data,CIAE(No.JCKY2022201C152)Hengyang Municipal Science and Technology Project(No.202150054076).
文摘Photoneutron cross-section(PNCS)data are important in various current and emerging applications.Although a few sophis-ticated methods have been developed,there is still an urgent need to study the PNCS data.In this study,we propose the extraction of PNCS distributions using a combination of gamma activation and reaction yield ratio methods.To verify the validity of the proposed extraction method,experiments for generating^(62,64)Cu and^(85m,87m)Sr isotopes via laser-induced pho-toneutron reactions were performed,and the reaction yields of these isotopes were obtained.Using the proposed extraction method,the PNCS distributions of^(63)Cu and^(86)Sr isotopes(leading to^(85m)Sr isotope production)were successfully extracted.These extracted PNCS distributions were benchmarked against available PNCS data or TALYS calculations,demonstrating the validity of the proposed extraction method.Potential applications for predicting the PNCS distributions of the 30 iso-topes are further introduced.We conclude that the proposed extraction method is an effective complement to the available sophisticated methods for measuring and evaluating PNCS data.
基金Project supported by the National Natural Science Foundation of China(Grant No.11655003)
文摘High energy γ-ray can be used for nuclear waste transmutation by using the giant dipole resonance(GDR). The photonuclear reaction 197Au(γ, n) is known as a standard for studies on photoactivation experiments. The previous experiments on 197Au(γ, n) have been performed with bremsstrahlung, positron annihilation in flight or laser Compton scattering γ-ray.In this work, a new mono-energetic γ-ray source based on 13C(p,γ)^14N reaction is used to measure the cross section of 197Au(γ, n) and the measured value is compared with the results obtained with other ways.
基金The project supported in part by the International Atomic Energy Agency and the National Natural Science Foundation of China
文摘The semiempirical peak energy formulas of the giant dipole resonance doubele peaksfor large deformation regions are reasonably derived in terms of the single peak giant dipoleresonance formula presented by Zeng Jinyan and Yang Fujia and the nuclear deformationparameter.The peak energies available in the nuclear mass region 50【A【250 can be wellreproduced by using these formulas.
基金supported by the Sinop University Scientific Research Projects Coordination Unit.Project Number:FEF-1901-14-04,2014
文摘The neutrons have been captured by Erbium nuclei which were received by using clinical electron linear accelerator. In this experiment, the possibility of the neutron capture process has been observed because of emitted neutrons appearing in the experimental area. In particular,neutron capture of ^(170)Er nucleus has been observed. After the neutron capture of ^(170)Er nucleus, the unstable ^(171)Er has been formed and decayed into the ^(171)Tm. By using this reaction path, some transition energies of ^(171)Tm obtained from the residual activity measurements and the half-life of ^(171)Er have been determined, and they are in agreement with adopted values in the literature.
基金The project supported in part by the International Atomic Energy Agency the National Natural Science Foundation of China
文摘The giant dipole resonance parameters of the nuclides <sup>12</sup>C, <sup>14</sup>N, <sup>16</sup>O, <sup>27</sup>Al and <sup>28</sup>Si areextracted by fitting the Lorentz curves to the experimental data of the photonuclear reactioncross sections and are used to calculate the integrated cross sections, the first moments and thesecond moments of the integrated cross sections of the photonuclear reaction giant dipole reso-nances of these nuclides. Better coincidence of the calculated results with the experimental isreached, confirming the reliability of these parameters.
基金Partially supported by the National Natural Science Foundation of China(11890714,11421505,11905284,11961141003)the Strategic Priority Research Program of the CAS(XDB34030200,XDB16)and the Key Research Program of Frontier Sciences of the CAS(QYZDJ-SSW-SLH002)。
文摘Neutron-proton momentum correlation functions are constructed from a three-body photodisintegration channel,i.e.,core+n+p,and used to explore the spatial-time information of the non-clustering Woods-Saxon spherical structure as well as theα-clustering structures of^12C or^16O based on an extended quantum molecular dynamics model.The emission time sequence of neutrons and protons is indicated by the ratio of velocity-gated neutron-proton correlation functions,demonstrating its sensitivity toα-clustering structures.This work sheds light on a new probe forα-clustering structures.
文摘计算了电子加速器中不同能量的电子垂直入射到钨靶和金靶上时的光中子产额。采用 Monte Carlo 程序EGS4对电子光子簇在靶中的输运进行模拟 ,计算出光子在靶中的径迹长度 ,从而求出光中子产额。对电子加速器钨靶和金靶中的光中子产额进行了计算 ,得到了电子加速器中光中子产额随打靶电子能量变化的规律及随靶厚度变化的规律 ,为加速器靶和屏蔽系统的设计提供依据 。
