To overcome the difficulty and high cost of some specific isotopic targets,a substitution method was proposed to measure the cross section of the(γ,n)reactions.Considering that the natural copper element(^(nat)Cu)onl...To overcome the difficulty and high cost of some specific isotopic targets,a substitution method was proposed to measure the cross section of the(γ,n)reactions.Considering that the natural copper element(^(nat)Cu)only has^(63)Cu and^(65)Cu isotopes,the^(65)Cu(γ,n)^(64)Cu reaction was taken as an example to test the substitution method.Using quasi-monoenergeticγbeams provided by the Shanghai Laser Electron Gamma Source(SLEGS)of the Shanghai Synchrotron Radiation Facility(SSRF),^(nat)Cu(γ,n)was measured from E_(γ)=11.09 MeV to 17.87 MeV.Furthermore,based on the^(63)Cu(γ,n)reaction measured using the same experimental setup at SLEGS,^(65)Cu(γ,n)^(64)Cu was extracted using the substitution method.The abundance variation of natural copper,showing a significant influence on the cross section,was also investigated.The results were compared to the existing experimental data measured by bremsstrahlung and positron annihilation in-flight sources,and the TALYS 2.0 predictions.Theγstrength function(γSF)of^(65)Cu was obtained from the^(65)Cu(γ,n)data,and the reaction cross section of^(64)Cu(n,γ)was further calculated.展开更多
The Shanghai Laser Electron Gamma Source(SLEGS),built in the Shanghai Synchrotron Radiation Facility,is the first versatile laser Compton slant-scatterin am e in the world.The measurements of 197Au(c,1n)and 159Tb(c,1n...The Shanghai Laser Electron Gamma Source(SLEGS),built in the Shanghai Synchrotron Radiation Facility,is the first versatile laser Compton slant-scatterin am e in the world.The measurements of 197Au(c,1n)and 159Tb(c,1n)reaction cross sections were chosen as the day-one experiment at SLEGS.The SLEGS data are compared with data from the Livermore and Saclay positron annihilation in-flight facilities and with data from the NewSUBARU laser Compton backscattering facility.Our data evidence discrepancies with the results from Livermore and Saclay,while demonstrating consistency with the data from NewSUBARU.This is also consistent with new theoretical predictions.The new measurement lays the foundation for resolving the long-standing discrepancies between the Livermore and Saclay photoneutron cross section data for 19 nuclei in the future.Gamma-ray beams produced at SLEGS await a variety of experiments for nuclear physics,astrophysics and nuclear data as well as for industrial applications.展开更多
基金supported by the National key R&D program(Nos.2022YFA1602404 and 2023YFA1606901)the National Natural Science Foundation of China(Nos.12375123 and 12388102)the Natural Science Foundation of Henan Province(No.242300422048).
文摘To overcome the difficulty and high cost of some specific isotopic targets,a substitution method was proposed to measure the cross section of the(γ,n)reactions.Considering that the natural copper element(^(nat)Cu)only has^(63)Cu and^(65)Cu isotopes,the^(65)Cu(γ,n)^(64)Cu reaction was taken as an example to test the substitution method.Using quasi-monoenergeticγbeams provided by the Shanghai Laser Electron Gamma Source(SLEGS)of the Shanghai Synchrotron Radiation Facility(SSRF),^(nat)Cu(γ,n)was measured from E_(γ)=11.09 MeV to 17.87 MeV.Furthermore,based on the^(63)Cu(γ,n)reaction measured using the same experimental setup at SLEGS,^(65)Cu(γ,n)^(64)Cu was extracted using the substitution method.The abundance variation of natural copper,showing a significant influence on the cross section,was also investigated.The results were compared to the existing experimental data measured by bremsstrahlung and positron annihilation in-flight sources,and the TALYS 2.0 predictions.Theγstrength function(γSF)of^(65)Cu was obtained from the^(65)Cu(γ,n)data,and the reaction cross section of^(64)Cu(n,γ)was further calculated.
基金supported by the National key R&D program(2022YFA1602400 and 2023YFA1606901)the Science Fund for Creative Research Groups(12388102)+1 种基金the National Natural Science Foundation of China(12147101,12275338,12005280)the Key Laboratory of Nuclear Data Foundation(JCKY2022201C152).
文摘The Shanghai Laser Electron Gamma Source(SLEGS),built in the Shanghai Synchrotron Radiation Facility,is the first versatile laser Compton slant-scatterin am e in the world.The measurements of 197Au(c,1n)and 159Tb(c,1n)reaction cross sections were chosen as the day-one experiment at SLEGS.The SLEGS data are compared with data from the Livermore and Saclay positron annihilation in-flight facilities and with data from the NewSUBARU laser Compton backscattering facility.Our data evidence discrepancies with the results from Livermore and Saclay,while demonstrating consistency with the data from NewSUBARU.This is also consistent with new theoretical predictions.The new measurement lays the foundation for resolving the long-standing discrepancies between the Livermore and Saclay photoneutron cross section data for 19 nuclei in the future.Gamma-ray beams produced at SLEGS await a variety of experiments for nuclear physics,astrophysics and nuclear data as well as for industrial applications.
