Collinear laser spectroscopy is a powerful tool for studying the nuclear spins,electromagnetic moments,and charge radii of exotic nuclei.To study the nuclear properties of unstable nuclei at the Beijing Radioactive Io...Collinear laser spectroscopy is a powerful tool for studying the nuclear spins,electromagnetic moments,and charge radii of exotic nuclei.To study the nuclear properties of unstable nuclei at the Beijing Radioactive Ion-beam Facility(BRIF)and the future High Intensity Heavy-ion Accelerator Facility(HIAF),we developed a collinear laser spectroscopy apparatus integrated with an offline laser ablation ion source and a laser system.The overall performance of this state-of-the-art technique was evaluated,and the system was commissioned using a bunched stable ion beam.The high-resolution optical spectra for the 4s ^(2)S_(1/2)→4p^(2)P_(3/2)(D2)ionic transition of ^(40;42;44;48)Ca isotopes were successfully measured.The extracted isotope shifts relative to ^(40)Ca showed excellent agreement with the literature values.This system is now ready for use at radioactive ion beam facilities such as the BRIF and paves the way for the further development of higher-sensitivity collinear resonance ionization spectroscopy techniques.展开更多
Purpose Glass is a potential choice for the scintillator in Hadronic calorimetry(HCAL)of the CEPC.It requires sophisticated instruments and suitable methods to obtain scintillation properties of the glasses in the fir...Purpose Glass is a potential choice for the scintillator in Hadronic calorimetry(HCAL)of the CEPC.It requires sophisticated instruments and suitable methods to obtain scintillation properties of the glasses in the first time.It is necessary to establish an evaluation method for nuclear radiation detection performance of glass scintillator.Methods The spectroscopy research of the glass includes transmission/absorption spectrum and emission spectrum.The time characteristics include rise time,scintillation decay time and afterglow.The scintillation properties include light yield,energy resolution and minimum ionizing particle(MIP)response.And a new method for measuring the low light yield of glass scintillators is proposed.Results We have built a complete performance test system and evaluation method,which can evaluate the nuclear radiation detection performance of different glass scintillators.Conclusion By continuously improving the composition and preparation process of the glass,it can provide potential possibilities for the application in the high-energy physics experiment and nuclear radiation detection fields.展开更多
基金supported by the National Natural Science Foundation of China(Nos.12027809,U1967201,11875073,11875074 and 11961141003)National Key R&D Program of China(No.2018YFA0404403)+1 种基金China National Nuclear Corporation(No.FA18000201)the State Key Laboratory of Nuclear Physics and Technology,Peking University(No.NPT2019ZZ02).
文摘Collinear laser spectroscopy is a powerful tool for studying the nuclear spins,electromagnetic moments,and charge radii of exotic nuclei.To study the nuclear properties of unstable nuclei at the Beijing Radioactive Ion-beam Facility(BRIF)and the future High Intensity Heavy-ion Accelerator Facility(HIAF),we developed a collinear laser spectroscopy apparatus integrated with an offline laser ablation ion source and a laser system.The overall performance of this state-of-the-art technique was evaluated,and the system was commissioned using a bunched stable ion beam.The high-resolution optical spectra for the 4s ^(2)S_(1/2)→4p^(2)P_(3/2)(D2)ionic transition of ^(40;42;44;48)Ca isotopes were successfully measured.The extracted isotope shifts relative to ^(40)Ca showed excellent agreement with the literature values.This system is now ready for use at radioactive ion beam facilities such as the BRIF and paves the way for the further development of higher-sensitivity collinear resonance ionization spectroscopy techniques.
基金supported by National Natural Science Foundation of China(No.12175253,12335012)the Program of Science Technology Service Network of Chinese Academy of Science,Youth Innovation Promotion Association CAS.
文摘Purpose Glass is a potential choice for the scintillator in Hadronic calorimetry(HCAL)of the CEPC.It requires sophisticated instruments and suitable methods to obtain scintillation properties of the glasses in the first time.It is necessary to establish an evaluation method for nuclear radiation detection performance of glass scintillator.Methods The spectroscopy research of the glass includes transmission/absorption spectrum and emission spectrum.The time characteristics include rise time,scintillation decay time and afterglow.The scintillation properties include light yield,energy resolution and minimum ionizing particle(MIP)response.And a new method for measuring the low light yield of glass scintillators is proposed.Results We have built a complete performance test system and evaluation method,which can evaluate the nuclear radiation detection performance of different glass scintillators.Conclusion By continuously improving the composition and preparation process of the glass,it can provide potential possibilities for the application in the high-energy physics experiment and nuclear radiation detection fields.
