In this study,we constructed two annular detector arrays comprising 24 wedge-shaped CsI(Tl) crystals,and tested them using anαsource and radioactive beams of ^(14-16) Con a CD_2 target.We compared the properties of a...In this study,we constructed two annular detector arrays comprising 24 wedge-shaped CsI(Tl) crystals,and tested them using anαsource and radioactive beams of ^(14-16) Con a CD_2 target.We compared the properties of a CsI(Tl) crystal encapsulated with various reflectors,revealing that using the 80-μm-thick ESR film to pack the CsI(Tl) crystal yielded the largest light output with the smallest non-uniformity in light output (ΔLO).For the 24 CsI(Tl) detectors with the 80-μm-thick ESR films,the average energy resolution improved as the average light output increased;however,it deteriorated as theΔLO value increased.To form two annular Si-CsI(Tl) telescopes for identifying the light-charged particles,theΔLO value and energy resolution of each CsI(Tl) detector were maintained under 20%and 7.7%,respectively.These telescopes were tested for the first time in a direct nuclear reaction experiment using ^(14-16) C+d.The results demonstrated that the Z=1 and Z=2 charged particles were adequately discriminated by the telescopes using the standardΔE-E method.展开更多
A fully digital data acquisition system based on a field-programmable gate array(FPGA) was developed for a CsI(Tl) array at the external target facility(ETF) in the Heavy Ion Research Facility in Lanzhou(HIRFL). To pr...A fully digital data acquisition system based on a field-programmable gate array(FPGA) was developed for a CsI(Tl) array at the external target facility(ETF) in the Heavy Ion Research Facility in Lanzhou(HIRFL). To process the CsI(Tl) signals generated by γ-rays and light-charged ions, a scheme for digital pulse processing algorithms is proposed. Every step in the algorithms was benchmarked using standard γ and α sources. The scheme, which included a moving average filter, baseline restoration, leading-edge discrimination, moving window deconvolution, and digital charge comparison, was subsequently implemented on the FPGA. A good energy resolution of 5.7% for 1.33-MeV γ-rays and excellent α-γ identification using the digital charge comparison method were achieved, which satisfies CsI(Tl) array performance requirements.展开更多
The performance test of a CsI(Tl) crystal (70×27×23 mm3) was performed by applying the pulse shape discrimination technique for identification of light charged particles .The crystal is coupled to a photomul...The performance test of a CsI(Tl) crystal (70×27×23 mm3) was performed by applying the pulse shape discrimination technique for identification of light charged particles .The crystal is coupled to a photomultiplier tube during an experiment with 6He beam.The pulse waveform is fully recorded by employing a high precision digital oscilloscope.The fast and slow gates are used for the pulse shape discrimination and the best values for the gate widths were determined to be 0.5 μs and 1.67 μs,respectively.The 6He,4He and 3He are successfully discriminated with this technique.展开更多
Three pulse-shape-discrimination (PSD) methods are applied to study the particle identification (PID) by using CsI(Tl) crystal, especially for identifying light charged particles. The zero-cross time method, fast and ...Three pulse-shape-discrimination (PSD) methods are applied to study the particle identification (PID) by using CsI(Tl) crystal, especially for identifying light charged particles. The zero-cross time method, fast and total component method and signal rise time method are used. The experiment, data analysis and results are compared. Good PID for p, α and γ can be achieved with a CsI(Tl)-photomultiplier assembly.展开更多
Depend on the good performance, the CsI crystal developed by the Crystal Detector Group has a good reputation in the international market. So far, In addition to meeting the needs of the external target experimental t...Depend on the good performance, the CsI crystal developed by the Crystal Detector Group has a good reputation in the international market. So far, In addition to meeting the needs of the external target experimental terminal in the CSR, pieces of CsI(Tl) crystals have been sold to some international and domestic research institutes, colleges and universities. They have been used for kinds of experiments in some well-known labs in German, America and Japan, and so on.展开更多
The thallium-doped ces sium iodide(CsI(Tl))scintilla-tor is widely used in the fields of nuclear physics,nuclear medicine,safety inspection,for the characteristics of high density,high luminous efficiency,high radiati...The thallium-doped ces sium iodide(CsI(Tl))scintilla-tor is widely used in the fields of nuclear physics,nuclear medicine,safety inspection,for the characteristics of high density,high luminous efficiency,high radiation-hardness,low cost,etc[1-3].展开更多
CsI(Tl)is a kind of the colorless transparent cubic crystal with the advantages of high average atomic number,high density,no cleavage plane,easy processing,radiation resistance,good optical performance,etc.It has hig...CsI(Tl)is a kind of the colorless transparent cubic crystal with the advantages of high average atomic number,high density,no cleavage plane,easy processing,radiation resistance,good optical performance,etc.It has high efficiency used as the x/-rays detector[1].Coupled with silicon photodiode,it is one of the largest scintillation light output in all known scintillation materials with small size,low electric,magnetic field interference,and so on.CsI(Tl)detector can be used for discrimination of ray pulse shape.CsI(Tl)is widely used as excellent performance in high-energy nuclear physics[2;3],nuclear medicine(such as XCT,PET),geophysics,radiation chemistry,security check,and many other fields.展开更多
基金supported by the National Natural Science Foundation of China (Nos.12275007, U1867214, 11775004)the funding from the State Key Laboratory of Nuclear Physics and Technology,Peking University,China (No. NPT2021ZZ01)funding from heavy Ion Research Facility,Lanzhou,China (No. HIR2021PY002)。
文摘In this study,we constructed two annular detector arrays comprising 24 wedge-shaped CsI(Tl) crystals,and tested them using anαsource and radioactive beams of ^(14-16) Con a CD_2 target.We compared the properties of a CsI(Tl) crystal encapsulated with various reflectors,revealing that using the 80-μm-thick ESR film to pack the CsI(Tl) crystal yielded the largest light output with the smallest non-uniformity in light output (ΔLO).For the 24 CsI(Tl) detectors with the 80-μm-thick ESR films,the average energy resolution improved as the average light output increased;however,it deteriorated as theΔLO value increased.To form two annular Si-CsI(Tl) telescopes for identifying the light-charged particles,theΔLO value and energy resolution of each CsI(Tl) detector were maintained under 20%and 7.7%,respectively.These telescopes were tested for the first time in a direct nuclear reaction experiment using ^(14-16) C+d.The results demonstrated that the Z=1 and Z=2 charged particles were adequately discriminated by the telescopes using the standardΔE-E method.
基金supported by the Open Research Project of CAS Large Research InfrastructuresCAS Key Technology Talent ProgramNational Natural Science Foundations of China (Nos.U2031206 and 12273086)
文摘A fully digital data acquisition system based on a field-programmable gate array(FPGA) was developed for a CsI(Tl) array at the external target facility(ETF) in the Heavy Ion Research Facility in Lanzhou(HIRFL). To process the CsI(Tl) signals generated by γ-rays and light-charged ions, a scheme for digital pulse processing algorithms is proposed. Every step in the algorithms was benchmarked using standard γ and α sources. The scheme, which included a moving average filter, baseline restoration, leading-edge discrimination, moving window deconvolution, and digital charge comparison, was subsequently implemented on the FPGA. A good energy resolution of 5.7% for 1.33-MeV γ-rays and excellent α-γ identification using the digital charge comparison method were achieved, which satisfies CsI(Tl) array performance requirements.
基金Supported by National Basic Research Program (973 Program) of China (2007CB815002)NSFC (10775003,10827505)
文摘The performance test of a CsI(Tl) crystal (70×27×23 mm3) was performed by applying the pulse shape discrimination technique for identification of light charged particles .The crystal is coupled to a photomultiplier tube during an experiment with 6He beam.The pulse waveform is fully recorded by employing a high precision digital oscilloscope.The fast and slow gates are used for the pulse shape discrimination and the best values for the gate widths were determined to be 0.5 μs and 1.67 μs,respectively.The 6He,4He and 3He are successfully discriminated with this technique.
文摘Three pulse-shape-discrimination (PSD) methods are applied to study the particle identification (PID) by using CsI(Tl) crystal, especially for identifying light charged particles. The zero-cross time method, fast and total component method and signal rise time method are used. The experiment, data analysis and results are compared. Good PID for p, α and γ can be achieved with a CsI(Tl)-photomultiplier assembly.
文摘Depend on the good performance, the CsI crystal developed by the Crystal Detector Group has a good reputation in the international market. So far, In addition to meeting the needs of the external target experimental terminal in the CSR, pieces of CsI(Tl) crystals have been sold to some international and domestic research institutes, colleges and universities. They have been used for kinds of experiments in some well-known labs in German, America and Japan, and so on.
文摘The thallium-doped ces sium iodide(CsI(Tl))scintilla-tor is widely used in the fields of nuclear physics,nuclear medicine,safety inspection,for the characteristics of high density,high luminous efficiency,high radiation-hardness,low cost,etc[1-3].
文摘CsI(Tl)is a kind of the colorless transparent cubic crystal with the advantages of high average atomic number,high density,no cleavage plane,easy processing,radiation resistance,good optical performance,etc.It has high efficiency used as the x/-rays detector[1].Coupled with silicon photodiode,it is one of the largest scintillation light output in all known scintillation materials with small size,low electric,magnetic field interference,and so on.CsI(Tl)detector can be used for discrimination of ray pulse shape.CsI(Tl)is widely used as excellent performance in high-energy nuclear physics[2;3],nuclear medicine(such as XCT,PET),geophysics,radiation chemistry,security check,and many other fields.