The clinical trials of tumor therapy using heavy ions beam 12C are now in progress at Institute of Modern Physics in Lanzhou. In order to achieve the precise radiotherapy with the high energy 12C beam in active pencil...The clinical trials of tumor therapy using heavy ions beam 12C are now in progress at Institute of Modern Physics in Lanzhou. In order to achieve the precise radiotherapy with the high energy 12C beam in active pencil beam scanning mode, we have developed an ionization chamber(IC) as an online monitor for beam intensity and also a dosimeter after calibration. Through the choosing of working gas and voltage, optimizing of the electrics and the read-out system, calibrating the linearity, the detector system provide us one of the simple and highly reliable way to monitoring the beam during the active pencil beam scanning treatments. The measurement results of this detector system show that it could work well under the condition of high energy 12C beam in active pencil beam scanning mode.展开更多
Large area plastic scintillation detectors are applied widely in modern physics labs due to the development of the time-of-flight technique. They are usually constructed with a module array design, such as the TOF Wal...Large area plastic scintillation detectors are applied widely in modern physics labs due to the development of the time-of-flight technique. They are usually constructed with a module array design, such as the TOF Wall. The performance of such detectors is excellent, but the number of electronics channels is quite large, and the operation and calibration are too complicated. As a result, a large area plastic scintillation detector with only 4 readout signals from the corners is constructed and developed as a simple TOF Wall at ETF in IMP.展开更多
The progress of research going on in Group of Rare Isotope Beam Physics (RIB), Experimental Physics Research Center, in 2015 is in the following two aspects. Construction of the plastic scintillator detector array (PS...The progress of research going on in Group of Rare Isotope Beam Physics (RIB), Experimental Physics Research Center, in 2015 is in the following two aspects. Construction of the plastic scintillator detector array (PSD) for the DArk Matter Particle Explorer (DAMPE) project.DAMPE is part of the “Strategic Priority Research Program” of the Chinese Academy of Science for space science, and it is a large space telescope aimed for the evidence of dark matter existence through the measurements of their decay products.展开更多
Knockout reactions at intermediate and high energies have been proved to be a powerful tool for probing thesingle-particle structure of rare isotopes[1]. The spectroscopic factors and orbital angular momenta of the re...Knockout reactions at intermediate and high energies have been proved to be a powerful tool for probing thesingle-particle structure of rare isotopes[1]. The spectroscopic factors and orbital angular momenta of the removednucleons can be deduced by comparison of the experimental cross sections and longitudinal-momentum distributionsto those calculated in the Glauber reaction theory. Recently, study shows that for strongly bound valence nucleonknockout, the experimental cross sections are much smaller than reaction theory predictions[2].展开更多
The progress of research going on in Group of Rare Isotope Beam Physics (RIB), Experimental Physics ResearchCenter, in 2014 is in the following three aspects.1. Detector construction for the Dark Matter Particle Explo...The progress of research going on in Group of Rare Isotope Beam Physics (RIB), Experimental Physics ResearchCenter, in 2014 is in the following three aspects.1. Detector construction for the Dark Matter Particle Explorer (DAMPE) project. DAMPE is a large spacetelescope aimed at the evidence of dark matter existence through the measurements of their decay products. It isa part of the "Strategic Priority Research Program" of the Chinese Academy of Sciences for space science, and willbe launched in 2015. In this project, the RIB group is involved in the design and construction of the plastic scintillatorFig. 1 (color online) Accumulative adsorp-tion capacity of uranium from brine.detector array (PSD), which is a key component of theload with an active area of 0.8 m 0.8 m.展开更多
A new ΔE-E telescope has been constructed at the external target hall of CSRm[? ]. It is composed of 7 layers ofCsI(Tl) crystals. For each crystal, 4 photomultiplier tubes (PMTs) is coupled to the truncated corners f...A new ΔE-E telescope has been constructed at the external target hall of CSRm[? ]. It is composed of 7 layers ofCsI(Tl) crystals. For each crystal, 4 photomultiplier tubes (PMTs) is coupled to the truncated corners for collectingscintillation light. Each crystal has an active area of 50 mm 50 mm, and the thickness of the crystals are between5 and 10 mm. According to the requests of different experiments, the combination and the ordering of the layerscould be different. In order to achieve good uniformity of light collection, the dressing of each crystal was carefullychosen. The first three layers of the crystals are coated with ESR film, and the others are packed with 7 m Al-Foil.展开更多
基金Supported by the National Nature Science Foundation of China (No. 10305015, No.10475098)the Major Program of the Chinese Academy of Science (No. O701050YZD)
文摘The clinical trials of tumor therapy using heavy ions beam 12C are now in progress at Institute of Modern Physics in Lanzhou. In order to achieve the precise radiotherapy with the high energy 12C beam in active pencil beam scanning mode, we have developed an ionization chamber(IC) as an online monitor for beam intensity and also a dosimeter after calibration. Through the choosing of working gas and voltage, optimizing of the electrics and the read-out system, calibrating the linearity, the detector system provide us one of the simple and highly reliable way to monitoring the beam during the active pencil beam scanning treatments. The measurement results of this detector system show that it could work well under the condition of high energy 12C beam in active pencil beam scanning mode.
文摘Large area plastic scintillation detectors are applied widely in modern physics labs due to the development of the time-of-flight technique. They are usually constructed with a module array design, such as the TOF Wall. The performance of such detectors is excellent, but the number of electronics channels is quite large, and the operation and calibration are too complicated. As a result, a large area plastic scintillation detector with only 4 readout signals from the corners is constructed and developed as a simple TOF Wall at ETF in IMP.
文摘The progress of research going on in Group of Rare Isotope Beam Physics (RIB), Experimental Physics Research Center, in 2015 is in the following two aspects. Construction of the plastic scintillator detector array (PSD) for the DArk Matter Particle Explorer (DAMPE) project.DAMPE is part of the “Strategic Priority Research Program” of the Chinese Academy of Science for space science, and it is a large space telescope aimed for the evidence of dark matter existence through the measurements of their decay products.
文摘Knockout reactions at intermediate and high energies have been proved to be a powerful tool for probing thesingle-particle structure of rare isotopes[1]. The spectroscopic factors and orbital angular momenta of the removednucleons can be deduced by comparison of the experimental cross sections and longitudinal-momentum distributionsto those calculated in the Glauber reaction theory. Recently, study shows that for strongly bound valence nucleonknockout, the experimental cross sections are much smaller than reaction theory predictions[2].
文摘The progress of research going on in Group of Rare Isotope Beam Physics (RIB), Experimental Physics ResearchCenter, in 2014 is in the following three aspects.1. Detector construction for the Dark Matter Particle Explorer (DAMPE) project. DAMPE is a large spacetelescope aimed at the evidence of dark matter existence through the measurements of their decay products. It isa part of the "Strategic Priority Research Program" of the Chinese Academy of Sciences for space science, and willbe launched in 2015. In this project, the RIB group is involved in the design and construction of the plastic scintillatorFig. 1 (color online) Accumulative adsorp-tion capacity of uranium from brine.detector array (PSD), which is a key component of theload with an active area of 0.8 m 0.8 m.
文摘A new ΔE-E telescope has been constructed at the external target hall of CSRm[? ]. It is composed of 7 layers ofCsI(Tl) crystals. For each crystal, 4 photomultiplier tubes (PMTs) is coupled to the truncated corners for collectingscintillation light. Each crystal has an active area of 50 mm 50 mm, and the thickness of the crystals are between5 and 10 mm. According to the requests of different experiments, the combination and the ordering of the layerscould be different. In order to achieve good uniformity of light collection, the dressing of each crystal was carefullychosen. The first three layers of the crystals are coated with ESR film, and the others are packed with 7 m Al-Foil.
