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1The antiproton annihilation detector system of the ATRAP experiment显示文摘The ATRAP (antihydrogen trap collaboration) at CERN (European organization for nuclear research) has developed a completely new, larger and more robust apparatus in the second experimental zone. The antiproton annihilation detector system consists of 10 layers of scintillating fibers, counts the antihydrogen atoms and determines the annihilation vertex of the atoms. This diagnostic element will allow to optimize the production of cold antihydrogen sufficiently to permit the optical observations and measurements. Using this new apparatus thousands of antihydrogen atoms have been produced within a combined Penning-Ioffe trap. These observed antihydrogen atoms resolve a debate about whether positrons and antiprotons can be brought together to form antihydrogen atoms within the divergent magnetic fields of a quadrupole Ioffe trap.OELERT Walter GRZONKA Dieter SEFZICK Thomas 2009Chinese Science Bulletin2009,54,2:2
2Measurement of solid state nuclear tracks in apatite by thermal analysis method显示文摘A new measurement method of thermal analysis for solid state nuclear tracks is proposed.The annealing heat emitted by the unit mass of solid state nuclear tracks in heavy particles of the sample is determined via micro-thermal analysis method.Hence,the number of solid state nuclear tracks in the unit mass of sample is determined.In particular,this paper introduces the method and its significance to measure the number of α-particles nuclear tracks in apatite by measuring the annealing heat of α-particles nuclear tracks.In addition,the mechanism of the measurement and potential applications are discussed.HE ShaoRong YANG TongSuo LI TianXiang LU BaiZuo JI ShuLi HENG ShuYun 2009Chinese Science Bulletin2009,54,20:1
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