PRECISE MEASUREMENTS OF SECONDARY ELECTRONS AND IONS PRODUCED IN COLLISIONS BETWEEN FAST PROJECTILE IONS AND LIQUID MOLECULAR JET TARGETS

该项目是世界上第一个利用液体分子束(LMB)技术研究物质在液体中的辐射效应的项目。在研究的第一阶段，各种技术障碍，包括LMB本身和相关的符合测量技术，都是需要排除的课题。在2007年的现阶段，这些困难大部分已经解决，各种新的激励性实验已经系统地开始了，如高能重离子的阻止能力和各种喷注的二次电子和离子的测量。在研究期间获得的被认为在辐射物理和辐射癌症治疗中非常重要的2 MeV质子束能量损失的初步实验数据，在国际会议、国内研讨会和研讨会上以及在国际期刊上被报道。我们还进行了其他相关的实验，如九种氨基酸分子的电子发射光谱和快重离子与富勒烯C_(60)的各种非弹性碰撞，其中详细地研究了高能量沉积后的多重电离和由弛豫引起的多重发散。利用多重散射理论和蒙特卡罗模拟，从实验和理论两个方面考察了水和乙醇对2 MeV质子的阻挡能力。事实证明，目前的值与全球使用的SRIM代码估计的值相差10%。据我们所知，我们是第一个警告不要在辐射物理中不加批判地使用这个代码的人。

THE PROJECT IS THE FIRST WORLDWIDE TO STUDY RADIATION EFFECTS ON MATTER-IN-LIQUID PHASE PREPARED BY MEANS OF A LIQUID MOLECULAR BEAM (LMB) TECHNIQUE. AT THE FIRST STAGE OF THE RESEARCH PERIOD, VARIOUS TECHNICAL OBSTACLES INCLUDING LMB ITSELF AND RELEVANT COINCIDENCE MEASUREMENT TECHNIQUES HAVE BEEN THE SUBJECTS TO BE REMOVED. AT THE PRESENT STAGE OF 2007, MOST OF THESE DIFFICULTIES HAVE BEEN SOLVED AND VARIOUS NEW EXCITING EXPERIMENTS HAVE BEEN STARTED SYSTEMATICALLY SUCH AS STOPPING POWER OF ENERGETIC HEAVY IONS AND MEASUREMENTS OF SECONDARY ELECTRONS AND IONS FROM VARIOUS JET TARGETS.PRELIMINARY EXPERIMENTAL DATA OBTAINED DURING THE RESEARCH PERIOD CONCERNING ENERGY LOSS OF A 2MEV PROTON BEAM, WHICH ARE REGARDED AS EXTREMELY IMPORTANT IN RADIATION PHYSICS AND RADIATION CANCER THERAPY, WERE REPORTED IN INTERNATIONAL CONFERENCES, IN DOMESTIC SEMINARS AND SYMPOSIUMS AND IN INTERNATIONAL JOURNALS. ALSO WE CARRIED OUT OTHER CLOSELY RELATED EXPERIMENTS LIKE ELECTRON EMISSION SPECTRA FROM NINE KINDS OF AMINO ACIDS MOLECULES AND VARIOUS INELASTIC COLLISIONS BETWEEN FAST HEAVY IONS AND FULLERERENE C60 FOR WHICH MULTIPLE-IONIZATION AND MULTIFRAGMENTATION RESULTING FROM RELAXATION AFTER DEPOSITION OF HIGH AMOUNT OF INTERNAL ENERGIES HAVE BEEN INVESTIGATED IN DETAIL. ALL THESE RELEVANT EXPERIMENTAL RESULTS HAVE ALSO BEEN PUBLISHED IN INTERNATIONAL JOURNALS AS LISTED BELOW.THE STOPPING POWER OF WATER AND ETHANOL ON 2 MEV PROTONS WERE EXAMINED BOTH EXPERIMENTALLY AND THEORETICALLY USING MULTIPLE-SCATTERING THEORY AND MONTE-CARLO SIMULATIONS. IT TURNED OUT THAT THE PRESENT VALUES ARE DIFFERENT BY 10 % FROM THOSE ESTIMATED FROM THE WORLDWIDE-USED SRIM CODE. TO OUR BEST KNOWLEDGE WE ARE THE FIRST TO WARN AGAINST UNCRITICAL USE OF THIS CODE IN RADIATION PHYSICS.