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

精确测量快速射弹离子与液体分子射流目标碰撞时产生的二次电子和离子

基本信息

批准号：
16360474
负责人：
ITOH Akio
金额：
$ 9.6万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

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.

该项目是世界上第一个研究辐射对通过液体分子束（LMB）技术制备的液相物质的影响的项目。在研究期的第一阶段，各种技术障碍，包括LMB本身和相关的符合测量技术，已成为待消除的主题。到2007年，这些难题已基本得到解决，各种新的激发实验也相继开始，如超导重离子的阻止本领、各种喷流靶的二次电子和二次离子的测量等。在国际会议、国内研讨会和专题讨论会以及国际期刊上都有报道。我们还进行了其他密切相关的实验，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，其中在样品中发现了大量的富勒烯沉积后的多重电离和弛豫多重碎裂。本文用多重散射理论和蒙特-卡罗模拟方法，从实验和理论两方面验证了水和乙醇对2 MeV质子的阻止本领。结果表明，目前的数值与世界范围内使用的SRIM代码估计的数值相差10%。据我们所知，我们是第一个警告不要在辐射物理学中不加批判地使用这个代码的人。