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当代原子核物理的前沿是极端条件下原子核的研究.重离子核物理正沿着能量(激发能、核温度)、同位旋和自旋3个维度及非核自由度不断取得新的进展.与重离子物理的发展相适应,重离子加速器技术正在向更高能量、多种类放射性束和高品质(低能散和低发射度)束流3个方向发展.兰州重离子加速器(HIRFL)是加速低、中能重离子束流的回旋加速器系统(见图1).近年来在HIRFL上进行了炮弹碎裂(PF)型放射性束流线RIBLL和电子回旋共振(ECR)离子源的研制.这是HIRFL最重要的发展升级.利用HIRFL系统和其他实验装置,中国科学院近代物理研究所(IMP)在重离子物理关于热核和远离稳定线原子核前沿领域的实验研究中取得了重要进展.本文以PF型RIBLL和ECR离子源研制为重点,介绍HIRFL的最新发展;综述 HIR-FL上的中能重离子碰撞热核性质研究,包括轻粒子发射时标和发射源时空演化、三和四重碎片发射、复杂碎片发射机制、靶余核质量产额分布和相关衰变机制、热核限制性温度和不稳定核在平面和出平面发射等;本文还讨论近代物理研究所在HIRFL和高压倍加器强中子源及其他实验装置上远离稳定线新核素的合成,及远离核衰变性质和核结构研究的重要进
The frontier of contemporary nuclear physics is the study of atomic nuclei in extreme conditions.Heavy ion nuclear physics is making new progress along the three dimensions of energy (excitation energy, nuclear temperature), isospin and spin, and non-nuclear degrees of freedom.With heavy ion Physics development, heavy ion accelerator technology is to higher energy, a variety of types of radioactive beam and high quality (low energy dispersion and low emission) beam development in three directions.Lanzhou heavy ion accelerator (HIRFL) is accelerating low, medium A cyclotron system capable of heavy ion beams (see Fig. 1). In recent years, the RIBLL and the electron cyclotron resonance (ECR) ion source for projectile-fracturing (PF) radioactive beam lines have been developed on HIRFLs, Important developments and upgrades.Using the HIRFL system and other experimental devices, the Chinese Academy of Sciences Institute of Modern Physics (IMP) made important progress in the field of heavy ion physics on the nuclear front and away from the nuclear frontier stabilization experiments.In this paper, PF-type RIBLL And the development of ECR ion source, and introduce the latest development of HIRFL. The research on the thermonuclear properties of heavy ion collisions on HIR-FL is reviewed, including the time-scale evolution of light-particle emission and the emission sources, Four-fragment launch, complex fragmentation launch mechanism, mass yield distribution and related decay mechanism of target residual nuclei, thermonuclear confinement temperature and unstable nuclei emission in the plane and out of the plane. In this paper, The synthesis of new nuclides far away from the stable line on the doubled neutron source and other experimental devices, and the important progress in the study far from the nature of nuclear decay and nuclear structure