A new decay detection system with high detection efficiency and low detection threshold has been developed for charged-particle decay studies, including β-delayed proton, α decay or direct proton emission from proto...A new decay detection system with high detection efficiency and low detection threshold has been developed for charged-particle decay studies, including β-delayed proton, α decay or direct proton emission from proton-rich nuclei. The detection system was tested by using the β-delayed proton emitter ^(24)Si and was commissioned in the decay study of ^(22)Si produced by projectile fragmentation at the First Radioactive Ion Beam Line in Lanzhou. Under a continuous-beam mode, the isotopes of interest were implanted into two double-sided silicon strip detectors, where the subsequent decays were measured and correlated to the preceding implantations by using position and time information. The system allows to measure protons with energies down to about 200 ke V without obvious β background in the proton spectrum. Further application of the detection system can be extended to the measurements of β-delayed proton decay and the direct proton emission of other exotic proton-rich nuclei.展开更多
在相对论重离子碰撞中,整体喷注作为研究解禁闭的夸克胶子等离子体的重要探针近年来已被广泛研究。本工作基于多相输运模型(A Multi-Phase Transport model,AMPT),研究了在质心系能量为2.76 TeV的铅核-铅核碰撞中的双喷注不对称、喷注...在相对论重离子碰撞中,整体喷注作为研究解禁闭的夸克胶子等离子体的重要探针近年来已被广泛研究。本工作基于多相输运模型(A Multi-Phase Transport model,AMPT),研究了在质心系能量为2.76 TeV的铅核-铅核碰撞中的双喷注不对称、喷注的碎裂函数和喷注形状三方面的内容。数值模拟结果表明,在喷注与部分子物质的强相互作用中,喷注会有明显的能量损失。末态双喷注不对称是由初态不对称度和部分子喷注能损的共同作用导致的;喷注的碎裂函数可以分解为碎裂强子化和组合强子化两部分;相比于领头喷注,由于次领头喷注能量损失更大,所以导致次领头喷注的形状改变更大一些。展开更多
基金National Basic Research Program of China(2013CB834404)National Natural Science Foundation of China(11375268,11475263,U1432246,U1432127)
文摘A new decay detection system with high detection efficiency and low detection threshold has been developed for charged-particle decay studies, including β-delayed proton, α decay or direct proton emission from proton-rich nuclei. The detection system was tested by using the β-delayed proton emitter ^(24)Si and was commissioned in the decay study of ^(22)Si produced by projectile fragmentation at the First Radioactive Ion Beam Line in Lanzhou. Under a continuous-beam mode, the isotopes of interest were implanted into two double-sided silicon strip detectors, where the subsequent decays were measured and correlated to the preceding implantations by using position and time information. The system allows to measure protons with energies down to about 200 ke V without obvious β background in the proton spectrum. Further application of the detection system can be extended to the measurements of β-delayed proton decay and the direct proton emission of other exotic proton-rich nuclei.
基金National Basic Research Program of China(973 Program)(2013CB834404)National Natural Science Foundation of China(11375268,11475263,U1432246,U1432127,11505293,11635015)~~
文摘在相对论重离子碰撞中,整体喷注作为研究解禁闭的夸克胶子等离子体的重要探针近年来已被广泛研究。本工作基于多相输运模型(A Multi-Phase Transport model,AMPT),研究了在质心系能量为2.76 TeV的铅核-铅核碰撞中的双喷注不对称、喷注的碎裂函数和喷注形状三方面的内容。数值模拟结果表明,在喷注与部分子物质的强相互作用中,喷注会有明显的能量损失。末态双喷注不对称是由初态不对称度和部分子喷注能损的共同作用导致的;喷注的碎裂函数可以分解为碎裂强子化和组合强子化两部分;相比于领头喷注,由于次领头喷注能量损失更大,所以导致次领头喷注的形状改变更大一些。
