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首页> 外文期刊>Physics of atomic nuclei >Measurement of the Mean Free Path of Relativistic C-12 Nuclei Undergoing Coherent Fragmentation to Three Alpha Particles in a Nuclear Emulsion Filled with Lead Nuclei
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Measurement of the Mean Free Path of Relativistic C-12 Nuclei Undergoing Coherent Fragmentation to Three Alpha Particles in a Nuclear Emulsion Filled with Lead Nuclei

机译：在核乳液中填充铅核的三种α颗粒经历相干碎裂到三种α颗粒的平均自由路径的测量

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A stack of track-photoemulsion layers was exposed to a beam of C-12 ions accelerated to a momentum of 4.5 GeV/c per nucleon at the synchrophasotron of the Laboratory of High Energies at the Joint Institute for Nuclear Research (JINR, Dubna). The mean free path of relativistic C-12 nuclei was measured for the reaction of their coherent fragmentation to three alpha particles in BR-2 nuclear track photoemulsion filled with lead nuclei in proportion of one lead atom per five silver atoms. The result was ((Em+Pb)) = (11 +/- 3) m. The cross section of sigma((Em+Pb)) = (18 +/- 3) mb averaged over all track-photoemulsion nuclei corresponds to this value of ((Em+Pb)). From a comparison of the value obtained in the present study for ((Em+Pb)) with the mean free path of C-12 nuclei in a standard BR-2 track photoemulsion, (10.3 +/- 1.5) m, it follows that, in this channel, a nuclear fragmentation mechanism is dominant in the fragmentation of C-12 nuclei both off lead nuclei and off track-photoemulsion nuclei.
机译：将一堆轨道 - 光脉冲层暴露于C-12离子的光束，其在核研究学院（Jinr，Dubna）的高能量实验室的高能量实验室的同步调节中加速至4.5 gev / c的动量。测量相干性C-12核的平均自由路径用于将它们的相干碎片化与每五个银原子的一个引线原子的铅核的铅核的三种α颗粒反应。结果是（（EM + Pb））=（11 +/- 3）m。在所有轨道 - 漂亮乳液核上平均σ（（EM + PB））=（18 +/- 3）MB的横截面对应于该值（（EM + PB））。从本研究中获得的（（EM + Pb）中获得的值的比较，在标准BR-2轨道光脉冲中的C-12核的平均自由路径（10.3 +/- 1.5）m，它遵循在该通道中，核碎裂机制在C-12核外偏离核和偏离轨道 - 光激髓核的碎裂中占主导地位。

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