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来自超致密氢H(0)中激光诱导过程产生的介子。

Mesons from Laser-Induced Processes in Ultra-Dense Hydrogen H(0).

作者信息

Holmlid Leif

机构信息

Department of Chemistry and Molecular Biology, University of Gothenburg, Göteborg, Sweden.

出版信息

PLoS One. 2017 Jan 12;12(1):e0169895. doi: 10.1371/journal.pone.0169895. eCollection 2017.

DOI:10.1371/journal.pone.0169895
PMID:28081199
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5231349/
Abstract

Large signals of charged light mesons are observed in the laser-induced particle flux from ultra-dense hydrogen H(0) layers. The mesons are formed in such layers on metal surfaces using < 200 mJ laser pulse-energy. The time variation of the signal to metal foil collectors and the magnetic deflection to a movable pin collector are now studied. Relativistic charged particles with velocity up to 500 MeV u-1 thus 0.75 c are observed. Characteristic decay time constants for meson decay are observed, for charged and neutral kaons and also for charged pions. Magnetic deflections agree with charged pions and kaons. Theoretical predictions of the decay chains from kaons to muons in the particle beam agree with the results. Muons are detected separately by standard scintillation detectors in laser-induced processes in ultra-dense hydrogen H(0) as published previously. The muons formed do not decay appreciably within the flight distances used here. Most of the laser-ejected particle flux with MeV energy is not deflected by the magnetic fields and is thus neutral, either being neutral kaons or the ultra-dense HN(0) precursor clusters. Photons give only a minor part of the detected signals. PACS: 67.63.Gh, 14.40.-n, 79.20.Ds, 52.57.-z.

摘要

在来自超致密氢H(0)层的激光诱导粒子流中观测到带电轻介子的大信号。利用小于200 mJ的激光脉冲能量在金属表面的此类层中形成介子。现在研究了信号对金属箔收集器的时间变化以及对可移动针状收集器的磁偏转。观测到速度高达500 MeV u-1（即0.75 c）的相对论性带电粒子。观测到了介子衰变的特征衰变时间常数，包括带电和中性的K介子以及带电的π介子。磁偏转与带电π介子和K介子相符。粒子束中从K介子到μ子的衰变链的理论预测与结果相符。如先前发表的那样，在超致密氢H(0)的激光诱导过程中，μ子由标准闪烁探测器单独检测到。形成的μ子在此处使用的飞行距离内不会明显衰变。大多数具有MeV能量的激光喷射粒子流不会被磁场偏转，因此是中性的，要么是中性K介子，要么是超致密HN(0)前体簇。光子在检测到的信号中只占一小部分。物理分类号：67.63.Gh，14.40.-n，79.20.Ds，52.57.-z。

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