Formation of the Multineutron Systems \({}^{{2}}{n}\) and \({}^{{3}}{n}\) in the Reactions of Stopped Pion Absorption

IF 0.3 4区 物理与天体物理 Q4 PHYSICS, NUCLEAR
Yu. B. Gurov, B. A. Chernyshev, S. A. Evseev, S. V. Rozov, V. G. Sandukovsky, M. V. Tel’kushev
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引用次数: 0

Abstract

The formation of the multineutron systems \({}^{2}n\) and \({}^{3}n\) was studied in the reactions of stopped pion absorption by \({}^{9}\)Be nuclei. Measurements were carried out at low energy pion channel of LANL using two-arm multilayer semiconductor spectrometer. The bound states of \({}^{2}n\) and \({}^{3}n\) have not been found. In the missing mass spectrum of the reaction \({}^{9}\)Be(\(\pi^{-}\), \(t^{4}\)He), a peak was observed near the threshold, which is due to the formation of the \(s\)-wave virtual state of the dineutron. Indications of the existence of two states of the \({}^{3}n\) with resonant energies (\(E_{r}\approx 6\) MeV, and \({\approx}14\) MeV) were first obtained in the reactions \({}^{9}\)Be(\(\pi^{-}\), \(d^{4}\)He) and \({}^{9}\)Be(\(\pi^{-}\), \(t^{3}\)He). Comparison with theoretical and experimental results obtained by other authors was performed.

停止介子吸收反应中多中子体系\({}^{{2}}{n}\)和\({}^{{3}}{n}\)的形成
多中子系统的形成 \({}^{2}n\) 和 \({}^{3}n\) 对介子停止吸收反应进行了研究 \({}^{9}\)成为核心。利用双臂多层半导体光谱仪对LANL的低能介子通道进行了测量。的束缚态 \({}^{2}n\) 和 \({}^{3}n\) 还没有找到。在缺失的反应质谱中 \({}^{9}\)他(\(\pi^{-}\), \(t^{4}\)He),在阈值附近观察到一个峰,这是由于形成的 \(s\)中子的波虚态。两种状态存在的迹象 \({}^{3}n\) 具有共振能量(\(E_{r}\approx 6\) MeV,和 \({\approx}14\) MeV)在反应中首次得到 \({}^{9}\)他(\(\pi^{-}\), \(d^{4}\)他)和 \({}^{9}\)他(\(\pi^{-}\), \(t^{3}\)他)。并与其他作者的理论和实验结果进行了比较。
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来源期刊
Physics of Atomic Nuclei
Physics of Atomic Nuclei 物理-物理:核物理
CiteScore
0.60
自引率
25.00%
发文量
56
审稿时长
3-6 weeks
期刊介绍: Physics of Atomic Nuclei is a journal that covers experimental and theoretical studies of nuclear physics: nuclear structure, spectra, and properties; radiation, fission, and nuclear reactions induced by photons, leptons, hadrons, and nuclei; fundamental interactions and symmetries; hadrons (with light, strange, charm, and bottom quarks); particle collisions at high and superhigh energies; gauge and unified quantum field theories, quark models, supersymmetry and supergravity, astrophysics and cosmology.
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