47. Study of exploratory eye movements in asperger’s syndrome

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• 作者：Chiyomi Egami ; Kiichiro Morita ; Youhei Ishii ; Yushiro Yamashit ; Toyojiro Matuishi
• 关键词：Pion ; Helium ; Gamma ; Resonance ; Neutrino
• 刊名：Clinical Neurophysiology
• 出版年：2008
• 出版时间：June 2008
• 年：2008
• 卷：119
• 期：6
• 页码：e86
• 全文大小：33 K

文摘

interactions at have been studied by means of a self-shunted streamer chamber filled with helium at atmospheric pressure. This technique allowed reconstruction of the complete kinematics of the nuclear events under analysis, since tracks of slow p, , tritium and ³He are readily measurable. The study revealed that the ⁴He nucleus behaves as a Planck radiator, emitting a Planck-like spectrum of high energy γs, when hit by a π beam of . A resonant behaviour in the π⁻n invariant mass spectrum has been observed, with and in the neutron knockout reaction: we consider this to be the first experimental evidence for the existence of the Δ⁻. The observed mass shift and width narrowing are compatible with the activation of an isobaric collective resonance in the ⁴He nucleus. The collaboration has also observed a resonant behaviour in the π⁻pp invariant mass spectrum in the pp double-charge-exchange reaction, on nuclear photoemulsion, compatible with the activation of the J^P=0⁻d^′ dibaryonic resonance with a strong p–p final state interaction. A new direct measured upper limit for the ν_μ mass has been derived by measuring a complete decay π–μ–e event recorded at the CERN PS179 experiment (Ne scattering): at a 90 % confidence level, .