ΛN张量相互作用的首次观测  

First Observation of the ΛN Tensor Interaction

作　　者：周书华[1] 周静[1] 孟秋英[1] S.Ajimura H.Akikawa D.E.Alburger A.Banu R.E.Chrien G.B.Franklin J.Franz O.Hashimoto T.Hayakawa H.Hotchi K.Imai T.Kishimoto M.May D.J.Millener S.Minami Y.Miura T.Miyoshi K.Mizunuma T.Nagae S.N.Nakamura K.Nakazawa Y.Okayasu P.Pile B.P.Quinn A.Rusek Y.Sato R.Sutter H.Takahashi L.Tang H.Tamura K.Tanida M.Ukai L.Yuan 

机构地区：[1]中国原子能科学研究院 [2]Department of Physics, Osaka University,Toyonaka 5560-0043,Japan [3]Department of Physics, Kyoto University,Kyoto 606-85023,Japan [4]Brookhaven National Laboratory,Upton,New York 11973,USA [5]GSI,Darmstadt D-64291,Germany [6]Carnegie Mellon University,Pittsburgh,Pennsylvania 15213,USA [7]Department of Physics,University of Freiburg,Freiburg 79104,Germany [8]Department of Physics,Tohoku University,Sendai 980-8578,Japan [9]Institute of Particle and Nuclear Studies,KEK,Tsukuba 305-0801,Japan [10]Department of Physics,Gifu University,Gifu 501-1193,Japan [11]Department of Physics,Hampton University,Hampton,Virginia 23668,USA [12]RIKEN,Wako 351-0198,Japan

出　　处：《高能物理与核物理》2005年第7期627-631,共5页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金(1987507;10375094);U.S.DOE(DEAC0298CH10886);GrantinAidforScientificResearchfromtheMinistryofEducationofJapan(11440070;15204014)资助~~

摘　　要：在用HYPERBALL进行的16ΛO的γ射线谱学测量中,观察到由16ΛO的6.6MeV1-2激发态跃迁到基态自旋翻转二重态(1-1和0-)之间的两条γ射线.由这两条γ射线的能量差得到基态二重态之间的能量间隔为26.4±1.6(stat)±0.5(syst)keV,并由此推导出ΛN之间的张量相互作用强度T=0.03MeV.实验还测定了16ΛO的1-2激发态的激发能为6561.7±1.1(stat)±1.7(syst)keV.In a _Λ^(16)O γ-ray spectroscopy experiment with HYPERBALL,two γ-ray transitions from the 6.6MeV excited 1_2^- state to both ground-states spin-doublet members _1^- and 0^- have been observed.The measured ground-state doublet spacing is 26.4±1.6(stat)±0.5(syst)keV.Thus a small but nonzero strength of the tensor interaction between a Λ and a nucleon is deduced to be T=+0.03MeV.The excitation energy of the 1_2^- state is also determined to be 6561.7±1.1(stat)±1.7(syst)keV.

关 键 词：张量 观测 相互作用强度 Γ射线 基态自旋 激发态 能量差 激发能 谱学 跃迁 

分 类 号：O571[理学—粒子物理与原子核物理]