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    188宝金博页面版: A partial wave analysis of the reaction Kn → πΛ in the C.M. energy region from 1900 MeV to 2100 MeV

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    内容提示： Nuclear Physics B19 (1970) 61-84. North-Holland Publishing Company A PARTIAL WAVE ANALYSIS OF THE REACTION K-n --, u-A IN THE C.M. ENERGY REGION FROM 1900 MeV TO 2100 MeV G. F. COX, G. S. ISLAM, D. C. COLLEY, D. EASTWOOD, J. R. FRY and F. R. HEATHCOTE Department of Physics, University of Birmingham D. J. CANDLIN, J. G. COLVINE, G. COPLEY, N. E. FANCEY and J. MUIR Department of Natural Philosophy, University of Edinburgh W. ANGUS, J.R. CAMPBELL, W. T. MORTON and P. J. NEGUS Department of Natural Philosophy,...

    文档格式：PDF | 页数：24 | 浏览次数：26 | 上传日期：2015-11-15 18:28:17 | 文档星级：
    Nuclear Physics B19 (1970) 61-84. North-Holland Publishing Company A PARTIAL WAVE ANALYSIS OF THE REACTION K-n --, u-A IN THE C.M. ENERGY REGION FROM 1900 MeV TO 2100 MeV G. F. COX, G. S. ISLAM, D. C. COLLEY, D. EASTWOOD, J. R. FRY and F. R. HEATHCOTE Department of Physics, University of Birmingham D. J. CANDLIN, J. G. COLVINE, G. COPLEY, N. E. FANCEY and J. MUIR Department of Natural Philosophy, University of Edinburgh W. ANGUS, J.R. CAMPBELL, W. T. MORTON and P. J. NEGUS Department of Natural Philosophy, University of Glasgow S. S. ALI, I. BUTTERWORTH, F. FUCHS, D. P. GOYAL, D. B. MILLER, D. PEARCE and B. SCHWARZSCHILD Department of Physics, Imperial College of Science and Technology, London Received 4 December 1969 Abstract: Results are presented for a ~)artial wave analysis of the reaction K-n ---' ?r-A covering a range of c.m. energies from 1900 to 2100 MeV. The events used were obtained from interactions of the type K-d ~ 7r-APs. The anal- ysis was performed both for a sample of events where Ps, the spectator proton from the deuteron, was seen, and for all events. Good agreement was found be- tween the two sets of results. Values of the resonance parameters of the E(2030) were determined, and some evidence was found supporting the existence of the F5 E(1915). In addition, the P3 amplitude was found to be rapidly changing near 2100 MeV, consistent with a resonance in this wave at 2080 MeV. 1. ~TRODUCTION Several ~-resonances have been reported to exist in the energy region 1800-2200 MeV (ref. [1]). Of these, the ~ (2030) with spin parity JP = ~+ is well established [2-6]. Positive evidence for a ~ (1915) with JP = ~+ has been found in total cross-section data [2, 4] and in an analysis of several formation experiments [5]. Other formation studies [7-10] extending up to a c.m. energy of 1900 MeV have proved insensitive to this effect. However, a recent production experiment [11] suggests a resonance, ~ (1940), with pa- rameters different from those of the ~ (1915). In particular there is a strong disagreement between the ratios of the nA and nE branching fractions for the

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