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Recoil polarimetry with the Crystal Ball at MAMI

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Chinese Physics C 2009年第12期33卷 1183-1188页

作者： d.P. Watts d.I. glazier M.S. Sikora University of Edinburgh King's Buildings Edinburgh EH9 3JZ UK

The spectrum and properties of the excited states of the nucleon are still poorly established despite decades of study. These proceedings describe new measurements of pseudo-scalar meson photoproduction at the Crystal Ball at MAMI, employing a new large acceptance nucleon recoil polarimeter. The double- and single-polarisation observables obtained will provide valuable and unique data to be used as part of the world effort to improve our knowledge of this fundamental spectrum.

关键词： photoproduction reactrons

Recoil polarimetry in meson photoproduction at MAMI

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Chinese Physics C 2009年第12期33卷 1373-1376页

作者： M.H. Sikora d.I. glazier d.P. Watts University of Edinburgh King’s Buildings Edinburgh EH9 3JZ United Kingdom

The nucleon excitation spectrum remains poorly known, with the masses, widths, EM couplings and even existence of many states not well established. A program of experiments using meson photoproduction off the nucleon is being carried out to improve this situation. A new large acceptance recoil polarimeter has been developed by the Edinburgh group for use in such reactions with the Crystal Ball at MAMI. This work summarizes the procedure used to measure recoil polarization with the new device and presents some preliminary results for the double polarization observable Cx in the reaction γp→pπ, compared to the current partial wave analysis.

关键词： polarimeter meson photoproduction polarization observable recoil

Precision measurements of strangeness photoproduction at threshold energies with the Crystal Ball at MAMI-C

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Chinese Physics C 2009年第12期33卷 1358-1361页

作者： T. C. Jude d. I glazier d. P. Watts The University of Edinburgh Edinburgh EH9 3JZ UK

The photoproduction of k＋ mesons from the nucleon provides important constraints on the nucleon excitation spectrum and at threshold energies challenges effective field theories based on chiral perturbation in the strange quark sector. Preliminary cross-section measurements for γ（P, k＋）A are presented at an unprecedented beam energy resolution. The data was collected at the MAMI-C facility in Mainz using the Crystal Ball detector. A new method of k＋ detection was used in which the k＋ is tagged from its weak.d.cay products in the detector crystals. This technique has application with other calorimeters at present and future hadron facilities.

关键词： Crystal Ball detector strange meson photoproduction

简洁美观的家居化顶级影院试听室富盛音响广州Wisdom Audio演示试听室

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家庭影院技术 2010年第8期 74-75页

作者： Frankie.d

关于Wisdom Audio的音箱,相信有不少发烧友都对它很了解,甚至已经见识过它的实力。我之前则曾两次评论过Wisdom Audio Sage系列的音箱,只不过两次都是以Hi-Fi形式来测试。但事实上,Sage产品主体是针对高端消费群体而制定的家庭影院音箱... 详细信息

关于Wisdom Audio的音箱,相信有不少发烧友都对它很了解,甚至已经见识过它的实力。我之前则曾两次评论过Wisdom Audio Sage系列的音箱,只不过两次都是以Hi-Fi形式来测试。但事实上,Sage产品主体是针对高端消费群体而制定的家庭影院音箱。但由于种种的原因,一直无法听到Sage产品在家庭影院中的表现。最近,广州海印广场的富盛音响广州店新装修了一间试听室,并采用了全套Wisdom Audio的Sage系列音箱来组建家庭影院系统。而在我们参观试听室之际,Wisdom Audio的总裁Mark glazier及其同事Jon Herron正在现场做新产品发布会。也正是这个巧合,让我们更深入地了解Wisdom Audio的产品以及这个试听室的设计理念。

关键词：家庭影院音箱 Audio 家居化试听广州音响美观简洁