在ELSA上首次测量了质子在0.7至1.8 GeV能量范围内的格拉西莫夫-德雷尔-赫恩求和规则。
First Measurement of the Gerasimov-Drell-Hearn Sum Rule for 1H from 0.7 to 1.8 GeV at ELSA.
作者信息
Dutz H, Helbing K, Krimmer J, Speckner T, Zeitler G, Ahrens J, Altieri S, Annand J R M, Anton G, Arends H-J, Beck R, Bock A, Bradtke C, Braghieri A, v Drachenfels W, Frommberger F, Godo M, Goertz S, Grabmayr P, Hasegawa S, Hansen K, Harmsen J, Heid E, Hillert W, Holvoet H, Horikawa N, Iwata T, Van Hoorebeke L, d'Hose N, Jennewein P, Kiel B, Klein F, Kondratiev R, Lang M, Lannoy B, Leukel R, Lisin V, Menze D, Meyer W, Michel T, Naumann J, Panzeri A, Pedroni P, Pinelli T, Preobrajenski I, Radtke E, Reicherz G, Rohlof C, Rostomyan T, Sauer M, Schoch B, Schumacher M, Tamas G, Thomas A, van de Vyver R, Weihofen W, Zapadtka F
机构信息
Physikalisches Institut, Universität Bonn, D-53115 Bonn, Germany.
出版信息
Phys Rev Lett. 2003 Nov 7;91(19):192001. doi: 10.1103/PhysRevLett.91.192001. Epub 2003 Nov 4.
To verify the fundamental Gerasimov-Drell-Hearn (GDH) sum rule for the first time experimentally, we measured the helicity dependent total photoabsorption cross section with circularly polarized real photons and longitudinally polarized nucleons in the photon energy range 0.68-1.82 GeV with the tagged photon facility at ELSA. The experiment was carried out with a 4pi detection system, a circularly polarized tagged photon beam, and a frozen spin polarized proton target. The contribution to the GDH sum rule in this photon energy range is [49.9+/-2.4(stat)+/-2.2(syst)] microb.
为首次通过实验验证基本的格拉西莫夫-德雷尔-赫恩（GDH）求和规则，我们利用ELSA的标记光子装置，在0.68 - 1.82 GeV的光子能量范围内，测量了圆偏振实光子与纵向极化核子的螺旋度相关的总光吸收截面。该实验采用4π探测系统、圆偏振标记光子束和冻结自旋极化质子靶进行。在这个光子能量范围内对GDH求和规则的贡献为[49.9±2.4（统计）±2.2（系统）]微靶。
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