First measurement of the Gerasimov-Drell-Hearn integral for H-1 from 200 to 800 MeV - art. no. 022003

Authors
Ahrens, J Altieri, S Annand, JRM Anton, G Arends, HJ Aulenbacher, K Beck, R Bradtke, C Braghieri, A Degrande, N d'Hose, N Dutz, H Goertz, S Grabmayr, P Hansen, K Harmsen, J von Harrach, D Hasegawa, S Hasegawa, T Heid, E Helbing, K Holvoet, H Van Hoorebeke, L Horikawa, N Iwata, T Jennewein, P Kageya, T Kiel, B Klein, F Kondratiev, R Kossert, K Krimmer, J Lang, M Lannoy, B Leukel, R Lisin, V Matsuda, T McGeorge, JC Meier, A Menze, D Meyer, W Michel, T Naumann, J Owens, RO Panzeri, A Pedroni, P Pinelli, T Preobrajenski, I Radtke, E Reichert, E Reicherz, G Rohlof, C Ryckbosch, D Sadiq, F Sauer, M Schoch, B Schumacher, M Seitz, B Speckner, T Steigerwald, M Takabayashi, N Tamas, G Thomas, A van de Vyver, R Wakai, A Weihofen, W Wissmann, F Zapadtka, F Zeitler, G
Citation
J. Ahrens et al., First measurement of the Gerasimov-Drell-Hearn integral for H-1 from 200 to 800 MeV - art. no. 022003, PHYS REV L, 8702(2), 2001, pp. 2003-NIL_23
Citations number
38
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
8702
Issue
2
Year of publication
2001
Pages
2003 - NIL_23
Database
ISI
SICI code
0031-9007(20010709)8702:2<2003:FMOTGI>2.0.ZU;2-L
Abstract
A direct measurement of the helicity dependence of the total photoabsorptio n cross section an the proton was carried out at MAMI (Mainz) in the energy range 200 < E-<gamma> < 800 MeV. The experiment used a 4<pi> detection sys tem, a circularly polarized. tagged photon beam, and a frozen spin target. The contributions to the Gerasimov-Drell-Hearn sum rule and to the forward spin polarizability gamma (0) determined from the data are 226 +/- 5(stat) +/- 12(syst) mub and -187 +/- 8(stat) +/- 10(syst) x 10(-6) fm(4), respecti vely, for 200 < E-<gamma> < 800 MeV.