Measurement of helicity-dependent photoabsorption cross sections on the neutron from 815 to 1825 MeV

ISSN
1079-7114
0031-9007
Date Issued
2005
Author(s)
Dutz, H.
Helbing, Krister
Krimmer, J.
Speckner, T.
Zeitler, G.
Ahrens, J.
Altieri, S.
Annand, JRM
Anton, G.
Arends, H. J.
Beck, R.
Bock, A.
Bradtke, C.
Braghieri, A.
von 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, Werner
Michel, Tanja Maria
Naumann, J.
Panzeri, A.
Pedroni, P.
Pinelli, T.
Preobrajenski, I.
Radtke, E.
Reicherz, G.
Rohlof, C.
Rostomyan, T.
Schoch, B.
Schumacher, M.
Tamas, Gabor
Thomas, Andy
van de Vyver, R.
Weihofen, W.
Zapadtka, F.
DOI
10.1103/PhysRevLett.94.162001
Abstract
Helicity-dependent total photoabsorption cross sections on the deuteron have been measured for the first time at ELSA (Bonn) in the photon energy range from 815 to 1825 MeV. Circularly polarized tagged photons impinging on a longitudinally polarized LiD target have been used together with a highly efficient 4 pi detector system. The data around 1 GeV are not compatible with predictions from existing multipole analyses. From the measured energy range an experimental contribution to the GDH integral on the neutron of [33.9 +/- 5.5(stat)+/- 4.5(syst)] mu b is extracted.