Measurement of the helicity-dependent total cross-section for the n p reaction

J. Ahrens; S. Altieri; J.R.M. Annand; H.-J. Arends; R. Beck; M.A. Blackston; C. Bradtke; A. Braghieri; N. d’Hose; H. Dutz; A. Fix; E. Heid; O. Jahn; F. Klein; R. Kondratiev; M. Lang; V. Lisin; M. Martinez-Fabregate; J.C. McGeorge; W. Meyer; A. Panzeri; P. Pedroni; T. Pinelli; D. Protopopescu; G. Reicherz; Ch. Rohlof; G. Rosner; T. Rostomyan; D. Ryckbosch; G. Tamas; A. Thomas; H.R. Weller

doi:10.1140/epja/i2011-11036-1

EPJ

Measurement of the helicity-dependent total cross-section for the

reaction

GDH and A2 Collaborations
J. Ahrens⁷, S. Altieri⁹^,10, J.R.M. Annand⁶, H.-J. Arends⁷, R. Beck⁷, M.A. Blackston³, C. Bradtke², A. Braghieri⁹, N. d’Hose⁵, H. Dutz², A. Fix¹¹, E. Heid⁷, O. Jahn⁷, F. Klein², R. Kondratiev⁸, M. Lang⁷, V. Lisin⁸, M. Martinez-Fabregate⁷, J.C. McGeorge⁶, W. Meyer¹, A. Panzeri⁹^,10, P. Pedroni⁹^*, T. Pinelli⁹^,10, D. Protopopescu⁶, G. Reicherz¹, Ch. Rohlof², G. Rosner⁶, T. Rostomyan⁴^,9, D. Ryckbosch⁴, G. Tamas⁷, A. Thomas⁷ and H.R. Weller³

¹ Insitut für Experimentalphysik, Ruhr-Universität Bochum, D-44801, Bochum, Germany
² Physikalisches Institut, Universität Bonn, D-53115, Bonn, Germany
³ Department of Physics, Duke University, 27708, Durham, NC, USA
⁴ Subatomaire en Stralingsfysica, Universiteit Gent, B-9000, Gent, Belgium
⁵ CEA Saclay, DSM/DAPNIA/SPhN, F-91191, Gif-sur-Yvette Cedex, France
⁶ SUPA, School of Physics and Astronomy, University of Glasgow, G12 8QQ, Glasgow, UK
⁷ Institut für Kernphysik, Universität Mainz, D-55099, Mainz, Germany
⁸ INR, Academy of Science, Moscow, Russia
⁹ INFN, Sezione di Pavia, I-27100, Pavia, Italy
¹⁰ Dipartimento di Fisica Nucleare e Teorica, Università di Pavia, I-27100, Pavia, Italy
¹¹ Laboratory of Mathematical Physics, Tomsk Polytechnic University, 634050, Tomsk, Russia

Received: 2 December 2010
Accepted: 4 February 2011
Published online: 14 March 2011

Abstract

The helicity dependence of the total cross-section for the

reaction has been measured for the first time at incident photon energies from 450 to 800MeV. The measurement was performed with the large-acceptance detector DAPHNE at the tagged photon beam facility of the MAMI accelerator in Mainz. Both the measured unpolarized and the helicity-dependent observables are not well described by the existing theoretical models.

Winter Workshop on Complex Systems
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EPJ

Measurement of the helicity-dependent total cross-section for the n p reaction

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