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HK: Physik der Hadronen und Kerne

HK 28: Instrumentation und Anwendungen IV

HK 28.2: Group Report

Tuesday, March 23, 1999, 17:00–17:30, F

Neutron (and Charged Particle) Production for GeV Proton-Nucleus Spallation Reactions — •F. Goldenbaum², M. Enke¹, D. Filges², J. Galin³, C.M. Herbach¹, D. Hilscher¹, U. Jahnke¹, A. Letourneau³, B. Lott³, R.D. Neef², K. Nünighoff², Y. Patois³, N. Paul², A. Peghaire³, L. Pienkowski⁴, H. Schaal², W.U. Schröder⁵, A. Tietze², and J. Töke⁵ — ¹Hahn-Meitner-Institut GmbH, 14109 Berlin, Germany — ²Forschungszentrum-Jülich GmbH, 52425 Jülich, Germany — ³Ganil (IN2P3-CNRS), BP 5027, F-14021 Caen-Cedex, France — ⁴University of Warsaw, 02-097 Warszawa, Poland — ⁵University of Rochester, NY, USA

Experiments with thin(mg/cm²) and thick (typically several cm in thickness and diameter) targets have been carried out at the proton accelerator COSY(Jülich) with incident proton energies from 0.4 to 2.5 GeV in order to study fundamental spallation reactions using neutron and charged particle detectors[1]. A variety of target materials—Hg (presently most favoured for ESS), W and Pb (provided as reflector material), different target geometries and beam energies have been investigated serving as an important benchmark for optaining key parameters neccessary to design the European Spallation Source(ESS)[2]. Typical observables of interest are

• mean number of emitted particles (but also neutron and charged particle multiplicity distributions)
• mean number of neutrons and charged particles per incident proton
• reaction and production cross sections

The aim of our experimental program is the eventwise measurement of all emitted reaction products for thin targets and of neutrons for thick targets providing a means to validate codes describing intra- and inter-nuclear processes, respectively. The comparison of experimental data with the results of the high energy transport code HERMES[3] will be shown.

[1] D. Hilscher et al. NIM A 414, 100(1998)

[2] ESS-Report, ESS-96-53-M Volume III, ISBN: 0902376659, (1996)

[3] P.Cloth et al.,HERMES, A Monte Carlo Program System for Beam-Materials Interaction Studies, Report Jülich 2203(1988)