Table of Contents
Physics Research International
Volume 2011 (2011), Article ID 128429, 12 pages
Review Article

Neutron Production in Thick Targets Irradiated with High-Energy Ions

1Institute of Nuclear Science, School of Physics, University of Sydney, Sydney, NSW 2006, Australia
2Physics Department, Aristotle University, 54124 Thessaloniki, Greece
3Joint Institute for Nuclear Research, 141980 Dubna, Russia
4Fachbereich Chemie, Philipps Universität, 35032 Marburg, Germany
5Institut für Materialwissenschaften, Technische Universität Darmstadt, 64287 Darmstadt, Germany
6Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
7Dr. Westmeier GmbH, 35085 Ebsdorfergrund, Germany

Received 18 April 2011; Accepted 12 July 2011

Academic Editor: Ali Hussain Reshak

Copyright © 2011 S. R. Hashemi-Nezhad et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The neutron production in thick targets irradiated with 1 GeV protons was studied experimentally, and results are well understood with model calculations, including MCNPX 2.7a. However, one observes very large neutron production rates in the interaction of 44 GeV 12C onto thick Cu-, Pb-, and U-targets beyond calculated rates. The experimental spallation product yield curve in a 20 cm thick Cu target irradiated with 72 GeV 40Ar also cannot be reproduced by several model codes, including MCNPX 2.7a. This may be due to secondary fragments produced in high energy ( 𝐸 k i n e t i c > 1 0  GeV) heavy-ion interactions which destroy target nuclei more effectively than primary ions. These observed experimental facts constitute “unresolved problems” from a fundamental point of view. It may have an impact on radiation protection issues for future heavy-ion accelerators.