Neutron Production in Thick Targets Irradiated with High-Energy Ions. (3rd October 2011)

• Record Type: Journal Article
• Authors: Hashemi-Nezhad, S. R.; Zamani-Valasiadou, M.; Krivopustov, M. I.; Brandt, R.; Ensinger, W.; Odoj, R.; Westmeier, W.
• Other Names: Reshak Ali Hussain Academic Editor.
• Is Part Of: Physics research international. Volume 2011(2011)
• Publication Date: 2011-10-03
• Subjects: Physics -- Periodicals; Physics; Periodicals; Electronic journals; 530
• DOI: 10.1155/2011/128429
• Languages: English
• ISSNs: 2090-2220

Abstract

Abstract : 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 12 C 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 40 Ar also cannot be reproduced by several model codes, including MCNPX 2.7a. This may be due to secondary fragments produced in high energy (E kinetic > 10 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.