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Neutron Production in Thick Targets Irradiated with High-Energy Ions

Hashemi-Nezhad, S. R. and Zamani-Valasiadou, M. and Krivopustov, M. I. and Brandt, R. and Ensinger, Wolfgang and Odoj, R. and Westmeier, W. (2011):
Neutron Production in Thick Targets Irradiated with High-Energy Ions.
In: Physics Research International, Hindawi Publishing Corporation, p. 128429, 2011, [Online-Edition: http://dx.doi.org/10.1155/2011/128429],
[Article]

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 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 (Ekinetic > 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.

Item Type: Article
Erschienen: 2011
Creators: Hashemi-Nezhad, S. R. and Zamani-Valasiadou, M. and Krivopustov, M. I. and Brandt, R. and Ensinger, Wolfgang and Odoj, R. and Westmeier, W.
Title: Neutron Production in Thick Targets Irradiated with High-Energy Ions
Language: English
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 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 (Ekinetic > 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.

Journal or Publication Title: Physics Research International
Volume: 2011
Publisher: Hindawi Publishing Corporation
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Material Analytics
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 18 Nov 2011 14:22
Official URL: http://dx.doi.org/10.1155/2011/128429
Funders: Considerable part of the work was made in the framework of an International Collaboration (GAMMA-2, Energy plus Transmutation) experimenting at the Nuclotron accelerator in JINR (Dubna, Russia).
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