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Study of pre-equilibrium emission of light complex particles from Fe and Bi induced by intermediate energy neutrons
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Tillämpad kärnfysik. (Neutron Reaction Research)
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Tillämpad kärnfysik.
Vise andre og tillknytning
2011 (engelsk)Inngår i: International Nuclear Physics Conference 2010: Nuclear Reactions, 2011, s. 082013-Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

We have measured double differential cross sections (DDX) for emission of hydrogen- and helium-isotopes in the interaction of 175 MeV quasi-monoenergetic neutrons with Fe and Bi using the Medley setup at the The Svedberg Laboratory (Uppsala, Sweden). We compared experimental DDX with calculations with the TALYS code, which includes exciton model and Kalbach systematics; the code fails to reproduce the emission of complex light-ions, generally overestimating it. We propose an correction for the application of the Kalbach phenomenological model in the TALYS code by introducing a new energy dependence for the nucleon transfer mechanism in the pre-equilibrium emission region. Our results suggest also evidence for multiple pre-equilibrium emission of composite particles at 175 MeV.

 

sted, utgiver, år, opplag, sider
2011. s. 082013-
Serie
Journal of Physics: Conference Series, ISSN 1742-6588 ; 312
HSV kategori
Identifikatorer
URN: urn:nbn:se:uu:diva-150629DOI: 10.1088/1742-6596/312/8/082013ISI: 000299413400013OAI: oai:DiVA.org:uu-150629DiVA, id: diva2:408039
Konferanse
International Nuclear Physics Conference (INPC) JUL 04-09, 2010 Vancouver, CANADA
Tilgjengelig fra: 2011-04-02 Laget: 2011-04-02 Sist oppdatert: 2016-04-29
Inngår i avhandling
1. Neutron-Induced Light-Ion Production from Iron and Bismuth at 175 MeV
Åpne denne publikasjonen i ny fane eller vindu >>Neutron-Induced Light-Ion Production from Iron and Bismuth at 175 MeV
2011 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Radioactive waste management is one of the key issues in sustainability of nuclear energy production. Geological repositories represent today the most appropriate solution to long-term management of high-level radioactive waste. Strategies such as Partitioning and Transmutation of spent nuclear fuel may offer a positive impact on geological repositories, by reducing the mass of transuranium elements to be disposed and the time scale for their radiotoxicity. In this scenario, Accelerator Driven Systems (ADS) may play a relevant role as dedicated burners towards sustainable nuclear energy.

The NEXT project at Uppsala University contributes to a European effort to improve nuclear data knowledge for transmutation, providing the first experimental neutron induced data in the 100 to 200 MeV energy region. This thesis presents measurements of double-differential cross sections for production of light-ions in the interaction of 175 MeV quasi-monoenergetic neutrons with Fe and Bi. Results are compared with model calculations obtained with state-of-the-art nuclear reaction codes; TALYS-1.2, a modified version of JQMD, and MCNP6. Special focus in this work is given to pre-equilibrium emission of composite light-ions. A new energy dependence in the mechanisms described by the Kalbach systematics used in TALYS to account for composite particle emission in the pre-equilibrium stage is proposed. Data show also the need to include multiple pre-equilibrium emission of composite particles, a mechanism now included in TALYS only for protons and neutrons. The JQMD code was recently modified to include a surface coalescence model in the quantum molecular dynamics description of the formation of composite particles. Comparisons of the measured data with results from this modified JQMD code confirm the importance of coalescence mechanisms for the description of the emission spectra of composite particles. Finally, the neutron-induced data are compared with MCNP6 calculations, to contribute to the process of validation and verification of the code.

sted, utgiver, år, opplag, sider
Uppsala: Acta Universitatis Upsaliensis, 2011. s. 98
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 817
HSV kategori
Identifikatorer
urn:nbn:se:uu:diva-149999 (URN)978-91-554-8052-3 (ISBN)
Disputas
2011-05-19, Polhemsalen, Ångström Laboratory, Lägerhyddsvägen 1, Uppsala, 10:15 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2011-04-28 Laget: 2011-03-24 Sist oppdatert: 2011-05-04bibliografisk kontrollert

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