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Neutron-Induced Light-Ion Production from Iron and Bismuth at 175 MeV
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics. (Neutron Reaction Research)
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
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.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis , 2011. , 98 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 817
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-149999ISBN: 978-91-554-8052-3OAI: oai:DiVA.org:uu-149999DiVA: diva2:408040
Public defence
2011-05-19, Polhemsalen, Ångström Laboratory, Lägerhyddsvägen 1, Uppsala, 10:15 (English)
Opponent
Supervisors
Available from: 2011-04-28 Created: 2011-03-24 Last updated: 2011-05-04Bibliographically approved
List of papers
1. Medley spectrometer for ligh ions in neutron induced reactions at 175 MeV
Open this publication in new window or tab >>Medley spectrometer for ligh ions in neutron induced reactions at 175 MeV
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2011 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, Vol. 646, no 1, 100-107 p.Article in journal (Refereed) Published
Abstract [en]

We have upgraded the Medley spectrometer to measure neutron-induced double differential cross-sections for light-ion production, with neutron energies up to 175 MeV. Measurements were performed at the quasi-monoenergetic neutron beam line at the The Svedberg Laboratory, in Uppsala (Sweden). Medley is a spectrometer system composed of eight three-element telescope detectors; Delta E-E technique is used for particle identification and total kinetic energy measurement. We have improved particle separation and installed new detectors that fully stop ions with kinetic energy up to 170 MeV. To reduce the contribution of the low energy tail in the quasi-monoenergetic neutron spectrum, we have applied time-of-flight techniques and investigated the results for measurements with 175 MeV neutrons. We have investigated the response function of the CsI(Tl) scintillators and describe a method for efficiency correction. We have studied the signal-to-background ratio of the new configuration of the spectrometer and of the collimation system. A method to obtain absolute cross-section normalization, separating the peak neutrons from the low-energy tail, is proposed. Finally we have characterized the 175 MeV quasi-monoenergetic neutron spectrum with the Medley spectrometer. This upgraded configuration has been used in 2007 and 2009 for light-ion production measurements at 175 MeV from C, Si, O, Fe, Bi and U.

Keyword
Spectrometer, Light ions, Neutron induced reactions, Double differential cross-sections
National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-149998 (URN)10.1016/j.nima.2011.04.036 (DOI)000292713200010 ()
Available from: 2011-03-24 Created: 2011-03-24 Last updated: 2013-05-17Bibliographically approved
2. New neutron data measurements at 175 MeV for Accelerator Driven Systems
Open this publication in new window or tab >>New neutron data measurements at 175 MeV for Accelerator Driven Systems
2011 (English)In: Proceedings of the 2011 International Congress on Advances in Nuclear Power Plants: Performance & Flexibility: The Power of Innovation, 2011, 2828-2834 p.Conference paper (Refereed)
Abstract [en]

We have compared TALYS, MCNP6 and quantum molecular dynamics model calculations with preliminary light-ion production data in the interaction of 175 MeV quasi-monoenergetic neutrons with Fe and Bi. Data were measured with the Medley setup at the The Svedberg Laboratory, in Uppsala – Sweden. These are the first neutron induced light-ion production data available in the 100 to 200 MeV energy region; these data are relevant for the development of accelerator-driven system technologies, and are needed to ensure a link between high and low energy processes. Model calculations are consistent with some results, but at the moment no code is able to fully predict  all the experimental data. Our results show the need of further investigation of neutron-induced reactions in this energy region, in particular to study the production of composite light ions.

National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-149641 (URN)
Conference
International Congress on Advances in Nuclear Power Plants (ICAPP 2011)
Available from: 2011-03-21 Created: 2011-03-21 Last updated: 2013-09-25Bibliographically approved
3. Study of pre-equilibrium emission of light complex particles from Fe and Bi induced by intermediate energy neutrons
Open this publication in new window or tab >>Study of pre-equilibrium emission of light complex particles from Fe and Bi induced by intermediate energy neutrons
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2011 (English)In: International Nuclear Physics Conference 2010: Nuclear Reactions, 2011, 082013- p.Conference paper (Refereed)
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.

 

Series
, Journal of Physics: Conference Series, ISSN 1742-6588 ; 312
National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-150629 (URN)10.1088/1742-6596/312/8/082013 (DOI)000299413400013 ()
Conference
International Nuclear Physics Conference (INPC) JUL 04-09, 2010 Vancouver, CANADA
Available from: 2011-04-02 Created: 2011-04-02 Last updated: 2016-04-29
4. Exciton model and quantum molecular dynamics in inclusive nucleon-induced reactions
Open this publication in new window or tab >>Exciton model and quantum molecular dynamics in inclusive nucleon-induced reactions
2011 (English)In: Proceedings of the 2010 Symposium on Nuclear Data (SND-2010) / [ed] Japan Atomic Energy Agency, 2011Conference paper (Refereed)
Series
, JAEA-Conf report
National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-149629 (URN)
Conference
2010 Symposium on Nuclear Data
Available from: 2011-03-21 Created: 2011-03-21 Last updated: 2013-09-25Bibliographically approved
5. Light-ion production in 175 MeV neutron-induced reactions on oxygen
Open this publication in new window or tab >>Light-ion production in 175 MeV neutron-induced reactions on oxygen
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2011 (English)In: Journal of Korean Physical Society: Proceedings of the International Conference on Nuclear Data for Science and Technology 2010 / [ed] Korean Physical Society, 2011Conference paper (Refereed)
National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-149635 (URN)
Conference
International Conference on Nuclear Data for Science and Technology 2010 (ND2010)
Available from: 2011-03-21 Created: 2011-03-21 Last updated: 2016-04-29
6. Characterization of ANITA and QMN neutron beams at TSL using proton recoil techniques
Open this publication in new window or tab >>Characterization of ANITA and QMN neutron beams at TSL using proton recoil techniques
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2011 (English)In: Journal of Korean Physical Society: Proceedings of the International Conference on Nuclear Data for Science and Technology 2010 / [ed] Korean Physical Society, 2011Conference paper (Refereed)
National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-149636 (URN)
Conference
International Conference on Nuclear Data for Science and Technology 2010 (ND2010)
Available from: 2011-03-21 Created: 2011-03-21 Last updated: 2016-04-29

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