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SCANDAL - A facility for elastic neutron scattering studies in the 50--130 MeV range
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Neutron Research.
Uppsala University, The Svedberg Laboratory.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
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2002 (English)In: Nucl. Instr. Meth., Vol. A, no 489, 282- p.Article in journal (Refereed) Published
Place, publisher, year, edition, pages
2002. Vol. A, no 489, 282- p.
Identifiers
URN: urn:nbn:se:uu:diva-45213OAI: oai:DiVA.org:uu-45213DiVA: diva2:73120
Available from: 2008-10-17 Created: 2008-10-17 Last updated: 2013-02-18
In thesis
1. High-sensitivity Radioactive Xenon Monitoring and High-accuracy Neutron-proton Scattering Measurements
Open this publication in new window or tab >>High-sensitivity Radioactive Xenon Monitoring and High-accuracy Neutron-proton Scattering Measurements
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Two aspects of applied nuclear physics have been studied in this thesis; Monte Carlo simulations for high-sensitivity monitoring of radioactive xenon and high-accuracy neutron-proton scattering measurements for neutron physics applications and fundamental physics.

The Monte Carlo simulations have been performed for two systems for detection of radioactive xenon, using the MCNP code. These systems, designed for monitoring of violations of the Comprehensive Nuclear-Test-Ban Treaty, are based on coincident detection of electrons and gamma rays, emitted in beta decay of xenon nuclides produced in nuclear weapons explosions. In general, the simulations describe test data well, and the deviations from experimental data are understood.

The neutron-proton scattering measurements have been performed by measuring the differential np scattering cross section at 96 MeV in the angular range θc.m.= 20° – 76°. Together with an earlier data set at the same energy, covering the angles θc.m.= 74° – 180°, a new data set has been formed in the angular range θc.m.= 20° – 180°. This extended data set has been normalised to the experimental total np cross section, resulting in a renormalisation of the earlier data of 0.7 %, which is well within the stated normalisation uncertainty for that experiment. The results on forward np scattering are in reasonable agreement with theory models and partial wave analyses and have been compared with data from the literature.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2004. 59 p.
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 984
Keyword
Nuclear physics, Monte Carlo simulations, MCNP, xenon detection, detector response, neutron detection, elastic scattering, differential cross section, Kärnfysik
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-4279 (URN)91-554-5979-X (ISBN)
Public defence
2004-06-04, Polhemsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:15
Opponent
Supervisors
Available from: 2004-05-11 Created: 2004-05-11 Last updated: 2012-04-11Bibliographically approved
2. Elastic Neutron Scattering at 96 MeV
Open this publication in new window or tab >>Elastic Neutron Scattering at 96 MeV
2003 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

A facility for studies of elastic neutron scattering in the 50–130 MeV range has been developed. In addition to elastic neutron scattering, it has been used for (n,p) and (n,d) reaction experiments. The performance of the device has been illustrated in measurements of the (n,p) and (n,n) cross sections on 1H and 12C.

Elastic neutron scattering from 12C and 208Pb has been studied at 96 MeV in the 10–70 degree interval. The achieved energy resolution, 3.7 MeV, is about one order of magnitude better than for any previous experiment above 65 MeV incident energy. The present experiment represents the highest neutron energy where the ground state has been resolved from the first excited state in neutron scattering. A novel method for normalization of the absolute scale of the cross section has been used. The estimated normalization uncertainty, 3 %, is unprecedented for a neutron-induced differential cross section measurement on a nuclear target.

The results are compared with modern optical model predictions, based on phenomenology or microscopic nuclear theory. The data on 208Pb are in general in good agreement with the theory models.

All theory models fail to describe the 12C data in the 30–50 degree interval, where the models predict a saddle structure not displayed by the present experimental data. Various reasons for this discrepancy have been investigated. For the other parts of the angular range studied, the agreement is good.

These measurements have to a large degree been motivated by needs in various application areas, i.e., nuclear waste incineration by fast neutrons and biomedical effects caused by neutrons. The implications of the present results on these applications are discussed.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2003. vi, 50 p.
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 854
Keyword
Nuclear physics, neutron, detection, CsI, elastic scattering, differential cross section, optical potential, kerma, Kärnfysik
National Category
Subatomic Physics
Research subject
Applied Nuclear Physics
Identifiers
urn:nbn:se:uu:diva-3453 (URN)91-554-5663-4 (ISBN)
Public defence
2003-06-06, Polhemsalen, Ångströmlaboratoriet, Uppsala, 13:15
Opponent
Supervisors
Available from: 2003-05-14 Created: 2003-05-14 Last updated: 2012-04-11Bibliographically approved

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