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95 MeV neutron scattering on hydrogen, deuterium, carbon and oxygen
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Neutron Research.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Neutron Research.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Neutron Research.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Neutron Research.
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2006 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 74, no 5, 054002- p.Article in journal (Refereed) Published
Abstract [en]

Three neutron-deuteron scattering experiments at 95 MeV have been performed recently at The Svedberg Laboratory in Uppsala. Subsets of the results of these experiments have been reported in two short articles, showing clear evidence for three-nucleon force effects. In this paper, we present a more detailed description of the experimental methods as well as further discussion of the results. In addition to neutron-deuteron scattering data, neutron-proton and C12(n,n) elastic scattering data have been measured for normalization purposes, and O16(n,n) data have been obtained for the first time at this energy. It was possible to extract C12(n,n') and O16(n,n') inelastic scattering cross sections to excited states below 12 MeV excitation energy. The inelastic scattering data (for both carbon and oxygen) are shown to have a significant impact on the determination of nuclear recoil kerma coefficients.

Place, publisher, year, edition, pages
2006. Vol. 74, no 5, 054002- p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-96692DOI: 10.1103/PhysRevC.74.054002ISI: 000242409500008OAI: oai:DiVA.org:uu-96692DiVA: diva2:171350
Available from: 2008-02-08 Created: 2008-02-08 Last updated: 2013-02-18
In thesis
1. Neutron Scattering at 96 MeV
Open this publication in new window or tab >>Neutron Scattering at 96 MeV
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Data on elastic scattering of 96 MeV neutrons from 56Fe, 89Y and 208Pb in the angular interval 10-70° are presented. The previously published data on 208Pb have been extended, as a new method has been developed to obtain additional information at the most forward angles. The results are compared with phenomenological and microscopic optical potentials. The theory predictions are in general in good agreement with the experimental data.

A study of the deviation of the zero-degree cross section from Wick's limit has been performed. The data on 208Pb are in agreement with Wick's limit, while those on lighter nuclei overshoot the limit significantly.

A novel analysis method has been developed to obtain the inelastic neutron emission cross sections from the existing 56Fe data. The method is based on folding a trial spectrum with the response of the detector setup. The data cover the angular interval 26-65° and an excitation energy range of 0-45 MeV, ranges hitherto not studied. The results are compared with nuclear model predictions and found to be in good agreement with the experimental data.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2008. 52 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 389
Keyword
Nuclear physics, neutron, elastic scattering, inelastic scattering, differential cross section, optical model potential, Wick's limit, angular distribution, pre-equilibrium, Kärnfysik
National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-8425 (URN)978-91-554-7079-1 (ISBN)
Public defence
2008-02-29, Häggsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 10:15 (English)
Opponent
Supervisors
Available from: 2008-02-08 Created: 2008-02-08 Last updated: 2009-04-29Bibliographically approved
2. Neutron-Deuteron Scattering and Three-Body Interactions
Open this publication in new window or tab >>Neutron-Deuteron Scattering and Three-Body Interactions
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
Alternative title[sv]
Neutron-Deuteronspridning och Trekropparväxelverkan
Abstract [en]

High-precision differential cross section data of the neutron-deuteron elastic scattering reaction at 95 MeV are presented. The neutron-proton scattering differential cross section was also measured and used as a reference to allow an accurate absolute normalization of the neutron-deuteron data.

Two multi-detector arrays were used, MEDLEY and SCANDAL, at the neutron beam facility at The Svedberg Laboratory in Uppsala. Three different configurations of the detectors allowed to perform three independent measurements. The first experiment involved detecting recoil deuterons from thin deuterated polyethylene targets with the MEDLEY setup and allowed a large angular coverage. In the second experiment, high-precision data were obtained at neutron backward angles, using the SCANDAL setup with the same technique. For the third experiment, data were obtained in the forward angular range using the SCANDAL setup with a technique where neutrons scattered on heavy water were detected by neutron-proton conversion in plastic scintillators and tracking the protons through the detectors. Events from elastic neutron-deuteron scattering were identified in the data analysis, and differential cross sections were obtained after applying corrections and evaluating systematic uncertainties due to effects which could affect the shape or the absolute normalization of the data.

The results are compared with modern Faddeev calculations using realistic nucleon-nucleon potentials combined with three-nucleon interactions. The effects of three-nucleon forces are expected to increase the differential cross section by about 30% in the region of the minimum. The data agree with this prediction, thus providing evidence for three-nucleon force effects.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2006. vii + 42 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 163
Keyword
Nuclear physics, three-body force, neutron, deuteron, elastic scattering, angular distribution, Faddeev equations, Kärnfysik
Identifiers
urn:nbn:se:uu:diva-6739 (URN)91-554-6514-5 (ISBN)
Public defence
2006-05-24, Häggsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:15
Opponent
Supervisors
Available from: 2006-04-28 Created: 2006-04-28 Last updated: 2012-04-11Bibliographically approved

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Johansson, CeciliaPomp, Stephan

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