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Neutron Scattering at 96 MeV
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
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 [en]
Nuclear physics, neutron, elastic scattering, inelastic scattering, differential cross section, optical model potential, Wick's limit, angular distribution, pre-equilibrium
Keyword [sv]
Kärnfysik
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-8425ISBN: 978-91-554-7079-1 (print)OAI: oai:DiVA.org:uu-8425DiVA: diva2:171353
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
List of papers
1. Elastic neutron scattering at 96 MeV from 12C and 208Pb
Open this publication in new window or tab >>Elastic neutron scattering at 96 MeV from 12C and 208Pb
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2003 (English)In: Physical Review C, Vol. 68, 064605-064622 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-96691 (URN)
Available from: 2008-02-08 Created: 2008-02-08 Last updated: 2013-02-18
2. 95 MeV neutron scattering on hydrogen, deuterium, carbon and oxygen
Open this publication in new window or tab >>95 MeV neutron scattering on hydrogen, deuterium, carbon and oxygen
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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.

National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-96692 (URN)10.1103/PhysRevC.74.054002 (DOI)000242409500008 ()
Available from: 2008-02-08 Created: 2008-02-08 Last updated: 2013-02-18
3. Elastic scattering of 96 MeV neutrons from iron, yttrium, and lead
Open this publication in new window or tab >>Elastic scattering of 96 MeV neutrons from iron, yttrium, and lead
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2008 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 77, no 2, 024605- p.Article in journal (Refereed) Published
Abstract [en]

Data on elastic scattering of 96 MeV neutrons from Fe-56, Y-89, and Pb-208 in the angular interval 10-70 degrees are reported. The previously published data on Pb-208 have been extended, as a new method has been developed to obtain more information from data, namely to increase the number of angular bins at the most forward angles. A study of the deviation of the zero-degree cross section from Wick's limit has been performed. It was shown that the data on Pb-208 are in agreement with Wick's limit while those on the lighter nuclei overshoot the limit significantly. The results are compared with modern optical model predictions, based on phenomenology and microscopic nuclear theory. The data on Fe-56, Y-89, and Pb-208 are in general in good agreement with the model predictions.

National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-96693 (URN)10.1103/PhysRevC.77.024605 (DOI)000253764600035 ()
Available from: 2008-02-08 Created: 2008-02-08 Last updated: 2012-07-10Bibliographically approved
4. Inelastic neutron scattering cross sections at 96 MeV for iron
Open this publication in new window or tab >>Inelastic neutron scattering cross sections at 96 MeV for iron
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(English)Manuscript (Other (popular science, discussion, etc.))
Identifiers
urn:nbn:se:uu:diva-96694 (URN)
Available from: 2008-02-08 Created: 2008-02-08 Last updated: 2013-02-18

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